fix(tools): keep searching past broken Python aliases

fix(tools): find Python on Windows without python3.exe
Installing debugpy on Windows failed with "cannot run python3.exe … (os error 3)": the tool manager looked for `python3` first, and on Windows that only finds the App Execution Alias in WindowsApps, which can't start without the Store's Python. Windows installs `python.exe` and the `py` launcher instead. On Windows the interpreter is now looked up as `python`, `py`, then `python3`, and a WindowsApps alias only counts when it runs. The debugpy adapter's default interpreter is `python` on Windows too. macOS and Linux keep `python3` first.
2026-11-07 18:38:33 -10:00 · 2026-11-05 10:59:36 +08:00 · 2026-11-05 10:30:03 +08:00 · 2026-11-05 10:28:21 +08:00 · 2026-11-05 10:24:43 +08:00 · 2026-11-05 10:06:18 +08:00
577 changed files with 43003 additions and 3346 deletions
@@ -1,4 +1,4 @@
-Closes #
+<!-- If this resolves an issue: Closes #<n> -->

 ## What and why

@@ -15,6 +15,8 @@ concurrency:
 env:
  CARGO_TERM_COLOR: always
  CARGO_INCREMENTAL: 0
+  # Line tables keep test backtraces readable; full debuginfo only adds build time and cache size.
+  CARGO_PROFILE_DEV_DEBUG: line-tables-only

 jobs:
  rust:
@@ -25,10 +27,10 @@ jobs:
        os: [macos-latest, ubuntu-22.04, windows-latest]
    runs-on: ${{ matrix.os }}
    steps:
-      - uses: actions/checkout@v4
-      - uses: pnpm/action-setup@v4
+      - uses: actions/checkout@v5
+      - uses: pnpm/action-setup@v5
        with: { version: 11 }
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v5
        with: { node-version: 22, cache: pnpm }
      - uses: dtolnay/rust-toolchain@stable
        with: { components: "clippy, rustfmt" }
@@ -62,7 +64,7 @@ jobs:
    name: Remote server (linux musl)
    runs-on: ubuntu-22.04
    steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
      - uses: dtolnay/rust-toolchain@stable
        with: { targets: x86_64-unknown-linux-musl }
      - uses: Swatinem/rust-cache@v2
@@ -79,7 +81,7 @@ jobs:
    env:
      CARGO_TARGET_DIR: ${{ github.workspace }}/target-plugins
    steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
      - uses: dtolnay/rust-toolchain@stable
        with: { targets: wasm32-wasip2, components: "clippy, rustfmt" }
      - uses: Swatinem/rust-cache@v2
@@ -100,9 +102,9 @@ jobs:
            cargo test --locked --manifest-path "$dir/Cargo.toml"
            echo "::endgroup::"
          done
-      - uses: pnpm/action-setup@v4
+      - uses: pnpm/action-setup@v5
        with: { version: 11 }
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v5
        with: { node-version: 22 }
      # Plugin web pages (`web-src/`, their own pnpm projects): typecheck and test.
      - name: Web pages typecheck and test
@@ -126,7 +128,7 @@ jobs:
    name: Cargo deny
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
      - uses: dtolnay/rust-toolchain@stable
      - uses: taiki-e/install-action@cargo-deny
      - run: cargo deny check
@@ -135,10 +137,10 @@ jobs:
    name: Frontend
    runs-on: ubuntu-22.04
    steps:
-      - uses: actions/checkout@v4
-      - uses: pnpm/action-setup@v4
+      - uses: actions/checkout@v5
+      - uses: pnpm/action-setup@v5
        with: { version: 11 }
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v5
        with: { node-version: 22, cache: pnpm }
      - run: pnpm install --frozen-lockfile
      - run: pnpm typecheck
@@ -154,16 +156,16 @@ jobs:
    # Browsers and their system libraries are preinstalled; keep the tag in step with @playwright/test.
    container: mcr.microsoft.com/playwright:v1.64.1-noble
    steps:
-      - uses: actions/checkout@v4
-      - uses: pnpm/action-setup@v4
+      - uses: actions/checkout@v5
+      - uses: pnpm/action-setup@v5
        with: { version: 11 }
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v5
        with: { node-version: 22, cache: pnpm }
      - run: pnpm install --frozen-lockfile
      - run: pnpm e2e
        env:
          HOME: /root
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v6
        if: failure()
        with:
          name: playwright-report
@@ -0,0 +1,124 @@
+name: Language smoke
+# Everyday code intelligence (completion, go to definition, Find Usages, hover, diagnostics
+# with a quick fix, an intention, formatting, rename) per language, against the language
+# server the app starts by default: crates/ide-host/tests/language_smoke.rs.
+# Opening the fixture with its build tool and SDK (Maven / Gradle sync, the virtualenv, the
+# JDK): the ignored tests of crates/ide-host/tests/project_smoke.rs.
+# Then running and testing each fixture through the run store and openidea-server
+# (Run, Run tests, the test tree, Rerun Failed Tests): smoke/run.test.ts; and debugging its
+# entry point with the debugger the IDE installs (breakpoint, frames, variables, evaluate,
+# Step Over, Resume): smoke/debug.test.ts.
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+    types: [opened, synchronize, reopened]
+    paths:
+      - "crates/**"
+      - "languages/**"
+      - "fixtures/**"
+      - "Cargo.toml"
+      - "Cargo.lock"
+      - "src/features/run/**"
+      - "src/features/debugger/**"
+      - "src/platform/**"
+      - "smoke/**"
+      - "package.json"
+      - "pnpm-lock.yaml"
+      - ".github/workflows/language-smoke.yml"
+  workflow_dispatch:
+
+concurrency:
+  group: language-smoke-${{ github.ref }}
+  # A new push supersedes a PR's run; on main every merge runs to the end (and saves the cache).
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
+env:
+  CARGO_TERM_COLOR: always
+  CARGO_INCREMENTAL: 0
+  # Pinned so a server release can't fail an unrelated PR; bump them deliberately.
+  VTSLS: 0.3.0
+  TYPESCRIPT: 6.0.3
+  BASEDPYRIGHT: 1.40.2
+  RUFF: 0.17.3
+  GOPLS: v0.24.0
+  JDTLS: 1.63.0-202610191322
+  KOTLIN_LSP: 263.7084.0
+  GRADLE: 8.14.3
+
+jobs:
+  smoke:
+    name: Language smoke (${{ matrix.language }})
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [typescript, python, rust, go, java, kotlin]
+    runs-on: ubuntu-22.04
+    timeout-minutes: 40
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with: { components: "rust-analyzer, rustfmt" }
+      # One build cache for every language; main saves it.
+      - uses: Swatinem/rust-cache@v2
+        with:
+          shared-key: language-smoke
+          save-if: ${{ github.ref == 'refs/heads/main' && matrix.language == 'rust' }}
+
+      - uses: pnpm/action-setup@v4
+        with: { version: 11 }
+      - uses: actions/setup-node@v4
+        with: { node-version: 22, cache: pnpm }
+      - if: matrix.language == 'typescript'
+        run: npm install --global "@vtsls/language-server@$VTSLS" "typescript@$TYPESCRIPT"
+
+      - if: matrix.language == 'python'
+        uses: actions/setup-python@v5
+        with: { python-version: "3.12" }
+      - if: matrix.language == 'python'
+        run: pip install "basedpyright==$BASEDPYRIGHT" "ruff==$RUFF"
+
+      - if: matrix.language == 'go'
+        uses: actions/setup-go@v5
+        with: { go-version: "1.27", cache: false }
+      - if: matrix.language == 'go'
+        run: go install "golang.org/x/tools/gopls@$GOPLS"
+
+      - if: matrix.language == 'java' || matrix.language == 'kotlin'
+        uses: actions/setup-java@v4
+        with: { distribution: temurin, java-version: "21" }
+      - if: matrix.language == 'java'
+        run: |
+          mkdir -p "$RUNNER_TEMP/jdtls"
+          curl -fsSL "https://download.eclipse.org/jdtls/milestones/${JDTLS%-*}/jdt-language-server-$JDTLS.tar.gz" \
+            | tar xz -C "$RUNNER_TEMP/jdtls"
+          echo "$RUNNER_TEMP/jdtls/bin" >> "$GITHUB_PATH"
+
+      # The Kotlin fixture has no Gradle wrapper: the server imports it with the Gradle on PATH.
+      - if: matrix.language == 'kotlin'
+        uses: gradle/actions/setup-gradle@v4
+        with: { gradle-version: "${{ env.GRADLE }}" }
+      - if: matrix.language == 'kotlin'
+        run: |
+          mkdir -p "$RUNNER_TEMP/kotlin-lsp" "$RUNNER_TEMP/bin"
+          curl -fsSL "https://download.jetbrains.com/language-server/kotlin-server/$KOTLIN_LSP/kotlin-server-$KOTLIN_LSP.tar.gz" \
+            | tar xz -C "$RUNNER_TEMP/kotlin-lsp" --strip-components=1
+          ln -s "$RUNNER_TEMP/kotlin-lsp/kotlin-lsp.sh" "$RUNNER_TEMP/bin/kotlin-lsp"
+          echo "$RUNNER_TEMP/bin" >> "$GITHUB_PATH"
+
+      - run: cargo test --locked -p ide-host --test language_smoke --no-run
+      - run: cargo test --locked -p ide-host --test language_smoke -- --ignored --exact ${{ matrix.language }}
+      - if: matrix.language == 'java'
+        run: cargo test --locked -p ide-host --test project_smoke -- --ignored --exact maven_sync jdk
+      - if: matrix.language == 'kotlin'
+        run: cargo test --locked -p ide-host --test project_smoke -- --ignored --exact gradle_sync
+      - if: matrix.language == 'python'
+        run: cargo test --locked -p ide-host --test project_smoke -- --ignored --exact python_venv
+
+      - run: pnpm install --frozen-lockfile
+      - run: cargo build --locked -p ide-host --bin openidea-server
+      - run: pnpm smoke smoke/run.test.ts -t "^${{ matrix.language }}$"
+      - run: pnpm smoke smoke/debug.test.ts -t "^${{ matrix.language }}$"
+        # The IDE installs the debugger from GitHub releases: authenticated, against rate limits.
+        env: { GITHUB_TOKEN: "${{ github.token }}" }
@@ -0,0 +1,46 @@
+name: Plugin index
+
+# Refreshes the community plugins in the latest release's plugins-index.json
+# (what released apps read) from the registry, l0ng-ai/openidea-plugins. The
+# official plugins, their key and revocations stay as the release wrote them.
+on:
+  schedule:
+    - cron: "17 * * * *"
+  workflow_dispatch:
+  # Sent by the registry when its index changes.
+  repository_dispatch:
+    types: [community-plugins]
+
+permissions:
+  contents: write
+
+concurrency:
+  group: plugins-index
+
+env:
+  COMMUNITY_PLUGINS_INDEX: https://github.com/l0ng-ai/openidea-plugins/releases/download/index/index.json
+
+jobs:
+  merge:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Merge the community index
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          set -euo pipefail
+          cd "$RUNNER_TEMP"
+          tag="$(gh release view --repo "$GITHUB_REPOSITORY" --json tagName -q .tagName)"
+          tool=openidea-plugin-linux-x86_64
+          if ! gh release download "$tag" --repo "$GITHUB_REPOSITORY" -p plugins-index.json -p "$tool.gz"; then
+            echo "::notice::$tag has no plugin index or openidea-plugin tool yet"
+            exit 0
+          fi
+          gunzip "$tool.gz" && chmod +x "$tool"
+          cp plugins-index.json before.json
+          "./$tool" merge plugins-index.json "$COMMUNITY_PLUGINS_INDEX" --keep openidea
+          if cmp -s before.json plugins-index.json; then
+            echo "unchanged"
+          else
+            gh release upload "$tag" plugins-index.json --repo "$GITHUB_REPOSITORY" --clobber
+          fi
@@ -18,24 +18,15 @@ jobs:
    if: github.event.pull_request.user.type != 'Bot' && !github.event.pull_request.draft
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/github-script@v7
+      - uses: actions/github-script@v8
        with:
          script: |
            const pr = context.payload.pull_request;
            const LABEL = 'needs-info';
            const MARKER = '<!-- pr-check -->';
-            // Docs, CI and pure refactors may skip the linked issue.
-            const NO_ISSUE_TYPES = /^(docs|ci|build|chore|refactor|style|test)(\(.+\))?!?:/;
-
            const body = (pr.body || '').replace(/<!--[\s\S]*?-->/g, '');
            const problems = [];

-            const linksIssue =
-              /\b(close[sd]?|fix(e[sd])?|resolve[sd]?)\s*:?\s+(#\d+|https:\/\/github\.com\/[\w.-]+\/[\w.-]+\/issues\/\d+)/i.test(body);
-            if (!linksIssue && !NO_ISSUE_TYPES.test(pr.title)) {
-              problems.push('Link the issue this PR resolves, e.g. `Closes #123`.');
-            }
-
            const verified = body.match(/^##+\s*How it was verified\s*$([\s\S]*?)(?=^##+\s|(?![\s\S]))/im);
            if (!verified || !verified[1].trim()) {
              problems.push('Fill in **How it was verified**: the commands you ran and their results. UI changes need before/after screenshots.');
@@ -18,6 +18,7 @@ env:
  CARGO_TERM_COLOR: always
  CARGO_INCREMENTAL: 0
  TAG: ${{ github.event.inputs.tag || github.ref_name }}
+  COMMUNITY_PLUGINS_INDEX: https://github.com/l0ng-ai/openidea-plugins/releases/download/index/index.json

 jobs:
  # Creates (or reuses) one draft release that every platform build uploads into.
@@ -25,8 +26,9 @@ jobs:
    runs-on: ubuntu-latest
    outputs:
      release_id: ${{ steps.release.outputs.id }}
+      official_plugin_keys: ${{ steps.plugin-keys.outputs.keys }}
    steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
        with: { ref: "${{ env.TAG }}" }
      - name: Tag matches app version
        run: |
@@ -35,8 +37,22 @@ jobs:
            echo "::error::tag $TAG does not match tauri.conf.json version $app"
            exit 1
          fi
+      # The official plugins' public key (from PLUGIN_SIGNING_KEY, the seed
+      # `openidea-plugin keygen` writes), built into the app: their packages
+      # must carry its signature whatever the marketplace index lists. Without
+      # the secret the app takes the index's word, as development builds do.
+      - id: plugin-keys
+        env:
+          SIGNING_KEY: ${{ secrets.PLUGIN_SIGNING_KEY }}
+        run: |
+          if [ -n "$SIGNING_KEY" ]; then
+            seed="$(printf %s "$SIGNING_KEY" | base64 -d | od -An -tx1 | tr -d ' \n')"
+            key="$(printf '302e020100300506032b657004220420%s' "$seed" | xxd -r -p |
+              openssl pkey -inform DER -pubout -outform DER | tail -c 32 | base64)"
+            echo "keys=$key" >> "$GITHUB_OUTPUT"
+          fi
      - id: release
-        uses: actions/github-script@v7
+        uses: actions/github-script@v8
        with:
          script: |
            const tag = process.env.TAG;
@@ -57,6 +73,8 @@ jobs:
  build:
    needs: create-release
    name: Build (${{ matrix.name }})
+    env:
+      OPENIDEA_OFFICIAL_PLUGIN_KEYS: ${{ needs.create-release.outputs.official_plugin_keys }}
    strategy:
      fail-fast: false
      matrix:
@@ -81,11 +99,11 @@ jobs:
            target: x86_64-pc-windows-msvc
    runs-on: ${{ matrix.os }}
    steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
        with: { ref: "${{ env.TAG }}" }
-      - uses: pnpm/action-setup@v4
+      - uses: pnpm/action-setup@v5
        with: { version: 11 }
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v5
        with: { node-version: 22, cache: pnpm }
      - uses: dtolnay/rust-toolchain@stable
        with: { targets: "${{ matrix.target }}" }
@@ -155,7 +173,7 @@ jobs:
          - { runner: macos-latest, target: x86_64-apple-darwin, os: macos, arch: x86_64 }
    runs-on: ${{ matrix.runner }}
    steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
        with: { ref: "${{ env.TAG }}" }
      - uses: dtolnay/rust-toolchain@stable
        with: { targets: "${{ matrix.target }}" }
@@ -184,7 +202,11 @@ jobs:
  # (releases/latest/download/plugins-index.json). They are not in the
  # installers: users install them from Settings › Plugins. Without the
  # signing key (secret PLUGIN_SIGNING_KEY: the file `openidea-plugin keygen`
-  # writes) nothing is published and the release goes on.
+  # writes) nothing is published and the release goes on. The index also lists
+  # the community plugins of the registry (COMMUNITY_PLUGINS_INDEX; refreshed
+  # between releases by plugins-index.yml), and the release carries the
+  # openidea-plugin tool for Linux x64, which that workflow and the registry's
+  # checks run.
  plugins:
    needs: create-release
    name: Official plugins
@@ -198,7 +220,7 @@ jobs:
            echo "::warning::PLUGIN_SIGNING_KEY is not set: the official plugins are not published"
            echo "skip=true" >> "$GITHUB_OUTPUT"
          fi
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
        if: steps.key.outputs.skip != 'true'
        with: { ref: "${{ env.TAG }}" }
      - uses: dtolnay/rust-toolchain@stable
@@ -207,10 +229,10 @@ jobs:
      - uses: Swatinem/rust-cache@v2
        if: steps.key.outputs.skip != 'true'
        with: { key: release-plugins }
-      - uses: pnpm/action-setup@v4
+      - uses: pnpm/action-setup@v5
        if: steps.key.outputs.skip != 'true'
        with: { version: 11 }
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v5
        if: steps.key.outputs.skip != 'true'
        with: { node-version: 22 }
      # Builds the web pages; fails when a checked-in component isn't built from these sources.
@@ -237,11 +259,17 @@ jobs:
            version="$(sed -n 's/^version *= *"\(.*\)".*/\1/p' "$dir/plugin.toml" | head -1)"
            "$tool" pack "$dir" --key "$key" --publisher openidea --out "$out/$id-$version.oiplugin"
          done
-          # The published index's revocations and earlier keys carry over.
+          # The published index's revocations, earlier keys and community plugins carry over.
          curl -fsSL "https://github.com/$GITHUB_REPOSITORY/releases/latest/download/plugins-index.json" \
            -o "$out/plugins-index.json" || rm -f "$out/plugins-index.json"
-          "$tool" index "$out" --publisher openidea --name OpenIDEA --key "$key" --out "$out/plugins-index.json"
-          gh release upload "$TAG" "$out"/*.oiplugin "$out/plugins-index.json" --clobber
+          # Downloads point at this release: older versions kept for older IDEs stay where they were published.
+          "$tool" index "$out" --publisher openidea --name OpenIDEA --key "$key" --out "$out/plugins-index.json" \
+            --download-base "https://github.com/$GITHUB_REPOSITORY/releases/download/$TAG"
+          "$tool" merge "$out/plugins-index.json" "$COMMUNITY_PLUGINS_INDEX" --keep openidea ||
+            echo "::warning::the community plugins were not refreshed"
+          gzip -9 -c "$tool" > "$out/openidea-plugin-linux-x86_64.gz"
+          gh release upload "$TAG" "$out"/*.oiplugin "$out/plugins-index.json" \
+            "$out/openidea-plugin-linux-x86_64.gz" --clobber

  # The updater manifest (latest.json), built once from the signed bundles every build uploaded.
  # Fails when a platform is missing, so a release never ships a manifest without it.
@@ -249,7 +277,7 @@ jobs:
    needs: [create-release, build]
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/github-script@v7
+      - uses: actions/github-script@v8
        env:
          RELEASE_ID: ${{ needs.create-release.outputs.release_id }}
        with:
@@ -309,7 +337,7 @@ jobs:
    needs: [create-release, build, server, plugins, updater-manifest]
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/github-script@v7
+      - uses: actions/github-script@v8
        env:
          RELEASE_ID: ${{ needs.create-release.outputs.release_id }}
        with:
@@ -18,9 +18,12 @@ Visual style: dark, low-contrast greys, one cool accent
 - `src/ui/` — design-system primitives. `src/features/<name>/` — one feature each,
  exporting `activate()` registered in `src/features/index.ts`.
 - `languages/<id>.toml` — language definitions (detection, comments, LSP, DAP).
- `crates/ide-host` — the `openidea-server` binary for remote development.
- `wit/` — plugin interface definitions; `plugins/` — sample and bundled plugins;
-  `templates/` — plugin starter templates.
+- `crates/ide-host` — the `openidea-server` binary for remote development and the
+  `openidea-plugin` CLI (plugin starter templates live in its `templates.rs`).
+- `wit/` — plugin interface definitions; `plugins/` — sample and bundled plugins.
+  Plugin docs: `plugins/README.md`, `docs/plugins/themes.md`.
+- `java/` — JDT LS extension bundles (`java-usages`, `kotlin-bridge`) and the patched
+  Lombok agent, embedded into the app by `ide-sdk` / `ide-tools`.
 - `e2e/` — Playwright UI tests (`pnpm e2e`). `fixtures/` — sample projects per language
  for manual and automated testing.

@@ -46,8 +49,8 @@ Visual style: dark, low-contrast greys, one cool accent

 ## Issues & PRs

-Follow `CONTRIBUTING.md` and `.github/pull_request_template.md`: one issue per PR with
-`Closes #<n>`, reproduce first, keep the diff focused, short plain description, and a
+Follow `CONTRIBUTING.md` and `.github/pull_request_template.md`: one problem per PR
+(`Closes #<n>` when it resolves an issue), reproduce first, keep the diff focused, short plain description, and a
 **How it was verified** section with commands run, results and (for UI) before/after screenshots.
 Unclear product decisions → `needs-decision` and stop.

@@ -64,6 +67,13 @@ Shared agent skills live in `.agents/skills/` (`.claude/skills/` links to them):
  this worktree's running MCP bridges and actual ports.
 - `pnpm build` — typecheck + bundle frontend.
 - `cargo nextest run --workspace` (or `cargo test`), `cargo clippy --workspace --all-targets -- -D warnings`, `cargo fmt --all`.
+- `cargo test -p ide-host --test language_smoke -- --ignored --exact <language>` — code intelligence
+  on `fixtures/` with that language's real server installed (CI: `Language smoke`, pinned versions).
+- `pnpm smoke smoke/run.test.ts -t <language>` — run and test that language's fixture through the
+  run store and a real `openidea-server` (build it first: `cargo build -p ide-host --bin openidea-server`).
+- `pnpm smoke smoke/debug.test.ts -t <language>` — debug that fixture's entry point the same way, with
+  the debugger the IDE installs (on macOS, CodeLLDB and Delve may need Developer Mode:
+  `sudo DevToolsSecurity -enable`).
 - `pnpm test`, `pnpm e2e`, `pnpm lint`, `pnpm format:check`, `pnpm knip`, `pnpm typecheck`,
  `pnpm gen:bindings`.
 - `pnpm perf` (UI interaction latency / frames / leaks), `pnpm perf:rust` (criterion
@@ -111,8 +121,8 @@ Several worktrees can be developed and run side by side.
  default MCP session belongs to this worktree.
 - Keep each worktree's Cargo output directory separate; do not point `CARGO_TARGET_DIR` or
  `target` symlinks at a shared directory.
- Each worktree's first build is cold (around 5 minutes) and its Cargo output takes
-  15–30 GB. Avoid running several heavy builds on one machine at the same time.
+- Each worktree's first build is cold (several minutes) and `cargo build` output takes
+  around 9 GB; tests, clippy and incremental builds add more. Avoid running several heavy builds on one machine at the same time.
 - Stop only processes started for the current worktree/session. Never use broad
  process-name kills such as `pkill openidea`.
 - When done: stop that worktree's app and dev session, delete its build output, then
@@ -16,8 +16,7 @@ Project layout, coding rules, commands and checks are in [AGENTS.md](AGENTS.md).

 ## Pull requests

- One issue per PR, linked with `Closes #123`. Feature PRs need a `planned` issue.
-  Docs, CI and pure refactors may skip the issue.
+- One problem per PR. If it resolves an issue, link it with `Closes #123`.
 - Reproduce the problem first, or write a test that fails before the fix.
 - Fix the cause, and check whether the same cause breaks anything nearby.
 - Keep the diff focused. Unrelated refactors go in their own PR.
@@ -31,5 +30,9 @@ Project layout, coding rules, commands and checks are in [AGENTS.md](AGENTS.md).
 - If a change needs a product decision you can't make, ask in the issue and stop
  rather than guessing.

-A check on each PR adds `needs-info` when the issue link or the verification
-section is missing, and removes it once they're filled in.
+Plugins: pull requests here add or change official plugins (`plugins/official/`)
+and the plugin API. Community plugins live in their authors' repositories and
+are listed through [l0ng-ai/openidea-plugins](https://github.com/l0ng-ai/openidea-plugins);
+see [`plugins/README.md`](plugins/README.md) § 8.1.
+
+A check on each PR adds `needs-info` when the verification section is missing, and removes it once it's filled in.
@@ -123,6 +123,17 @@ version = "1.0.104"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "330a5ed07fa54e4702c9d6c4174f74427fc0ef6e214bbd677ae50a5099946470"

+[[package]]
+name = "apple-native-keyring-store"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b350bfd03649e07aa05c0a81b3e15934374e585c98204a57e20b9d49f49bb9a"
+dependencies = [
+ "keyring-core",
+ "log",
+ "security-framework",
+]
+
 [[package]]
 name = "arbitrary"
 version = "1.5.0"
@@ -156,6 +167,27 @@ version = "0.7.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d3fb67a6e08acf24fdeccbac2cb6ac4305825bd1f117462e0e6f2f193345ad56"

+[[package]]
+name = "ashpd"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2f3f79755c74fd155000314eb349864caa787c6592eace6c6882dad873d9c39"
+dependencies = [
+ "enumflags2",
+ "futures-channel",
+ "futures-util",
+ "rand 0.9.5",
+ "raw-window-handle",
+ "serde",
+ "serde_repr",
+ "tokio",
+ "url",
+ "wayland-backend",
+ "wayland-client",
+ "wayland-protocols",
+ "zbus",
+]
+
 [[package]]
 name = "ast-grep-core"
 version = "0.40.1"
@@ -1600,6 +1632,7 @@ dependencies = [
 "lock_api",
 "once_cell",
 "parking_lot_core",
+ "serde",
 ]

 [[package]]
@@ -1795,6 +1828,15 @@ dependencies = [
 "syn 3.0.9",
 ]

+[[package]]
+name = "dlib"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ab8ecd87370524b461f8557c119c405552c396ed91fc0a8eec68679eab26f94a"
+dependencies = [
+ "libloading",
+]
+
 [[package]]
 name = "dlopen2"
 version = "0.8.2"
@@ -2163,15 +2205,6 @@ dependencies = [
 "rustc_version",
 ]

-[[package]]
-name = "file-id"
-version = "0.2.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e1fc6a637b6dc58414714eddd9170ff187ecb0933d4c7024d1abbd23a3cc26e9"
-dependencies = [
- "windows-sys 0.60.2",
-]
-
 [[package]]
 name = "filedescriptor"
 version = "0.8.3"
@@ -4038,7 +4071,7 @@ checksum = "3d3067d79b975e8844ca9eb072e16b31c3c1c36928edf9c6789548c524d0d954"

 [[package]]
 name = "ide-agent"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "dunce",
 "encoding_rs",
@@ -4061,7 +4094,7 @@ dependencies = [

 [[package]]
 name = "ide-analysis"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "ast-grep-core",
 "ide-core",
@@ -4075,7 +4108,7 @@ dependencies = [

 [[package]]
 name = "ide-build"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "dirs 6.0.0",
 "dunce",
@@ -4090,7 +4123,7 @@ dependencies = [

 [[package]]
 name = "ide-clipboard"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "objc2 0.6.5",
 "objc2-app-kit 0.3.2",
@@ -4099,7 +4132,7 @@ dependencies = [

 [[package]]
 name = "ide-core"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "dunce",
 "encoding_rs",
@@ -4116,11 +4149,11 @@ dependencies = [

 [[package]]
 name = "ide-coverage"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "ide-core",
 "ide-run",
- "quick-xml",
+ "quick-xml 0.42.0",
 "serde",
 "serde_json",
 "specta",
@@ -4130,7 +4163,7 @@ dependencies = [

 [[package]]
 name = "ide-dap"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "ide-core",
 "ide-jsonrpc",
@@ -4148,7 +4181,7 @@ dependencies = [

 [[package]]
 name = "ide-db"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "bb8",
 "dirs 6.0.0",
@@ -4174,7 +4207,7 @@ dependencies = [

 [[package]]
 name = "ide-docker"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "ide-core",
 "serde",
@@ -4187,7 +4220,7 @@ dependencies = [

 [[package]]
 name = "ide-extension"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "base64 0.22.1",
 "blake3",
@@ -4207,7 +4240,7 @@ dependencies = [

 [[package]]
 name = "ide-fonts"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "objc2-core-foundation",
 "objc2-core-text",
@@ -4219,7 +4252,7 @@ dependencies = [

 [[package]]
 name = "ide-github"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "ide-core",
 "ide-vcs",
@@ -4232,7 +4265,7 @@ dependencies = [

 [[package]]
 name = "ide-host"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "base64 0.22.1",
 "criterion",
@@ -4272,10 +4305,11 @@ dependencies = [
 "ide-workspace",
 "ignore",
 "parking_lot",
- "quick-xml",
+ "quick-xml 0.42.0",
 "regex-syntax",
 "reqwest",
 "rustix",
+ "semver",
 "serde",
 "serde_json",
 "specta",
@@ -4292,7 +4326,7 @@ dependencies = [

 [[package]]
 name = "ide-http"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "ide-core",
 "parking_lot",
@@ -4310,7 +4344,7 @@ dependencies = [

 [[package]]
 name = "ide-index"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "blake3",
 "criterion",
@@ -4332,7 +4366,7 @@ dependencies = [

 [[package]]
 name = "ide-jsonrpc"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "encoding_rs",
 "futures",
@@ -4340,6 +4374,7 @@ dependencies = [
 "parking_lot",
 "serde",
 "serde_json",
+ "tempfile",
 "thiserror 2.0.21",
 "tokio",
 "tokio-util",
@@ -4348,7 +4383,7 @@ dependencies = [

 [[package]]
 name = "ide-language"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "blake3",
 "criterion",
@@ -4404,7 +4439,7 @@ dependencies = [

 [[package]]
 name = "ide-lsp"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "dunce",
 "futures",
@@ -4430,7 +4465,7 @@ dependencies = [

 [[package]]
 name = "ide-notebook"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "futures",
 "ide-core",
@@ -4453,7 +4488,7 @@ dependencies = [

 [[package]]
 name = "ide-plugin"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "blake3",
 "ide-core",
@@ -4473,7 +4508,7 @@ dependencies = [

 [[package]]
 name = "ide-profiler"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "ide-core",
 "ide-run",
@@ -4486,7 +4521,7 @@ dependencies = [

 [[package]]
 name = "ide-remote"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "globset",
 "ide-core",
@@ -4503,7 +4538,7 @@ dependencies = [

 [[package]]
 name = "ide-run"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "dunce",
 "encoding_rs",
@@ -4512,7 +4547,7 @@ dependencies = [
 "libc",
 "parking_lot",
 "portable-pty",
- "quick-xml",
+ "quick-xml 0.42.0",
 "serde",
 "serde_json",
 "specta",
@@ -4526,7 +4561,7 @@ dependencies = [

 [[package]]
 name = "ide-sdk"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "dunce",
 "ide-core",
@@ -4545,7 +4580,7 @@ dependencies = [

 [[package]]
 name = "ide-search"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "criterion",
 "globset",
@@ -4565,7 +4600,7 @@ dependencies = [

 [[package]]
 name = "ide-spell"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "ide-core",
 "parking_lot",
@@ -4578,11 +4613,13 @@ dependencies = [

 [[package]]
 name = "ide-ssh"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "dirs 6.0.0",
 "flate2",
 "ide-core",
+ "keyring",
+ "keyring-core",
 "parking_lot",
 "russh",
 "russh-config",
@@ -4593,11 +4630,12 @@ dependencies = [
 "tempfile",
 "tokio",
 "tracing",
+ "uuid",
 ]

 [[package]]
 name = "ide-syntax"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "ide-core",
 "ide-language",
@@ -4612,7 +4650,7 @@ dependencies = [

 [[package]]
 name = "ide-terminal"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "ide-core",
 "libc",
@@ -4625,19 +4663,20 @@ dependencies = [

 [[package]]
 name = "ide-text"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "criterion",
 "ide-core",
 "proptest",
 "ropey",
 "serde",
+ "similar",
 "specta",
 ]

 [[package]]
 name = "ide-tools"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "flate2",
 "hex",
@@ -4658,14 +4697,16 @@ dependencies = [

 [[package]]
 name = "ide-vcs"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
+ "blake3",
 "dunce",
 "encoding_rs",
 "gix",
 "ide-core",
 "ignore",
 "libc",
+ "redb",
 "regex-lite",
 "serde",
 "serde_json",
@@ -4677,7 +4718,7 @@ dependencies = [

 [[package]]
 name = "ide-vfs"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "chardetng",
 "dunce",
@@ -4686,7 +4727,7 @@ dependencies = [
 "globset",
 "ide-core",
 "ignore",
- "notify-debouncer-full",
+ "notify",
 "parking_lot",
 "serde",
 "serde_json",
@@ -4699,7 +4740,7 @@ dependencies = [

 [[package]]
 name = "ide-web"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "ide-core",
 "open",
@@ -4715,7 +4756,7 @@ dependencies = [

 [[package]]
 name = "ide-workspace"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "blake3",
 "dunce",
@@ -4733,6 +4774,7 @@ dependencies = [
 "toml 0.9.12+spec-1.1.0",
 "toml_edit 0.25.17+spec-1.1.0",
 "tracing",
+ "uuid",
 "zip",
 ]

@@ -5210,6 +5252,33 @@ dependencies = [
 "serde",
 ]

+[[package]]
+name = "keyring"
+version = "4.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2270074a3d26bcac93c1dc5d2845eb4c089e8d761ccf6e0ea266a16004640627"
+dependencies = [
+ "apple-native-keyring-store",
+ "keyring-core",
+ "windows-native-keyring-store",
+ "zbus-secret-service-keyring-store",
+]
+
+[[package]]
+name = "keyring-core"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29fbf4b551298c67925f38cf341a1ada797a75f1837bdf8ae1fc8e2ebc6efb59"
+dependencies = [
+ "chrono",
+ "dashmap",
+ "log",
+ "regex",
+ "ron",
+ "serde",
+ "uuid",
+]
+
 [[package]]
 name = "kqueue"
 version = "1.2.1"
@@ -5632,19 +5701,6 @@ dependencies = [
 "windows-sys 0.60.2",
 ]

-[[package]]
-name = "notify-debouncer-full"
-version = "0.6.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "375bd3a138be7bfeff3480e4a623df4cbfb55b79df617c055cd810ba466fa078"
-dependencies = [
- "file-id",
- "log",
- "notify",
- "notify-types",
- "walkdir",
-]
-
 [[package]]
 name = "notify-types"
 version = "2.1.0"
@@ -5673,6 +5729,30 @@ dependencies = [
 "unicode-segmentation",
 ]

+[[package]]
+name = "num"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "35bd024e8b2ff75562e5f34e7f4905839deb4b22955ef5e73d2fea1b9813cb23"
+dependencies = [
+ "num-bigint 0.4.8",
+ "num-complex",
+ "num-integer",
+ "num-iter",
+ "num-rational",
+ "num-traits",
+]
+
+[[package]]
+name = "num-bigint"
+version = "0.4.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c89e69e7e0f03bea5ef08013795c25018e101932225a656383bd384495ecc367"
+dependencies = [
+ "num-integer",
+ "num-traits",
+]
+
 [[package]]
 name = "num-bigint"
 version = "0.5.1"
@@ -5685,6 +5765,15 @@ dependencies = [
 "rand_core 0.10.1",
 ]

+[[package]]
+name = "num-complex"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "73f88a1307638156682bada9d7604135552957b7818057dcef22705b4d509495"
+dependencies = [
+ "num-traits",
+]
+
 [[package]]
 name = "num-conv"
 version = "0.2.2"
@@ -5700,6 +5789,27 @@ dependencies = [
 "num-traits",
 ]

+[[package]]
+name = "num-iter"
+version = "0.1.46"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c92800bd69a1eac91786bcfe9da64a897eb72911b8dc3095decbd07429e8048b"
+dependencies = [
+ "num-integer",
+ "num-traits",
+]
+
+[[package]]
+name = "num-rational"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f83d14da390562dca69fc84082e73e548e1ad308d24accdedd2720017cb37824"
+dependencies = [
+ "num-bigint 0.4.8",
+ "num-integer",
+ "num-traits",
+]
+
 [[package]]
 name = "num-traits"
 version = "0.2.19"
@@ -6187,7 +6297,7 @@ dependencies = [

 [[package]]
 name = "openidea"
-version = "0.1.35"
+version = "0.1.36"
 dependencies = [
 "base64 0.22.1",
 "blake3",
@@ -6588,7 +6698,7 @@ checksum = "65dca778f41c79ebbe8b2b2139fee86f01b766b67130d108c7c2b8ffbd949f77"
 dependencies = [
 "base64 0.23.1",
 "indexmap 2.14.2",
- "quick-xml",
+ "quick-xml 0.42.0",
 "serde",
 "time",
 ]
@@ -6633,6 +6743,12 @@ dependencies = [
 "windows-sys 0.61.2",
 ]

+[[package]]
+name = "pollster"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2f3a9f18d041e6d0e102a0a46750538147e5e8992d3b4873aaafee2520b00ce3"
+
 [[package]]
 name = "poly1305"
 version = "0.9.1"
@@ -6893,6 +7009,15 @@ version = "1.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a1d01941d82fa2ab50be1e79e6714289dd7cde78eba4c074bc5a4374f650dfe0"

+[[package]]
+name = "quick-xml"
+version = "0.41.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e660451e55124f798a69a5af3f49ccfbefbd41910eefd25caf2393e1f3473ec1"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "quick-xml"
 version = "0.42.0"
@@ -7170,18 +7295,18 @@ version = "0.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a15ad77d9e70a92437d8f74c35d99b4e4691128df018833e99f90bcd36152672"
 dependencies = [
+ "ashpd",
 "block2 0.6.2",
 "dispatch2",
- "glib-sys",
- "gobject-sys",
- "gtk-sys",
 "js-sys",
 "log",
 "objc2 0.6.5",
 "objc2-app-kit 0.3.2",
 "objc2-core-foundation",
 "objc2-foundation 0.3.2",
+ "pollster",
 "raw-window-handle",
+ "urlencoding",
 "wasm-bindgen",
 "wasm-bindgen-futures",
 "web-sys",
@@ -7202,6 +7327,19 @@ dependencies = [
 "windows-sys 0.52.0",
 ]

+[[package]]
+name = "ron"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "97b3fe97c18ff24299ea56f802c5693eb34266fb0bc8317f4e101debc8a3ceaf"
+dependencies = [
+ "bitflags 2.13.2",
+ "serde",
+ "serde_derive",
+ "typeid",
+ "unicode-ident",
+]
+
 [[package]]
 name = "ropey"
 version = "1.6.1"
@@ -7268,7 +7406,7 @@ dependencies = [
 "md5",
 "ml-kem",
 "module-lattice",
- "num-bigint",
+ "num-bigint 0.5.1",
 "p256",
 "p384",
 "p521",
@@ -7599,6 +7737,12 @@ dependencies = [
 "syn 2.0.119",
 ]

+[[package]]
+name = "scoped-tls"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e1cf6437eb19a8f4a6cc0f7dca544973b0b78843adbfeb3683d1a94a0024a294"
+
 [[package]]
 name = "scopeguard"
 version = "1.2.0"
@@ -7649,6 +7793,25 @@ dependencies = [
 "zeroize",
 ]

+[[package]]
+name = "secret-service"
+version = "5.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5107b24b91445dd2aa449a258a1807b63240942157292354dc5bfdbeb8bc6db8"
+dependencies = [
+ "aes",
+ "cbc",
+ "futures-util",
+ "getrandom 0.4.3",
+ "hkdf",
+ "hybrid-array",
+ "num",
+ "once_cell",
+ "serde",
+ "sha2 0.11.1",
+ "zbus",
+]
+
 [[package]]
 name = "security-framework"
 version = "3.7.0"
@@ -9137,7 +9300,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "32497e9a4c7b38532efcdebeef879707aa9f794296a4f0244f6f69e9bc8574bd"
 dependencies = [
 "fastrand",
- "getrandom 0.3.4",
+ "getrandom 0.4.3",
 "once_cell",
 "rustix",
 "windows-sys 0.61.2",
@@ -9325,6 +9488,7 @@ dependencies = [
 "signal-hook-registry",
 "socket2",
 "tokio-macros",
+ "tracing",
 "windows-sys 0.61.2",
 ]

@@ -10661,6 +10825,66 @@ dependencies = [
 "wasmtime",
 ]

+[[package]]
+name = "wayland-backend"
+version = "0.3.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38a91b4eaddff87b1cd1074985e3713da4af2c49742d1b356b2c01670a67a078"
+dependencies = [
+ "cc",
+ "downcast-rs",
+ "rustix",
+ "scoped-tls",
+ "smallvec",
+ "wayland-sys",
+]
+
+[[package]]
+name = "wayland-client"
+version = "0.31.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3c36a0f861ad76d0901f2800b46321410d9f73f2ea88aac0650d86c32688073"
+dependencies = [
+ "bitflags 2.13.2",
+ "rustix",
+ "wayland-backend",
+ "wayland-scanner",
+]
+
+[[package]]
+name = "wayland-protocols"
+version = "0.32.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23d0c813de3daa2ed6520af85a3bd49b0e722a3078506899aa9686fea58dc4b6"
+dependencies = [
+ "bitflags 2.13.2",
+ "wayland-backend",
+ "wayland-client",
+ "wayland-scanner",
+]
+
+[[package]]
+name = "wayland-scanner"
+version = "0.31.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "338e30461b3a2b67d70eb30a6d89f8e0c93a833e07d2ae89085cd070c4a00ac0"
+dependencies = [
+ "proc-macro2",
+ "quick-xml 0.41.0",
+ "quote",
+]
+
+[[package]]
+name = "wayland-sys"
+version = "0.31.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d8eab23fefc9e41f8e841df4a9c707e8a8c4ed26e944ef69297184de2785e3be"
+dependencies = [
+ "dlib",
+ "log",
+ "pkg-config",
+]
+
 [[package]]
 name = "web-sys"
 version = "0.3.106"
@@ -10946,6 +11170,19 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"

+[[package]]
+name = "windows-native-keyring-store"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "063426e76fdec7438d56bb777f67e318a84a25c707b07e575cb8b78e10c028f8"
+dependencies = [
+ "byteorder",
+ "keyring-core",
+ "regex",
+ "windows-sys 0.61.2",
+ "zeroize",
+]
+
 [[package]]
 name = "windows-numerics"
 version = "0.3.1"
@@ -11472,6 +11709,7 @@ dependencies = [
 "rustix",
 "serde",
 "serde_repr",
+ "tokio",
 "tracing",
 "uds_windows",
 "uuid",
@@ -11482,6 +11720,17 @@ dependencies = [
 "zvariant",
 ]

+[[package]]
+name = "zbus-secret-service-keyring-store"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "74801d001b9e7729adb4f1825b67b398185fed424749aa3d8bacf70417137d9a"
+dependencies = [
+ "keyring-core",
+ "secret-service",
+ "zbus",
+]
+
 [[package]]
 name = "zbus_macros"
 version = "5.19.0"
@@ -11687,6 +11936,7 @@ dependencies = [
 "endi",
 "enumflags2",
 "serde",
+ "url",
 "winnow 1.0.4",
 "zcheapstr",
 "zvariant_derive",
@@ -5,7 +5,7 @@ members = ["crates/*", "src-tauri"]
 exclude = ["sdk", "plugins"]

 [workspace.package]
-version = "0.1.35"
+version = "0.1.36"
 edition = "2024"
 rust-version = "1.96"
 license = "Apache-2.0"
@@ -76,7 +76,6 @@ ignore = "0.4"
 base64 = "0.22"
 globset = "0.4"
 notify = "8"
-notify-debouncer-full = "0.6"
 trash = "5"
 blake3 = "1"
 dunce = "1"
@@ -106,6 +105,9 @@ sqlx = { version = "0.9", default-features = false, features = ["runtime-tokio",
 tiberius = { version = "0.13", default-features = false, features = ["tds73", "rustls", "sql-browser-tokio"] }
 bb8 = "0.9"
 uuid = { version = "1", features = ["v4"] }
+# OS credential stores
+keyring = "4.2"
+keyring-core = "1"

 # testing
 insta = { version = "1", features = ["yaml"] }
@@ -115,8 +117,14 @@ tempfile = "3"
 [profile.dev]
 # Keep debug builds snappy while giving dependencies decent speed.
 opt-level = 0
+# Full debug info is most of target/. Line tables keep file:line in our backtraces, but a
+# debugger can't show locals; re-enable with `--config profile.dev.debug=true`.
+debug = "line-tables-only"
 [profile.dev.package."*"]
 opt-level = 2
+# Dependency frames keep function names only. Re-enable one with
+# `--config 'profile.dev.package.<crate>.debug=true'`.
+debug = false

 [profile.release]
 codegen-units = 1
@@ -14,6 +14,8 @@
  &nbsp;·&nbsp;
  <a href="#benchmark">Benchmark</a>
  &nbsp;·&nbsp;
+  <a href="#plugins">Plugins</a>
+  &nbsp;·&nbsp;
  <a href="https://discord.gg/2Zy4yn7gP">Discord</a>
 </p>

@@ -45,6 +47,16 @@ IDEA analyses Python more deeply, so "ready" doesn't mean the same work on
 both sides. Both are measured from the outside, the same way: see
 [`perf/compare`](perf/compare) to run it on your machine and projects.

+## Plugins
+
+Plugins add actions, completion, quick fixes, tool windows, custom editors,
+themes, file icons and languages. They run as sandboxed WebAssembly components;
+themes, icon themes and languages need no code at all.
+
+Install them from Settings › Plugins, or start your own with
+`openidea-plugin new` — see [Writing OpenIDEA plugins](plugins/README.md) and
+the [official plugins](plugins/official). The plugin API is still a preview.
+
 ## License

 [Apache 2.0](LICENSE). Bundled third-party assets are listed in [`THIRD_PARTY_LICENSES.md`](THIRD_PARTY_LICENSES.md).
@@ -2,12 +2,12 @@

 ## Project Lombok

-`plugins/lombok/lombok-1.18.48-openidea.2.jar` contains Project Lombok v1.18.48 with the Equinox
+`java/lombok/lombok-1.18.48-openidea.2.jar` contains Project Lombok v1.18.48 with the Equinox
 classloader fix from [projectlombok/lombok#4059](https://github.com/projectlombok/lombok/pull/4059)
 and the ECJ constructor-call fix from [projectlombok/lombok#4089](https://github.com/projectlombok/lombok/pull/4089).
 Copyright (C) 2009-2021 The Project Lombok Authors. MIT license and bundled component
-notices are retained in [plugins/lombok/LICENSE](plugins/lombok/LICENSE) and inside the jar.
-Source tag, patch commits and build instructions: [plugins/lombok/README.md](plugins/lombok/README.md).
+notices are retained in [java/lombok/LICENSE](java/lombok/LICENSE) and inside the jar.
+Source tag, patch commits and build instructions: [java/lombok/README.md](java/lombok/README.md).

 ## JetBrains IntelliJ Platform icons

@@ -52,6 +52,15 @@ Their original copyright headers and Apache-2.0 licensing are retained.

 At render time `src/ui/icons.tsx` may recolour monochrome icons to `currentColor`.

+## JetBrains IntelliJ Platform VCS log graph algorithms
+
+`crates/ide-vcs/src/bek.rs` and `src/features/vcs/graph.ts` adapt the Bek ordering,
+graph layout and LinearBek merge linearization algorithms from
+[intellij-community](https://github.com/JetBrains/intellij-community/tree/1d70d5c54302d655758edbd2f808fb8dea8b1764/platform/vcs-log/graph/src/com/intellij/vcs/log/graph)
+(`impl/facade/sort/bek`, `impl/permanent/GraphLayoutBuilder.kt` and
+`linearBek/LinearBekGraphBuilder.java`). Modified from the originals.
+Copyright 2000-2026 JetBrains s.r.o. and contributors. Apache License 2.0 (below).
+
 ## JetBrains IntelliJ Platform diff algorithm

 `src/features/vcs/comparison/**` is a TypeScript port of the text comparison of
@@ -58,6 +58,8 @@ pub(crate) const LIMITS_UPDATE: &str = "openidea_limits";
 const MAX_EMBED: u64 = 256 * 1024;
 /// How long a probe waits for the agent to answer `initialize`.
 const PROBE_TIMEOUT: Duration = Duration::from_secs(30);
+/// How long deleting a task waits for its agent to exit before removing the worktree.
+const EXIT_WAIT: Duration = Duration::from_secs(5);

 /// The agent tasks of one project.
 pub struct AgentManager {
@@ -839,7 +841,7 @@ impl AgentManager {
    /// Forgets the task; with `remove_worktree` also deletes its worktree (the branch stays).
    pub async fn delete(&self, id: &str, remove_worktree: bool) -> IdeResult<()> {
        let task = self.task(id)?;
-        task.kill();
+        let live = task.kill();
        let (isolation, cwd, root) = {
            let s = task.state.lock();
            (
@@ -851,6 +853,11 @@ impl AgentManager {
        // A copy of the task (a fork) may work in the same worktree.
        let shared = self.tasks.read().values().any(|t| t.id != id && t.state.lock().task.cwd.0 == cwd);
        if remove_worktree && !shared && isolation == Isolation::Worktree && cwd.exists() {
+            // On Windows the agent's processes lock the folder (their working directory,
+            // open files) until they have exited.
+            if let Some(peer) = live {
+                let _ = tokio::time::timeout(EXIT_WAIT, peer.exited()).await;
+            }
            let worktrees = self.shared.paths.worktrees_dir.clone();
            blocking(move || worktree::remove(&root, &worktrees, &cwd)).await?;
        }
@@ -1605,11 +1612,12 @@ impl Task {
        }
    }

-    fn kill(&self) {
+    /// Stops the agent; returns its connection, to wait for its process to exit.
+    fn kill(&self) -> Option<acp::Conn> {
        self.cancel_permissions();
-        if let Some(live) = self.live.lock().take() {
-            live.peer.kill();
-        }
+        let live = self.live.lock().take()?;
+        live.peer.kill();
+        Some(live.peer)
    }
 }

@@ -1109,3 +1109,114 @@ async fn idle_agents_stop_and_resume_their_session_on_the_next_message() {
    assert!(live(&mgr, &task.id));
    mgr.shutdown();
 }
+
+/// Deleting a task whose agent still runs in the worktree removes both and leaves no
+/// process behind, whether it is waiting for permission or idle without session/load.
+#[tokio::test(flavor = "multi_thread")]
+async fn deleting_a_task_waits_for_its_agent_to_exit_before_removing_the_worktree() {
+    for no_load in [false, true] {
+        delete_running_agent(no_load).await;
+    }
+}
+
+async fn delete_running_agent(no_load: bool) {
+    let tmp = tempfile::tempdir().unwrap();
+    let root = dunce::canonicalize(tmp.path()).unwrap();
+    let git = |args: &[&str]| {
+        let out = std::process::Command::new("git")
+            .args(["-c", "user.name=t", "-c", "user.email=t@t", "-c", "commit.gpgsign=false"])
+            .args(args)
+            .current_dir(&root)
+            .output()
+            .unwrap();
+        assert!(out.status.success(), "{}", String::from_utf8_lossy(&out.stderr));
+    };
+    git(&["init", "-q", "-b", "main"]);
+    std::fs::write(root.join("file.txt"), "original\n").unwrap();
+    git(&["add", "."]);
+    git(&["commit", "-qm", "initial"]);
+
+    let agent = Arc::new(FakeAgent { no_load, ..FakeAgent::default() });
+    let pids: Arc<Mutex<Vec<u32>>> = Arc::default();
+    let (fake, started) = (agent.clone(), pids.clone());
+    // The fake agent, served on behalf of a real process that exits only when killed.
+    let connector: Connector = Arc::new(move |_spec, cwd, client, _stderr| {
+        #[cfg(unix)]
+        let mut cmd = {
+            let mut cmd = tokio::process::Command::new("sleep");
+            cmd.arg("30");
+            cmd
+        };
+        #[cfg(windows)]
+        let mut cmd = {
+            let mut cmd = tokio::process::Command::new("cmd");
+            cmd.args(["/D", "/C", "echo ready>agent-ready & ping -n 30 127.0.0.1 >nul"]);
+            cmd
+        };
+        ide_core::process::prepare(cmd.as_std_mut());
+        ide_core::process::own_group(cmd.as_std_mut());
+        cmd.current_dir(cwd).kill_on_drop(true);
+        let child = cmd.spawn()?;
+        started.lock().push(child.id().unwrap());
+        let (a, b) = duplex(1 << 20);
+        let (ar, aw) = tokio::io::split(a);
+        let (br, bw) = tokio::io::split(b);
+        // `connect_with_child` frames with Content-Length.
+        fake.servers.lock().push(Peer::connect(br, bw, fake.clone()));
+        Ok(Peer::connect_with_child(ar, aw, client, child))
+    });
+    let mgr = AgentManager::with_connector(
+        AgentPaths {
+            project_root: root.clone(),
+            store_dir: root.join("store"),
+            worktrees_dir: root.join("worktrees"),
+            models_file: root.join("models.json"),
+            custom_agents_dir: None,
+            home_dir: None,
+        },
+        tokio::runtime::Handle::current(),
+        connector,
+    );
+    let task = mgr
+        .create(NewAgentTask {
+            project_root: None,
+            prompt: text(if no_load { "again" } else { "Fix the lexer" }),
+            provider: "claude".into(),
+            config: vec![],
+            isolation: Isolation::Worktree,
+            base: None,
+        })
+        .await
+        .unwrap();
+    wait_for(&mgr, &task.id, if no_load { AgentStatus::Ready } else { AgentStatus::NeedsInput }).await;
+    let pid = *pids.lock().last().expect("the agent was started");
+
+    #[cfg(windows)]
+    {
+        tokio::time::timeout(Duration::from_secs(5), async {
+            while !task.cwd.0.join("agent-ready").exists() {
+                tokio::time::sleep(Duration::from_millis(10)).await;
+            }
+        })
+        .await
+        .unwrap();
+        assert_eq!(
+            std::fs::rename(&task.cwd.0, task.cwd.0.with_extension("moved")).unwrap_err().raw_os_error(),
+            Some(32),
+            "the running agent really locks its worktree"
+        );
+    }
+
+    mgr.delete(&task.id, true).await.unwrap();
+    assert!(!task.cwd.0.exists());
+    // Killed and reaped: not even a zombie is left.
+    #[cfg(unix)]
+    let alive = std::process::Command::new("kill").args(["-0", &pid.to_string()]).status().unwrap().success();
+    #[cfg(windows)]
+    let alive = {
+        let mut cmd = std::process::Command::new("tasklist");
+        ide_core::process::prepare(&mut cmd).args(["/FI", &format!("PID eq {pid}"), "/FO", "CSV", "/NH"]);
+        String::from_utf8_lossy(&cmd.output().unwrap().stdout).contains(&format!("\"{pid}\""))
+    };
+    assert!(!alive, "the agent (pid {pid}) is still running");
+}
@@ -5,7 +5,7 @@ use ide_core::{IdeError, IdeResult, IpcPath};
 use ide_vcs::{ChangeKind, Repo};
 use std::collections::BTreeMap;
 use std::path::{Path, PathBuf};
-use std::time::UNIX_EPOCH;
+use std::time::{Duration, UNIX_EPOCH};

 pub(crate) struct Created {
    pub path: PathBuf,
@@ -65,7 +65,27 @@ pub(crate) fn remove(project_root: &Path, worktrees_dir: &Path, path: &Path) ->
    if !path.starts_with(worktrees_dir) || path == worktrees_dir {
        return Err(err);
    }
-    std::fs::remove_dir_all(path).map_err(|e| IdeError::internal(e.to_string()))
+    retrying(REMOVE_ATTEMPTS, REMOVE_PAUSE, || std::fs::remove_dir_all(path))
+        .map_err(|e| IdeError::internal(format!("{}: {e}", path.display())))
+}
+
+/// On Windows a folder can't be deleted while a process still has a file in it open
+/// (os error 32): an agent's helper that outlived it, an antivirus scan, the search indexer.
+/// Those let go within moments, so removing is retried for a few seconds.
+const REMOVE_ATTEMPTS: u32 = 10;
+const REMOVE_PAUSE: Duration = Duration::from_millis(300);
+
+fn retrying(attempts: u32, pause: Duration, mut op: impl FnMut() -> std::io::Result<()>) -> std::io::Result<()> {
+    for _ in 1..attempts {
+        match op() {
+            Err(e) if e.kind() != std::io::ErrorKind::NotFound => std::thread::sleep(pause),
+            _ => return Ok(()),
+        }
+    }
+    match op() {
+        Err(e) if e.kind() == std::io::ErrorKind::NotFound => Ok(()),
+        r => r,
+    }
 }

 /// Files under `cwd` that differ from `base` (untracked files included), with line counts.
@@ -149,6 +169,54 @@ fn unique_slug(base: &str, taken: impl Fn(&str) -> bool) -> String {
 mod tests {
    use super::*;

+    #[test]
+    fn removing_is_retried_while_a_file_is_still_in_use() {
+        use std::io::{Error, ErrorKind};
+        // A sharing violation as Windows reports it (os error 32), a vanished folder, other errors.
+        let in_use = || Error::from_raw_os_error(32);
+        for (fails, outcome) in [(0, true), (3, true), (REMOVE_ATTEMPTS - 1, true), (REMOVE_ATTEMPTS, false)] {
+            let mut calls = 0;
+            let r = retrying(REMOVE_ATTEMPTS, Duration::ZERO, || {
+                calls += 1;
+                if calls <= fails { Err(in_use()) } else { Ok(()) }
+            });
+            assert_eq!(r.is_ok(), outcome, "{fails} failures");
+            assert_eq!(calls, (fails + 1).min(REMOVE_ATTEMPTS));
+        }
+        let mut calls = 0;
+        let gone = retrying(REMOVE_ATTEMPTS, Duration::ZERO, || {
+            calls += 1;
+            if calls == 1 { Err(in_use()) } else { Err(Error::from(ErrorKind::NotFound)) }
+        });
+        assert!(gone.is_ok(), "deleted meanwhile: done");
+        assert_eq!(calls, 2);
+    }
+
+    #[cfg(windows)]
+    #[test]
+    fn removing_waits_for_a_windows_file_lock_to_be_released() {
+        use std::os::windows::fs::OpenOptionsExt;
+        let tmp = tempfile::tempdir().unwrap();
+        let repo = tmp.path().join("repo");
+        std::fs::create_dir(&repo).unwrap();
+        git(&repo, &["init", "-q", "-b", "main"]);
+        std::fs::write(repo.join("a.txt"), "one\n").unwrap();
+        git(&repo, &["add", "."]);
+        git(&repo, &["commit", "-q", "-m", "init"]);
+        let worktrees = tmp.path().join("wt");
+        let created = create(&repo, &worktrees, "Locked file", None).unwrap();
+        let file = std::fs::OpenOptions::new().read(true).share_mode(0).open(created.path.join("a.txt")).unwrap();
+        assert_eq!(std::fs::remove_file(created.path.join("a.txt")).unwrap_err().raw_os_error(), Some(32));
+        let release = std::thread::spawn(move || {
+            std::thread::sleep(Duration::from_millis(800));
+            drop(file);
+        });
+        let result = remove(&repo, &worktrees, &created.path);
+        release.join().unwrap();
+        result.unwrap();
+        assert!(!created.path.exists());
+    }
+
    #[test]
    fn slugs_are_branch_safe() {
        assert_eq!(slugify("Fix lexer UTF-16 columns!"), "fix-lexer-utf-16-columns");
@@ -315,7 +315,10 @@ pub fn sync_maven(
    for (n, top) in model.projects.iter().filter(|p| !p.aggregated).enumerate() {
        let effective = cache_dir.join(format!("effective-pom-{n}.xml"));
        let _ = std::fs::remove_file(&effective);
-        let mut args: Vec<String> = vec!["-B".into(), "-fae".into(), "-Dstyle.color=never".into()];
+        // `-T1` keeps mvnd serial: its default parallel build interleaves the
+        // `dependency:tree` output of concurrent modules, which the sync parses
+        // as one stream. mvn is serial anyway, so this only pins the daemon.
+        let mut args: Vec<String> = vec!["-B".into(), "-fae".into(), "-Dstyle.color=never".into(), "-T1".into()];
        args.extend(options.maven_options.iter().cloned());
        if options.offline {
            args.push("-o".into());
@@ -680,4 +683,25 @@ mod tests {
        assert_eq!(error_summary(text), "Failed to execute goal");
        assert_eq!(error_summary("one\nlast line\n\n"), "last line");
    }
+
+    #[cfg(unix)]
+    #[test]
+    fn maven_sync_runs_the_daemon_command_serially() {
+        use std::os::unix::fs::PermissionsExt;
+        let tmp = tempfile::tempdir().unwrap();
+        let root = tmp.path().join("p");
+        std::fs::create_dir_all(&root).unwrap();
+        std::fs::write(root.join("pom.xml"), "<project><groupId>g</groupId><artifactId>a</artifactId></project>")
+            .unwrap();
+        let launcher = tmp.path().join("fake-mvnd");
+        std::fs::write(&launcher, "#!/bin/sh\nprintf '%s\\n' \"$@\" > mvnd-args\n").unwrap();
+        std::fs::set_permissions(&launcher, std::fs::Permissions::from_mode(0o755)).unwrap();
+        let options =
+            SyncOptions { maven_command: Some(launcher.to_string_lossy().into_owned()), ..Default::default() };
+        sync_maven(&root, &tmp.path().join("cache"), &options, &CancellationToken::new(), &|_| {}).unwrap();
+        let args = std::fs::read_to_string(root.join("mvnd-args")).unwrap();
+        // `-T1` pins the daemon serial so the dependency trees stay parseable.
+        assert!(args.contains("-T1"), "args: {args}");
+        assert!(args.contains("help:effective-pom"), "args: {args}");
+    }
 }
@@ -22,4 +22,4 @@ tempfile.workspace = true
 libc = "0.2"

 [target.'cfg(windows)'.dependencies]
-windows-sys = { version = "0.61", features = ["Win32_Globalization", "Win32_Security", "Win32_System_Registry", "Win32_Foundation"] }
+windows-sys = { version = "0.61", features = ["Win32_Globalization", "Win32_Security", "Win32_System_Registry", "Win32_Foundation", "Win32_System_Diagnostics_ToolHelp", "Win32_System_Threading"] }
@@ -2,6 +2,18 @@
 //! treats as nonexistent — hidden from the project view and navigation, never
 //! indexed or searched, never offered as unversioned changes.

+use std::path::Path;
+
+/// Whether `dir` lies in a Git (or jj) working tree: it or an ancestor holds `.git` / `.jj`.
+///
+/// Walkers pass it to `ignore::WalkBuilder::require_git`: inside a repository, `.gitignore`
+/// rules then stop at a nested repository's root as in git, so an outer repository's
+/// `.gitignore` does not hide a project that is its own repository. A folder outside any
+/// repository still honours its `.gitignore`.
+pub fn inside_git_repo(dir: &Path) -> bool {
+    dir.ancestors().any(|d| d.join(".git").exists() || d.join(".jj").exists())
+}
+
 /// IDEA's default list, plus `.jj` and the Windows shell files.
 pub const DEFAULT_IGNORED_NAMES: &[&str] = &[
    "*.pyc",
@@ -103,4 +115,15 @@ mod tests {
        assert!(m.is_ignored_path("pkg/__pycache__/mod.cpython-312.pyc"));
        assert!(!m.is_ignored_path("src/main.rs"));
    }
+
+    #[test]
+    fn finds_the_repository_at_or_above_a_directory() {
+        let dir = tempfile::tempdir().unwrap();
+        let sub = dir.path().join("a/b");
+        std::fs::create_dir_all(&sub).unwrap();
+        assert!(!inside_git_repo(&sub));
+        std::fs::create_dir(dir.path().join("a/.git")).unwrap();
+        assert!(inside_git_repo(&sub));
+        assert!(inside_git_repo(&dir.path().join("a")));
+    }
 }
@@ -36,6 +36,23 @@ impl Default for InspectionSettings {
    }
 }

+impl InspectionSettings {
+    /// Overrides of the profile in effect; `Default`'s when `profile` names none that exists.
+    pub fn active(&self) -> &BTreeMap<String, InspectionOverride> {
+        let custom = |level: &str, key: &str| match level {
+            "ide" => self.ide_profiles.get(key),
+            "project" => self.project_profiles.get(key),
+            _ => None,
+        };
+        match self.profile.as_str() {
+            "project" => &self.project,
+            id => {
+                id.split_once(':').and_then(|(level, key)| custom(level, key)).map_or(&self.default, |p| &p.overrides)
+            }
+        }
+    }
+}
+
 /// A named profile made with Copy.
 #[derive(Clone, Debug, Default, PartialEq, Eq, Serialize, Deserialize, Type)]
 #[serde(default, rename_all = "camelCase")]
@@ -111,4 +128,20 @@ mod tests {
        let back: InspectionSettings = serde_json::from_str(&serde_json::to_string(&s).unwrap()).unwrap();
        assert_eq!(back, s);
    }
+
+    #[test]
+    fn active_profile_falls_back_to_default() {
+        let off = |id: &str| {
+            BTreeMap::from([(id.to_owned(), InspectionOverride { enabled: Some(false), ..Default::default() })])
+        };
+        let mut s = InspectionSettings { default: off("a"), project: off("b"), ..Default::default() };
+        s.ide_profiles.insert("strict".into(), CustomInspectionProfile { name: "Strict".into(), overrides: off("c") });
+        assert!(s.active().contains_key("a"));
+        s.profile = "project".into();
+        assert!(s.active().contains_key("b"));
+        s.profile = "ide:strict".into();
+        assert!(s.active().contains_key("c"));
+        s.profile = "project:gone".into();
+        assert!(s.active().contains_key("a"));
+    }
 }
@@ -43,19 +43,21 @@ pub fn own_group(cmd: &mut Command) -> &mut Command {
 /// Kills the child and everything it started, then reaps it.
 ///
 /// - Unix: `SIGKILL` to its process group, so spawn it with [`own_group`].
-/// - Windows: `taskkill /T /F`, which walks the tree from the child's process id.
+/// - Windows: `taskkill /T /F`, which walks the tree from the child's process id, then a
+///   wait for what the child started to be gone.
 pub fn kill_tree(child: &mut Child) {
    #[cfg(unix)]
    signal_group(child, libc::SIGKILL);
    #[cfg(windows)]
-    taskkill_tree(child);
+    taskkill_tree_of(child.id());
    let _ = child.kill();
    let _ = child.wait();
 }

 /// [`kill_tree`] for a child known by its process id (a `tokio` child): `SIGKILL` to its
-/// process group (spawn it with [`own_group`]) or `taskkill /T /F`. Call it before the child
-/// is reaped, so the id still names it. The child itself is left to its owner to kill and reap.
+/// process group (spawn it with [`own_group`]) or `taskkill /T /F` and a wait for what the
+/// child started to be gone. Call it before the child is reaped, so the id still names it.
+/// The child itself is left to its owner to kill and reap.
 pub fn kill_tree_of(pid: u32) {
    #[cfg(unix)]
    if let Ok(pid) = libc::pid_t::try_from(pid) {
@@ -65,15 +67,7 @@ pub fn kill_tree_of(pid: u32) {
        }
    }
    #[cfg(windows)]
-    {
-        let mut taskkill = Command::new("taskkill");
-        prepare(&mut taskkill)
-            .args(["/T", "/F", "/PID", &pid.to_string()])
-            .stdin(Stdio::null())
-            .stdout(Stdio::null())
-            .stderr(Stdio::null());
-        let _ = taskkill.status();
-    }
+    taskkill_tree_of(pid);
    #[cfg(not(any(unix, windows)))]
    let _ = pid;
 }
@@ -106,15 +100,107 @@ fn signal_group(child: &Child, signal: libc::c_int) {
    }
 }

+/// How long killing a tree waits for the processes the child started to be gone.
 #[cfg(windows)]
-fn taskkill_tree(child: &Child) {
+const TREE_EXIT_WAIT: Duration = Duration::from_secs(5);
+
+/// `taskkill /T /F` from `pid`, then waits (up to [`TREE_EXIT_WAIT`]) until what the child
+/// started is gone: termination is asynchronous, and until a process is gone the files it
+/// holds open can't be opened or deleted. The child itself is left to its owner to reap.
+#[cfg(windows)]
+fn taskkill_tree_of(pid: u32) {
+    let started = windows_tree::descendants(pid);
    let mut taskkill = Command::new("taskkill");
    prepare(&mut taskkill)
-        .args(["/T", "/F", "/PID", &child.id().to_string()])
+        .args(["/T", "/F", "/PID", &pid.to_string()])
        .stdin(Stdio::null())
        .stdout(Stdio::null())
        .stderr(Stdio::null());
    let _ = taskkill.status();
+    windows_tree::wait_all(&started, TREE_EXIT_WAIT);
+}
+
+#[cfg(windows)]
+mod windows_tree {
+    use std::collections::HashSet;
+    use std::os::windows::io::{AsRawHandle, FromRawHandle, OwnedHandle};
+    use std::time::{Duration, Instant};
+    use windows_sys::Win32::Foundation::{FILETIME, INVALID_HANDLE_VALUE};
+    use windows_sys::Win32::System::Diagnostics::ToolHelp::{
+        CreateToolhelp32Snapshot, PROCESSENTRY32W, Process32FirstW, Process32NextW, TH32CS_SNAPPROCESS,
+    };
+    use windows_sys::Win32::System::Threading::{
+        GetProcessTimes, OpenProcess, PROCESS_QUERY_LIMITED_INFORMATION, PROCESS_SYNCHRONIZE, WaitForSingleObject,
+    };
+
+    /// Every process `root` started, directly or not, opened so it can be waited for. A
+    /// parent's id is reused once it is gone, so a process counts only if it started after
+    /// its parent.
+    pub(super) fn descendants(root: u32) -> Vec<OwnedHandle> {
+        let Some(root_started) = open(root).as_ref().and_then(started) else { return Vec::new() };
+        let processes = processes();
+        let mut seen = HashSet::from([root]);
+        let mut parents = vec![(root, root_started)];
+        let mut found = Vec::new();
+        while let Some((parent, parent_started)) = parents.pop() {
+            for &(pid, ppid) in &processes {
+                if ppid != parent || !seen.insert(pid) {
+                    continue;
+                }
+                let Some(handle) = open(pid) else { continue };
+                if let Some(at) = started(&handle).filter(|&at| at >= parent_started) {
+                    parents.push((pid, at));
+                    found.push(handle);
+                }
+            }
+        }
+        found
+    }
+
+    pub(super) fn wait_all(processes: &[OwnedHandle], within: Duration) {
+        let until = Instant::now() + within;
+        for process in processes {
+            let left = until.saturating_duration_since(Instant::now());
+            // SAFETY: a live process handle opened with SYNCHRONIZE access.
+            unsafe { WaitForSingleObject(process.as_raw_handle(), left.as_millis().min(u32::MAX as u128 - 1) as u32) };
+        }
+    }
+
+    /// (process id, parent process id) of every running process.
+    fn processes() -> Vec<(u32, u32)> {
+        let mut out = Vec::new();
+        // SAFETY: a snapshot handle owned here and an entry sized as the API requires.
+        unsafe {
+            let snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
+            if snapshot.is_null() || snapshot == INVALID_HANDLE_VALUE {
+                return out;
+            }
+            let snapshot = OwnedHandle::from_raw_handle(snapshot);
+            let mut entry = PROCESSENTRY32W { dwSize: size_of::<PROCESSENTRY32W>() as u32, ..Default::default() };
+            let mut more = Process32FirstW(snapshot.as_raw_handle(), &mut entry);
+            while more != 0 {
+                out.push((entry.th32ProcessID, entry.th32ParentProcessID));
+                more = Process32NextW(snapshot.as_raw_handle(), &mut entry);
+            }
+        }
+        out
+    }
+
+    fn open(pid: u32) -> Option<OwnedHandle> {
+        // SAFETY: plain call; a non-null result is a process handle owned by the caller.
+        let handle = unsafe { OpenProcess(PROCESS_SYNCHRONIZE | PROCESS_QUERY_LIMITED_INFORMATION, 0, pid) };
+        // SAFETY: as above.
+        (!handle.is_null()).then(|| unsafe { OwnedHandle::from_raw_handle(handle) })
+    }
+
+    /// When the process started, in 100 ns ticks since 1601.
+    fn started(process: &OwnedHandle) -> Option<u64> {
+        let (mut created, mut exited, mut kernel, mut user) =
+            (FILETIME::default(), FILETIME::default(), FILETIME::default(), FILETIME::default());
+        // SAFETY: a live process handle opened with query access; four out-parameters.
+        let ok = unsafe { GetProcessTimes(process.as_raw_handle(), &mut created, &mut exited, &mut kernel, &mut user) };
+        (ok != 0).then(|| (u64::from(created.dwHighDateTime) << 32) | u64::from(created.dwLowDateTime))
+    }
 }

 /// Gives `cmd` the host's environment back when the IDE runs from an AppImage. `AppRun` and
@@ -713,6 +713,15 @@ impl Default for PythonSettings {
 pub struct PhpSettings {
    /// `php` CLI executable; empty = the one on `PATH`.
    pub interpreter: String,
+    /// PHP version the language server checks the code against (`7.4`); empty = from
+    /// `composer.json` (`config.platform.php`, else the lowest version `require.php` allows).
+    pub language_level: String,
+    /// Folders outside the project whose code the language server indexes too (a platform a
+    /// module extends); absolute, `~/`, or relative to the project.
+    pub include_paths: Vec<String>,
+    /// Intelephense stub sets loaded on top of its defaults and the `ext-*` entries of
+    /// `composer.json` (`wordpress`).
+    pub stubs: Vec<String>,
 }

 #[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize, Type)]
@@ -861,6 +870,12 @@ pub struct MavenSettings {
    pub user_settings: String,
    /// Local repository (`-Dmaven.repo.local`); empty = from `settings.xml`.
    pub local_repository: String,
+    /// Run Maven through the Maven Daemon (`mvnd`) for faster builds. mvnd embeds
+    /// its own Maven, so `home` and the project's `mvnw` are bypassed when it is on.
+    pub daemon: bool,
+    /// Maven Daemon home (or its `mvnd` executable); empty = `$MVND_HOME`, else
+    /// `mvnd` on `PATH` / common install dirs. Only used when `daemon` is on.
+    pub mvnd_home: String,
 }

 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Type)]
@@ -1092,6 +1107,17 @@ mod maven_linkage_tests {
        assert!(encoded.contains("unlinkedProjects"));
        assert_eq!(serde_json::from_str::<MavenSettings>(&encoded).unwrap(), settings);
    }
+
+    #[test]
+    fn daemon_settings_round_trip() {
+        // Old settings files predate the daemon fields; `serde(default)` keeps them loadable.
+        let old: MavenSettings = serde_json::from_str(r#"{"home":"/opt/maven"}"#).unwrap();
+        assert!(!old.daemon && old.mvnd_home.is_empty());
+        let settings = MavenSettings { daemon: true, mvnd_home: "/opt/mvnd".into(), ..old };
+        let encoded = serde_json::to_string(&settings).unwrap();
+        assert!(encoded.contains("\"daemon\":true") && encoded.contains("mvndHome"));
+        assert_eq!(serde_json::from_str::<MavenSettings>(&encoded).unwrap(), settings);
+    }
 }

 #[cfg(test)]
@@ -72,7 +72,13 @@ fn builtin(adapter: &str) -> Option<DebuggerConfig> {
            "stdio",
            "Install the Kotlin Debug Adapter from Settings > Language Servers",
        ),
-        "debugpy" => cfg("python3", &["-m", "debugpy.adapter"], "stdio", "pip install debugpy"),
+        // Windows installs `python.exe`; `python3.exe` there is at most a Store alias.
+        "debugpy" => cfg(
+            if cfg!(windows) { "python" } else { "python3" },
+            &["-m", "debugpy.adapter"],
+            "stdio",
+            "pip install debugpy",
+        ),
        "js-debug" => cfg(
            "js-debug-adapter",
            // Without a host it listens on `localhost`, which may resolve to ::1 only.
@@ -589,11 +589,12 @@ impl DebugManager {
        if let Some(command) = custom_command(&spec.command) {
            spec.command = command;
        }
-        // debugpy: run the adapter with the debuggee's interpreter (venvs carry their own debugpy).
+        // debugpy: run the adapter with the debuggee's interpreter (venvs carry their own debugpy),
+        // or with the launcher's when the debuggee runs through a manager (`uv run python`).
        if config.adapter == "debugpy" {
-            let python = match arguments.get("python") {
-                Some(Value::String(p)) => Some(p.clone()),
-                Some(Value::Array(a)) => a.first().and_then(Value::as_str).map(str::to_owned),
+            let python = match (arguments.get("debugLauncherPython"), arguments.get("python")) {
+                (Some(Value::String(p)), _) | (_, Some(Value::String(p))) => Some(p.clone()),
+                (_, Some(Value::Array(a))) => a.first().and_then(Value::as_str).map(str::to_owned),
                _ => None,
            };
            if let Some(python) = python {
@@ -651,8 +652,19 @@ impl DebugManager {
        {
            arguments["project"] = json!(real);
        }
-        if config.adapter == "codelldb" && arguments.get("sourceLanguages").is_none() {
-            arguments["sourceLanguages"] = json!(["rust"]);
+        if config.adapter == "codelldb" {
+            if arguments.get("sourceLanguages").is_none() {
+                arguments["sourceLanguages"] = json!(["rust"]);
+            }
+            // The Debug Console and Evaluate Expression take expressions, as with every other
+            // debugger; LLDB commands still run with a leading backtick.
+            match arguments.get_mut("_adapterSettings") {
+                None => arguments["_adapterSettings"] = json!({"consoleMode": "evaluate"}),
+                Some(Value::Object(settings)) => {
+                    settings.entry("consoleMode").or_insert_with(|| json!("evaluate"));
+                }
+                Some(_) => {}
+            }
        }
        let port = debug_server.map(|s| s.port);
        self.start_session(id, owner, config.name, config.adapter, None, config.request, arguments, spec, port).await
@@ -111,8 +111,8 @@ impl Session {
        if let Some(path) = self.kotlin_mirror.lock().as_ref().and_then(|m| m.adapter_path(path)) {
            return path;
        }
-        if self.adapter == "java-debug" {
-            let native = java_source_path(&path.to_string_lossy());
+        if self.adapter == "java-debug" || (cfg!(windows) && self.adapter == "netcoredbg") {
+            let native = windows_source_path(&path.to_string_lossy());
            self.resolved_paths.lock().insert(native.clone(), path.to_path_buf());
            return native;
        }
@@ -133,7 +133,11 @@ impl Session {
        if let Some(real) = self.kotlin_mirror.lock().as_ref().and_then(|m| m.client_path(Path::new(path))) {
            return Some(real);
        }
-        let key = if self.adapter == "java-debug" { java_source_path(path) } else { PathBuf::from(path) };
+        let key = if self.adapter == "java-debug" || (cfg!(windows) && self.adapter == "netcoredbg") {
+            windows_source_path(path)
+        } else {
+            PathBuf::from(path)
+        };
        self.resolved_paths.lock().get(&key).cloned().or_else(|| {
            (self.adapter == "java-debug" && is_windows_source_path(path))
                .then(|| PathBuf::from(path.replace('\\', "/")))
@@ -265,8 +269,8 @@ impl Session {
    }
 }

-// java-debug treats a forward-slash drive path as a URI (scheme "C").
-// Keep DAP path mode, but use native Windows separators for Java source lookup.
+// java-debug and Windows netcoredbg need native separators for source lookup.
+// Keep DAP path mode, but normalize Windows drive and UNC paths.
 fn is_windows_source_path(path: &str) -> bool {
    let bytes = path.as_bytes();
    (bytes.len() >= 3 && bytes[0].is_ascii_alphabetic() && bytes[1] == b':' && matches!(bytes[2], b'/' | b'\\'))
@@ -274,7 +278,7 @@ fn is_windows_source_path(path: &str) -> bool {
        || path.starts_with(r"\\")
 }

-fn java_source_path(path: &str) -> PathBuf {
+fn windows_source_path(path: &str) -> PathBuf {
    if is_windows_source_path(path) { PathBuf::from(path.replace('/', r"\")) } else { PathBuf::from(path) }
 }

@@ -698,6 +698,37 @@ async fn js_debug_launch_gets_port_and_workspace_folder() {
    assert_eq!(launch["type"], "pwa-node");
 }

+/// CodeLLDB treats console input as LLDB commands unless told otherwise: Evaluate Expression
+/// and the Debug Console send expressions, so its console evaluates them. A launch
+/// configuration that picks a console mode keeps it.
+#[tokio::test]
+async fn codelldb_console_evaluates_expressions() {
+    let launch_with = |extra: Value| async move {
+        let h = harness(Script::default());
+        let config = LaunchConfig {
+            name: "demo".into(),
+            adapter: "codelldb".into(),
+            request: "launch".into(),
+            program: Some("/p/target/debug/demo".into()),
+            args: vec![],
+            cwd: Some("/p".into()),
+            env: BTreeMap::new(),
+            extra_json: Some(extra.to_string()),
+        };
+        h.start(config).await.unwrap();
+        h.request("launch")["arguments"].clone()
+    };
+    let launch = launch_with(json!({})).await;
+    assert_eq!(launch["_adapterSettings"]["consoleMode"], "evaluate");
+    assert_eq!(launch["sourceLanguages"], json!(["rust"]));
+
+    let launch =
+        launch_with(json!({"_adapterSettings": {"consoleMode": "commands", "showDisassembly": "never"}})).await;
+    assert_eq!(launch["_adapterSettings"], json!({"consoleMode": "commands", "showDisassembly": "never"}));
+    let launch = launch_with(json!({"_adapterSettings": {"showDisassembly": "never"}})).await;
+    assert_eq!(launch["_adapterSettings"], json!({"consoleMode": "evaluate", "showDisassembly": "never"}));
+}
+
 /// An adapter that is already listening (java-debug inside jdtls): the client
 /// connects over TCP to the `debugServer` port instead of spawning anything.
 #[tokio::test]
@@ -923,6 +954,7 @@ fn godot_registry(port: u16, command: &str, args: &[&str]) -> Arc<LanguageRegist
        ui_mode: None,
        framework_ui_modes: Vec::new(),
        formatter: None,
+        scratch_template: None,
        tree_sitter: None,
        language_servers: vec![],
        debugger: Some(ide_language::DebuggerConfig {
@@ -1109,6 +1141,23 @@ async fn kotlin_official_release_ten_no_delay_runs() {
    }
 }

+#[cfg(windows)]
+#[tokio::test]
+async fn netcoredbg_windows_source_paths_round_trip() {
+    let client = "D:/work/LoginController.cs";
+    let native = r"D:\work\LoginController.cs";
+    let h = harness(Script { source_path: Some(native.into()), ..Script::default() });
+    let path = PathBuf::from(client);
+    h.manager.set_breakpoints(path.clone(), vec![bp(25)]).await.unwrap();
+    let mut cfg = config();
+    cfg.adapter = "netcoredbg".into();
+    let id = h.start(cfg).await.unwrap();
+    assert_eq!(h.request("setBreakpoints")["arguments"]["source"]["path"], native);
+    let frames = h.manager.stack_trace(id, 1).await.unwrap();
+    assert_eq!(frames[0].path.as_deref(), Some(path.as_path()));
+    h.manager.stop(id).await.unwrap();
+}
+
 #[tokio::test]
 async fn java_windows_source_paths_for_launch_and_attach() {
    for request in ["launch", "attach"] {
@@ -29,3 +29,4 @@ uuid.workspace = true
 [dev-dependencies]
 tokio = { workspace = true, features = ["rt-multi-thread", "macros"] }
 tempfile.workspace = true
+ide-ssh = { workspace = true, features = ["testing"] }
@@ -213,6 +213,8 @@ pub struct DbManager {
    /// App-wide SSH connections and host-key trust.
    ssh: Arc<SshManager>,
    saved_passwords: SecretStore,
+    /// Directory of the global data sources and their saved passwords ([`DbManager::with_global_sources`]).
+    global: Option<(PathBuf, SecretStore)>,
    history: Arc<HistoryStore>,
    /// Records executed statements in the history off the async threads, in order.
    recorder: std::sync::mpsc::Sender<(String, String, f64)>,
@@ -339,6 +341,7 @@ impl DbManager {
        }
        Self {
            saved_passwords: SecretStore::new(passwords, &root),
+            global: None,
            history,
            recorder,
            root,
@@ -351,8 +354,42 @@ impl DbManager {
        }
    }

+    /// Also lists the global data sources stored in `dir` (the app data directory).
+    pub fn with_global_sources(mut self, dir: PathBuf) -> Self {
+        let passwords = self.saved_passwords.scoped(&dir);
+        self.global = Some((dir, passwords));
+        self
+    }
+
+    /// The project's data sources, then the global ones (a project one wins on the same id).
    pub fn sources(&self) -> IdeResult<Vec<DataSource>> {
-        source::load(&self.root)
+        let mut all = source::load(&self.root)?;
+        let global: Vec<_> = self.global_sources().into_iter().filter(|g| all.iter().all(|s| s.id != g.id)).collect();
+        all.extend(global);
+        Ok(all)
+    }
+
+    fn global_sources(&self) -> Vec<DataSource> {
+        let Some((dir, _)) = &self.global else { return Vec::new() };
+        source::load_global(dir).unwrap_or_else(|e| {
+            tracing::warn!("global data sources: {}", e.message);
+            Vec::new()
+        })
+    }
+
+    /// Where the saved passwords of data source `id` live: app-wide for a global one.
+    fn saved_for(&self, id: &str) -> &SecretStore {
+        match &self.global {
+            Some((_, store)) if self.global_sources().iter().any(|s| s.id == id) => store,
+            _ => &self.saved_passwords,
+        }
+    }
+
+    fn store_of(&self, source: &DataSource) -> &SecretStore {
+        match &self.global {
+            Some((_, store)) if source.global => store,
+            _ => &self.saved_passwords,
+        }
    }

    /// The connection settings of target `target` ([`DataSource::resolved`]), with
@@ -372,18 +409,43 @@ impl DbManager {
    }

    /// Saves the data source list; connections of removed or changed sources are closed.
+    /// Global ones (`global`) go to the app-wide list, the others to the project's.
    pub async fn save_sources(&self, sources: Vec<DataSource>) -> IdeResult<()> {
        let old = self.sources().unwrap_or_default();
-        source::save(&self.root, &sources)?;
+        let (global, project): (Vec<_>, Vec<_>) = sources.iter().cloned().partition(|s| s.global);
+        match &self.global {
+            // Rewritten only when it changes: other projects' windows edit the same file.
+            Some((dir, _)) => {
+                if global != old.iter().filter(|s| s.global).cloned().collect::<Vec<_>>() {
+                    source::save_global(dir, &global)?;
+                }
+            }
+            None if !global.is_empty() => return Err(IdeError::invalid("global data sources are not available here")),
+            None => {}
+        }
+        source::save(&self.root, &project)?;
        for o in old {
            match sources.iter().find(|s| s.id == o.id) {
                Some(n) if *n == o => {}
                gone_or_changed => {
-                    if gone_or_changed.is_none() {
-                        for k in [o.id.clone(), secrets::ssh_key(&o.id)] {
-                            self.session_passwords.lock().remove(&k);
-                            self.saved_passwords.delete(&k);
+                    let keys = [o.id.clone(), secrets::ssh_key(&o.id)];
+                    match gone_or_changed {
+                        None => {
+                            for k in &keys {
+                                self.session_passwords.lock().remove(k);
+                                self.store_of(&o).delete(k);
+                            }
                        }
+                        // Made global or project-level: its saved passwords move along.
+                        Some(n) if n.global != o.global => {
+                            for k in &keys {
+                                if let Some(p) = self.store_of(&o).get(k) {
+                                    self.store_of(n).set(k, &p)?;
+                                    self.store_of(&o).delete(k);
+                                }
+                            }
+                        }
+                        Some(_) => {}
                    }
                    self.disconnect_source(&o.id).await;
                }
@@ -395,7 +457,7 @@ impl DbManager {
    /// Remembers `password` for the session, and in the saved passwords when
    /// the data source saves passwords (`None` forgets it).
    pub async fn set_password(&self, id: &str, password: Option<String>, save: bool) -> IdeResult<()> {
-        self.remember(id.to_owned(), password, save).await
+        self.remember(id, id.to_owned(), password, save).await
    }

    /// [`DbManager::set_password`] for the SSH password / key passphrase.
@@ -407,10 +469,10 @@ impl DbManager {
            self.ssh.set_secret(&c, secret, save);
            return Ok(());
        }
-        self.remember(secrets::ssh_key(id), secret, save).await
+        self.remember(id, secrets::ssh_key(id), secret, save).await
    }

-    async fn remember(&self, key: String, secret: Option<String>, save: bool) -> IdeResult<()> {
+    async fn remember(&self, id: &str, key: String, secret: Option<String>, save: bool) -> IdeResult<()> {
        match &secret {
            Some(p) => {
                self.session_passwords.lock().insert(key.clone(), p.clone());
@@ -419,10 +481,11 @@ impl DbManager {
                self.session_passwords.lock().remove(&key);
            }
        }
+        let store = self.saved_for(id);
        let result = match (secret, save) {
-            (Some(p), true) => self.saved_passwords.set(&key, &p),
+            (Some(p), true) => store.set(&key, &p),
            _ => {
-                self.saved_passwords.delete(&key);
+                store.delete(&key);
                Ok(())
            }
        };
@@ -433,18 +496,18 @@ impl DbManager {
        Ok(())
    }

-    async fn secret(&self, key: String, saved: bool) -> Option<String> {
+    async fn secret(&self, source: &DataSource, key: String, saved: bool) -> Option<String> {
        if let Some(p) = self.session_passwords.lock().get(&key) {
            return Some(p.clone());
        }
        if !saved {
            return None;
        }
-        self.saved_passwords.get(&key)
+        self.store_of(source).get(&key)
    }

    async fn password(&self, source: &DataSource) -> Option<String> {
-        match self.secret(source.id.clone(), source.driver != DbDriver::Sqlite && source.save_password).await {
+        match self.secret(source, source.id.clone(), source.driver != DbDriver::Sqlite && source.save_password).await {
            Some(p) => Some(p),
            None => source.url_password(),
        }
@@ -500,7 +563,7 @@ impl DbManager {
        let session = if config.is_empty() {
            let secret = match ssh_secret {
                Some(s) => Some(s),
-                None => self.secret(secrets::ssh_key(&source.id), ssh.save_secret).await,
+                None => self.secret(source, secrets::ssh_key(&source.id), ssh.save_secret).await,
            };
            let target = SshTarget {
                host: ssh.host.clone(),
@@ -1098,6 +1161,81 @@ impl DbManager {
 #[cfg(test)]
 mod tests {
    use super::*;
+    use ide_ssh::secrets::testing::files_containing;
+    use std::path::Path;
+
+    fn manager(dir: &Path) -> DbManager {
+        ide_ssh::secrets::testing::use_memory_store();
+        let data = dir.join("data");
+        let ssh = Arc::new(SshManager::new(data.join("ssh-passwords.json")));
+        DbManager::new(dir.join("project"), data.join("db-passwords.json"), data.join("db-history.json"), ssh)
+    }
+
+    #[tokio::test]
+    async fn saved_passwords_stay_off_disk() {
+        let tmp = tempfile::tempdir().unwrap();
+        manager(tmp.path()).set_password("s1", Some("hunter2-db".into()), true).await.unwrap();
+        manager(tmp.path()).set_ssh_secret("s1", Some("hunter2-tunnel".into()), true).await.unwrap();
+        assert_eq!(files_containing(tmp.path(), "hunter2-db"), Vec::<PathBuf>::new());
+        assert_eq!(files_containing(tmp.path(), "hunter2-tunnel"), Vec::<PathBuf>::new());
+        let reopened = manager(tmp.path());
+        assert_eq!(reopened.secret(&DataSource::default(), "s1".into(), true).await.as_deref(), Some("hunter2-db"));
+        assert_eq!(
+            reopened.secret(&DataSource::default(), secrets::ssh_key("s1"), true).await.as_deref(),
+            Some("hunter2-tunnel")
+        );
+    }
+
+    #[tokio::test]
+    async fn moves_plaintext_passwords_of_older_versions_off_disk() {
+        let tmp = tempfile::tempdir().unwrap();
+        let project = tmp.path().join("project").to_string_lossy().into_owned();
+        let legacy = serde_json::json!({ project: { "s1": "old-db-pw" }, "/other": { "s2": "other-pw" } });
+        std::fs::create_dir_all(tmp.path().join("data")).unwrap();
+        std::fs::write(tmp.path().join("data/db-passwords.json"), legacy.to_string()).unwrap();
+        let m = manager(tmp.path());
+        assert_eq!(m.secret(&DataSource::default(), "s1".into(), true).await.as_deref(), Some("old-db-pw"));
+        assert_eq!(files_containing(tmp.path(), "old-db-pw"), Vec::<PathBuf>::new());
+        assert_eq!(files_containing(tmp.path(), "other-pw"), Vec::<PathBuf>::new());
+        let other = SecretStore::new(tmp.path().join("data/db-passwords.json"), Path::new("/other"));
+        assert_eq!(other.get("s2").as_deref(), Some("other-pw"));
+    }
+
+    #[tokio::test]
+    async fn global_data_sources_are_shared_by_projects_with_their_passwords() {
+        ide_ssh::secrets::testing::use_memory_store();
+        let tmp = tempfile::tempdir().unwrap();
+        let (app, one, two) = (tmp.path().join("app"), tmp.path().join("one"), tmp.path().join("two"));
+        let manager = |root: &std::path::Path| {
+            let ssh = Arc::new(SshManager::new(app.join("ssh-passwords.json")));
+            DbManager::new(root.to_path_buf(), app.join("passwords.json"), app.join("history.json"), ssh)
+                .with_global_sources(app.clone())
+        };
+        let (a, b) = (manager(&one), manager(&two));
+        let source = |id: &str, global: bool| DataSource {
+            id: id.into(),
+            name: id.into(),
+            driver: DbDriver::Postgres,
+            save_password: true,
+            global,
+            ..Default::default()
+        };
+        a.save_sources(vec![source("local", false), source("shared", false)]).await.unwrap();
+        a.set_password("shared", Some("pw".into()), true).await.unwrap();
+        // Made global: listed in the other project too, with its saved password.
+        a.save_sources(vec![source("local", false), source("shared", true)]).await.unwrap();
+        let ids = |m: &DbManager| m.sources().unwrap().into_iter().map(|s| (s.id, s.global)).collect::<Vec<_>>();
+        assert_eq!(ids(&a), [("local".into(), false), ("shared".into(), true)]);
+        assert_eq!(ids(&b), [("shared".into(), true)]);
+        assert_eq!(b.password(&b.source("shared").unwrap()).await.as_deref(), Some("pw"));
+        let project_file = std::fs::read_to_string(one.join(".openidea/data-sources.toml")).unwrap();
+        assert!(!project_file.contains("shared") && !project_file.contains("global"), "{project_file}");
+        assert!(!std::fs::read_to_string(app.join("data-sources.toml")).unwrap().contains("global"));
+        // Made project-level again: gone from the other project, the password stays with it.
+        a.save_sources(vec![source("local", false), source("shared", false)]).await.unwrap();
+        assert!(b.sources().unwrap().is_empty());
+        assert_eq!(a.password(&a.source("shared").unwrap()).await.as_deref(), Some("pw"));
+    }

    #[tokio::test]
    async fn clickhouse_rejects_manual_transactions_and_table_edits_without_connecting() {
@@ -1,20 +1,15 @@
-//! Saved data source passwords, in the app's data directory rather than the OS
-//! credential store (no system prompts). One JSON file for all projects, keyed
-//! by project root, then credential key; owner-only on Unix.
+//! Saved data source passwords, in the OS credential store like the other saved
+//! passwords ([`SecretFile`]). One index file for all projects; each credential is
+//! keyed by project root, then credential key.

-use ide_core::{IdeError, IdeResult};
-use parking_lot::Mutex;
+use ide_core::IdeResult;
+use ide_ssh::secrets::SecretFile;
 use std::collections::BTreeMap;
 use std::path::{Path, PathBuf};

-/// Project root → credential key → secret.
-type Contents = BTreeMap<String, BTreeMap<String, String>>;
-
-/// Serialises read-modify-write across the projects sharing the file.
-static LOCK: Mutex<()> = Mutex::new(());
-
 pub struct SecretStore {
    path: PathBuf,
+    file: SecretFile,
    project: String,
 }

@@ -23,61 +18,41 @@ pub fn ssh_key(id: &str) -> String {
    format!("{id}#ssh")
 }

+fn file_key(project: &str, key: &str) -> String {
+    format!("{project}|{key}")
+}
+
+/// Older versions' file: project root → credential key → secret.
+fn legacy(value: serde_json::Value) -> Option<BTreeMap<String, String>> {
+    let all: BTreeMap<String, BTreeMap<String, String>> = serde_json::from_value(value).ok()?;
+    Some(
+        all.into_iter()
+            .flat_map(|(project, keys)| keys.into_iter().map(move |(k, s)| (file_key(&project, &k), s)))
+            .collect(),
+    )
+}
+
 impl SecretStore {
    pub fn new(path: PathBuf, root: &Path) -> Self {
-        Self { path, project: root.to_string_lossy().into_owned() }
+        let file = SecretFile::with_legacy(path.clone(), legacy);
+        Self { path, file, project: root.to_string_lossy().into_owned() }
+    }
+
+    /// The same file, keyed by `scope` instead (global data sources: the app data directory).
+    pub fn scoped(&self, scope: &Path) -> Self {
+        Self::new(self.path.clone(), scope)
    }

    pub fn get(&self, key: &str) -> Option<String> {
-        let _g = LOCK.lock();
-        self.read().remove(&self.project)?.remove(key)
+        self.file.get(&file_key(&self.project, key))
    }

    pub fn set(&self, key: &str, secret: &str) -> IdeResult<()> {
-        let _g = LOCK.lock();
-        let mut all = self.read();
-        all.entry(self.project.clone()).or_default().insert(key.to_owned(), secret.to_owned());
-        self.write(&all)
+        self.file.set(&file_key(&self.project, key), secret)
    }

    pub fn delete(&self, key: &str) {
-        let _g = LOCK.lock();
-        let mut all = self.read();
-        let Some(project) = all.get_mut(&self.project) else { return };
-        if project.remove(key).is_none() {
-            return;
-        }
-        if project.is_empty() {
-            all.remove(&self.project);
-        }
-        if let Err(e) = self.write(&all) {
-            tracing::warn!("saved passwords: {}", e.message);
-        }
-    }
-
-    fn read(&self) -> Contents {
-        match std::fs::read(&self.path) {
-            Ok(bytes) => serde_json::from_slice(&bytes).unwrap_or_else(|e| {
-                tracing::warn!("saved passwords: {}: {e}", self.path.display());
-                Contents::new()
-            }),
-            Err(_) => Contents::new(),
-        }
-    }
-
-    fn write(&self, all: &Contents) -> IdeResult<()> {
-        let err = |e: std::io::Error| IdeError::unavailable(format!("saved passwords: {e}"));
-        if let Some(dir) = self.path.parent() {
-            std::fs::create_dir_all(dir).map_err(err)?;
-        }
-        let tmp = self.path.with_extension("json.tmp");
-        let mut options = std::fs::OpenOptions::new();
-        options.write(true).create(true).truncate(true);
-        #[cfg(unix)]
-        std::os::unix::fs::OpenOptionsExt::mode(&mut options, 0o600);
-        let bytes = serde_json::to_vec_pretty(all).map_err(|e| IdeError::internal(e.to_string()))?;
-        std::io::Write::write_all(&mut options.open(&tmp).map_err(err)?, &bytes).map_err(err)?;
-        std::fs::rename(&tmp, &self.path).map_err(err)
+        self.file.delete(&file_key(&self.project, key))
    }
 }

@@ -87,6 +62,7 @@ mod tests {

    #[test]
    fn keeps_projects_apart_and_drops_empty_ones() {
+        ide_ssh::secrets::testing::use_memory_store();
        let tmp = tempfile::tempdir().unwrap();
        let file = tmp.path().join("db-passwords.json");
        let a = SecretStore::new(file.clone(), Path::new("/p/a"));
@@ -1,6 +1,7 @@
-//! Data sources: per-project connection settings in `.openidea/data-sources.toml`.
-//! Passwords never go there: saved ones live in [`crate::secrets`], the others
-//! only in memory for the session.
+//! Data sources: per-project connection settings in `.openidea/data-sources.toml`, and
+//! global ones (IDEA's Make Global: listed in every project) in `data-sources.toml` of the
+//! app data directory. Passwords never go there: saved ones live in [`crate::secrets`],
+//! the others only in memory for the session.

 use ide_core::{IdeError, IdeResult, IpcPath, project_dir};
 use serde::{Deserialize, Serialize};
@@ -181,6 +182,9 @@ pub struct DataSource {
    pub options: DbOptions,
    pub introspection: DbIntrospection,
    pub properties: Vec<DbProperty>,
+    /// Stored app-wide and listed in every project. Implied by the file it is read from,
+    /// so not written to it.
+    pub global: bool,
 }

 impl Default for DataSource {
@@ -209,6 +213,7 @@ impl Default for DataSource {
            options: DbOptions::default(),
            introspection: DbIntrospection::default(),
            properties: Vec::new(),
+            global: false,
        }
    }
 }
@@ -397,9 +402,32 @@ struct SourcesFile {
    sources: Vec<DataSource>,
 }

+/// The project's data sources.
 pub fn load(root: &Path) -> IdeResult<Vec<DataSource>> {
-    let path = project_dir::path(root, FILE);
-    let text = match std::fs::read_to_string(&path) {
+    read(&project_dir::path(root, FILE))
+}
+
+/// Saves the project's data sources.
+pub fn save(root: &Path, sources: &[DataSource]) -> IdeResult<()> {
+    write(&project_dir::path(root, FILE), sources)
+}
+
+/// The global data sources stored in `dir` (the app data directory).
+pub fn load_global(dir: &Path) -> IdeResult<Vec<DataSource>> {
+    let mut sources = read(&dir.join(FILE))?;
+    for s in &mut sources {
+        s.global = true;
+    }
+    Ok(sources)
+}
+
+/// Saves the global data sources in `dir`.
+pub fn save_global(dir: &Path, sources: &[DataSource]) -> IdeResult<()> {
+    write(&dir.join(FILE), sources)
+}
+
+fn read(path: &Path) -> IdeResult<Vec<DataSource>> {
+    let text = match std::fs::read_to_string(path) {
        Ok(t) => t,
        Err(e) if e.kind() == std::io::ErrorKind::NotFound => return Ok(Vec::new()),
        Err(e) => return Err(e.into()),
@@ -408,19 +436,23 @@ pub fn load(root: &Path) -> IdeResult<Vec<DataSource>> {
    Ok(file.sources)
 }

-pub fn save(root: &Path, sources: &[DataSource]) -> IdeResult<()> {
+fn write(path: &Path, sources: &[DataSource]) -> IdeResult<()> {
    for s in sources {
        if s.id.is_empty() || s.name.trim().is_empty() {
            return Err(IdeError::invalid("every data source needs an id and a name"));
        }
    }
-    let path = project_dir::path(root, FILE);
    if let Some(dir) = path.parent() {
        std::fs::create_dir_all(dir)?;
    }
-    let text = toml::to_string_pretty(&SourcesFile { sources: sources.to_vec() })
-        .map_err(|e| IdeError::internal(e.to_string()))?;
-    std::fs::write(path, text)?;
+    let internal = |e: &dyn std::fmt::Display| IdeError::internal(e.to_string());
+    let mut value = toml::Value::try_from(SourcesFile { sources: sources.to_vec() }).map_err(|e| internal(&e))?;
+    if let Some(list) = value.get_mut("data-source").and_then(toml::Value::as_array_mut) {
+        for table in list.iter_mut().filter_map(toml::Value::as_table_mut) {
+            table.remove("global");
+        }
+    }
+    std::fs::write(path, toml::to_string_pretty(&value).map_err(|e| internal(&e))?)?;
    Ok(())
 }

@@ -364,7 +364,7 @@ pub fn package_hash(dir: &Path, files: &[PathBuf]) -> std::io::Result<String> {
    sorted.dedup();
    let mut hasher = blake3::Hasher::new();
    for rel in sorted {
-        hasher.update(rel.to_string_lossy().as_bytes());
+        hasher.update(hashed_path(rel).as_bytes());
        hasher.update(&[0]);
        hasher.update_reader(std::fs::File::open(dir.join(rel))?)?;
        hasher.update(&[0]);
@@ -372,6 +372,12 @@ pub fn package_hash(dir: &Path, files: &[PathBuf]) -> std::io::Result<String> {
    Ok(hasher.finalize().to_hex().to_string())
 }

+/// A package-relative path as hashed: `/`-separated on every OS, so a package has one digest
+/// (a walked `web\index.html` on Windows is `web/index.html` everywhere else).
+fn hashed_path(rel: &Path) -> String {
+    rel.components().map(|c| c.as_os_str().to_string_lossy()).collect::<Vec<_>>().join("/")
+}
+
 #[cfg(test)]
 mod tests {
    use super::*;
@@ -480,4 +486,20 @@ mod tests {
        let groups = by_risk(&caps(&["storage", "process:git", "net:x.io"]));
        assert_eq!(groups.iter().map(|g| g.0).collect::<Vec<_>>(), [Risk::High, Risk::Medium, Risk::Low]);
    }
+
+    #[test]
+    fn hashes_paths_with_forward_slashes_on_every_os() {
+        assert_eq!(hashed_path(Path::new("web/index.html")), "web/index.html");
+        assert_eq!(hashed_path(Path::new("plugin.wasm")), "plugin.wasm");
+        #[cfg(windows)]
+        assert_eq!(hashed_path(Path::new(r"web\index.html")), "web/index.html");
+        let tmp = tempfile::tempdir().unwrap();
+        std::fs::create_dir(tmp.path().join("web")).unwrap();
+        std::fs::write(tmp.path().join("web").join("index.html"), "<p>").unwrap();
+        // A walked path (native separators) hashes like the manifest's `/` spelling.
+        assert_eq!(
+            package_hash(tmp.path(), &[Path::new("web").join("index.html")]).unwrap(),
+            package_hash(tmp.path(), &["web/index.html".into()]).unwrap()
+        );
+    }
 }
@@ -27,8 +27,8 @@ mod when;
 pub use capability::{Capability, CapabilityInfo, Risk, host_matches};
 pub use index::ContributionIndex;
 pub use manifest::{
-    ActivationEvent, Capabilities, ENGINE_VERSION, EVENT_KINDS, LEGACY_API, MANIFEST_FILE, Manifest, check_relative,
-    engine_compatible, validate_item_id, validate_plugin_id, validate_point_id,
+    ActivationEvent, CATEGORIES, Capabilities, ENGINE_VERSION, EVENT_KINDS, LEGACY_API, MANIFEST_FILE, MAX_CATEGORIES,
+    Manifest, check_relative, engine_compatible, validate_item_id, validate_plugin_id, validate_point_id,
 };
 pub use point::{Commit, Disposable, ExtensionPoint, MAX_PACKAGE_FILE, Package, Placement, Prepared, decode};
 pub use registry::{ContributionInfo, ExtensionRegistry, PreparedSet};
@@ -35,6 +35,11 @@ pub const MANIFEST_FILE: &str = "plugin.toml";
 pub const ENGINE_VERSION: &str = "1.0.0";
 /// The 0.1 API, still accepted for contribution-only packages and 0.1 components.
 pub const LEGACY_API: &str = "0.1";
+/// Marketplace categories, in the order they are shown.
+pub const CATEGORIES: &[&str] =
+    &["languages", "themes", "icon-themes", "linters", "vcs", "ai", "frameworks", "tools", "other"];
+/// Categories a plugin is listed under; later ones are ignored.
+pub const MAX_CATEGORIES: usize = 3;

 #[derive(Clone, Debug, PartialEq)]
 pub struct Manifest {
@@ -47,6 +52,8 @@ pub struct Manifest {
    pub license: Option<String>,
    /// Release notes of this version (Settings › Plugins › What's New).
    pub change_notes: Option<String>,
+    /// Marketplace categories as declared (see [`Manifest::categories`]).
+    pub declared_categories: Vec<String>,
    /// `engines.openidea` (a semver requirement), or the legacy `openidea-api`.
    pub engine: String,
    /// Written in the 0.1 format.
@@ -166,6 +173,8 @@ struct Raw {
    #[serde(default)]
    change_notes: Option<String>,
    #[serde(default)]
+    categories: Vec<String>,
+    #[serde(default)]
    engines: Option<Engines>,
    /// 0.1 format.
    #[serde(default)]
@@ -243,6 +252,7 @@ impl Manifest {
            homepage: raw.homepage,
            license: raw.license,
            change_notes: raw.change_notes,
+            declared_categories: raw.categories,
            engine,
            legacy,
            wasm: raw.wasm,
@@ -290,6 +300,9 @@ impl Manifest {
                return Err(format!("duplicate activation event {event}"));
            }
        }
+        for c in &self.declared_categories {
+            validate_item_id(c, "category")?;
+        }
        for (point, decls) in &self.contributes {
            validate_point_id(point)?;
            if !matches!(decls, toml::Value::Array(_) | toml::Value::Table(_)) {
@@ -325,6 +338,39 @@ impl Manifest {
    }
 }

+impl Manifest {
+    /// Its marketplace categories, in [`CATEGORIES`] order: the first
+    /// [`MAX_CATEGORIES`] declared that this IDE knows; without any, those its
+    /// contributions imply (themes, icon themes, languages), else `other`.
+    pub fn categories(&self) -> Vec<String> {
+        let pick = |f: &dyn Fn(&str) -> bool| CATEGORIES.iter().filter(|c| f(c)).map(|c| c.to_string()).collect();
+        let mut known: Vec<&str> = Vec::new();
+        for d in &self.declared_categories {
+            if CATEGORIES.contains(&d.as_str()) && !known.contains(&d.as_str()) && known.len() < MAX_CATEGORIES {
+                known.push(d);
+            }
+        }
+        let mut out: Vec<String> = pick(&|c| known.contains(&c));
+        if out.is_empty() {
+            out = pick(&|c| match c {
+                "themes" => self.contributes.contains_key("themes"),
+                "icon-themes" => self.contributes.contains_key("iconThemes"),
+                "languages" => self.contributes.contains_key("languages"),
+                _ => false,
+            });
+        }
+        if out.is_empty() {
+            out.push("other".into());
+        }
+        out
+    }
+
+    /// Declared categories this IDE doesn't know (ignored).
+    pub fn unknown_categories(&self) -> Vec<&str> {
+        self.declared_categories.iter().map(String::as_str).filter(|c| !CATEGORIES.contains(c)).collect()
+    }
+}
+
 /// Whether this host can load a plugin written for `engine`.
 pub fn engine_compatible(engine: &str, legacy: bool) -> bool {
    if legacy {
@@ -417,6 +463,26 @@ mod tests {
        assert!(ActivationEvent::parse("on-event:scheduled").is_err(), "declared with on-schedule");
    }

+    #[test]
+    fn categories_are_declared_or_implied() {
+        let head = "id = \"acme.x\"\nname = \"X\"\nversion = \"1.0.0\"\nengines.openidea = \"^1.0\"\n";
+        let m = |rest: &str| Manifest::parse(&format!("{head}{rest}"));
+        // Declared, in the catalogue's order; unknown ones (a newer IDE's) are ignored.
+        let declared = m("categories = [\"tools\", \"vcs\", \"robots\"]\n").unwrap();
+        assert_eq!(declared.categories(), ["vcs", "tools"]);
+        assert_eq!(declared.unknown_categories(), ["robots"]);
+        // None declared: implied by the contributions, else `other`.
+        let theme = m("[[contributes.themes]]\nid = \"t\"\n[[contributes.languages]]\nid = \"l\"\n").unwrap();
+        assert_eq!(theme.categories(), ["languages", "themes"]);
+        let declared_wins = m("categories = [\"tools\"]\n[[contributes.languages]]\nid = \"l\"\n").unwrap();
+        assert_eq!(declared_wins.categories(), ["tools"]);
+        assert_eq!(m("").unwrap().categories(), ["other"]);
+        // At most three: the first ones declared.
+        let many = m("categories = [\"vcs\", \"ai\", \"vcs\", \"tools\", \"themes\"]\n").unwrap();
+        assert_eq!(many.categories(), ["vcs", "ai", "tools"]);
+        assert!(m("categories = [\"Bad Name\"]\n").is_err());
+    }
+
    #[test]
    fn parses_the_02_format() {
        let m = Manifest::parse(FULL).unwrap();
@@ -9,9 +9,19 @@
 //!   proves who published the bytes; whether to trust that publisher is the
 //!   index's call.
 //! - **Index** (`index.json`): the publishers and their keys (the trust root),
-//!   the published plugins, and revocations. A publisher owns the id prefix
-//!   `<publisher>.`; a revoked key invalidates everything it signed, a
-//!   revoked plugin version is disabled where it is installed.
+//!   the published plugin versions, and revocations. A publisher owns the id
+//!   prefix `<publisher>.`; a revoked key invalidates everything it signed, a
+//!   revoked plugin version is disabled where it is installed. A plugin may be
+//!   listed in several versions, each with the plugin API it needs: the IDE
+//!   offers the newest one it can load.
+//! - **Key continuity**: an installed plugin updates silently only to a
+//!   package signed with the same key, or with a key the installed one
+//!   endorsed ([`Endorsement`], a publisher rotating keys); any other signer
+//!   is the user's call. An IDE can pin a publisher to keys it was built with
+//!   ([`Index::pin_publisher`]): the index then can't replace them.
+//! - **Format**: fields are only ever added (IDEs ignore those they don't
+//!   know); `format` grows only for changes older IDEs can't read, and they
+//!   still apply such an index's revocations ([`Index::parse`]).

 use crate::MANIFEST_FILE;
 use base64::Engine as _;
@@ -40,6 +50,24 @@ fn signed_message(id: &str, version: &str, digest: &str) -> Vec<u8> {
    format!("openidea-plugin/1\n{id}\n{version}\n{digest}").into_bytes()
 }

+fn endorsement_message(publisher: &str, key: &str) -> Vec<u8> {
+    format!("openidea-key/1\n{publisher}\n{key}").into_bytes()
+}
+
+/// Whether `signature` (base64) is `key`'s (base64) Ed25519 signature of
+/// `message`; malformed keys and signatures are errors.
+fn verify_ed25519(key: &str, message: &[u8], signature: &str) -> Result<bool, String> {
+    let key: [u8; 32] = B64
+        .decode(key)
+        .ok()
+        .and_then(|b| b.try_into().ok())
+        .ok_or_else(|| "signature: malformed public key".to_owned())?;
+    let key = VerifyingKey::from_bytes(&key).map_err(|_| "signature: invalid public key".to_owned())?;
+    let sig: [u8; 64] =
+        B64.decode(signature).ok().and_then(|b| b.try_into().ok()).ok_or_else(|| "signature: malformed".to_owned())?;
+    Ok(key.verify_strict(message, &Signature::from_bytes(&sig)).is_ok())
+}
+
 /// `SIGNATURE.json` of a signed package.
 #[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
@@ -74,6 +102,12 @@ impl PublisherKey {
        B64.encode(self.0.verifying_key().to_bytes())
    }

+    /// Vouches for `publisher`'s new key `key` (base64), the one that follows this one.
+    pub fn endorse(&self, publisher: &str, key: &str) -> Endorsement {
+        let sig = self.0.sign(&endorsement_message(publisher, key));
+        Endorsement { key: self.public_base64(), signature: B64.encode(sig.to_bytes()) }
+    }
+
    pub fn sign(&self, publisher: &str, id: &str, version: &str, digest: &str) -> PackageSignature {
        let sig = self.0.sign(&signed_message(id, version, digest));
        PackageSignature {
@@ -88,19 +122,11 @@ impl PackageSignature {
    /// Whether the signature is valid for `id`, `version` and `digest` (the
    /// key's validity is checked against an [`Index`]).
    pub fn check(&self, id: &str, version: &str, digest: &str) -> Result<(), String> {
-        let key: [u8; 32] = B64
-            .decode(&self.key)
-            .ok()
-            .and_then(|b| b.try_into().ok())
-            .ok_or_else(|| "signature: malformed public key".to_owned())?;
-        let key = VerifyingKey::from_bytes(&key).map_err(|_| "signature: invalid public key".to_owned())?;
-        let sig: [u8; 64] = B64
-            .decode(&self.signature)
-            .ok()
-            .and_then(|b| b.try_into().ok())
-            .ok_or_else(|| "signature: malformed".to_owned())?;
-        key.verify_strict(&signed_message(id, version, digest), &Signature::from_bytes(&sig))
-            .map_err(|_| "the signature does not match the package (it was changed after signing)".to_owned())
+        if verify_ed25519(&self.key, &signed_message(id, version, digest), &self.signature)? {
+            Ok(())
+        } else {
+            Err("the signature does not match the package (it was changed after signing)".to_owned())
+        }
    }
 }

@@ -242,6 +268,10 @@ pub struct Index {
    pub plugins: Vec<IndexEntry>,
    #[serde(default)]
    pub revoked: Vec<Revocation>,
+    /// The marketplace moved: its index is at this URL (relative to this
+    /// one, or absolute), and the IDE reads that one instead.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub moved: Option<String>,
 }

 #[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize, specta::Type)]
@@ -253,7 +283,7 @@ pub struct Publisher {
    pub keys: Vec<KeyEntry>,
 }

-#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize, specta::Type)]
+#[derive(Clone, Debug, Default, PartialEq, Eq, Serialize, Deserialize, specta::Type)]
 #[serde(rename_all = "camelCase")]
 pub struct KeyEntry {
    /// Ed25519 public key, base64.
@@ -261,6 +291,27 @@ pub struct KeyEntry {
    /// Packages signed with it are no longer trusted.
    #[serde(default)]
    pub revoked: bool,
+    /// The publisher's earlier key vouching for this one.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub endorsement: Option<Endorsement>,
+}
+
+impl KeyEntry {
+    pub fn new(key: String) -> Self {
+        Self { key, ..Self::default() }
+    }
+}
+
+/// A publisher's earlier key vouching for a newer one: plugins installed from
+/// packages signed with the earlier key update to ones signed with the newer
+/// key without asking the user.
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize, specta::Type)]
+#[serde(rename_all = "camelCase")]
+pub struct Endorsement {
+    /// The endorsing key, base64.
+    pub key: String,
+    /// Its Ed25519 signature of `openidea-key/1\n<publisher>\n<endorsed key>`, base64.
+    pub signature: String,
 }

 /// A published plugin version.
@@ -281,6 +332,34 @@ pub struct IndexEntry {
    pub digest: String,
    #[serde(default)]
    pub capabilities: Vec<String>,
+    /// The plugin API versions it loads in (a semver requirement): its
+    /// manifest's `engines.openidea` and the API its component was built for.
+    /// Required: an entry without one is offered to no IDE.
+    #[serde(default)]
+    pub engine: String,
+    /// Marketplace categories (`CATEGORIES`); an IDE ignores those it doesn't know.
+    #[serde(default)]
+    pub categories: Vec<String>,
+}
+
+impl IndexEntry {
+    /// Whether this IDE can load the version.
+    pub fn compatible(&self) -> bool {
+        crate::engine_compatible(&self.engine, false)
+    }
+
+    fn semver(&self) -> Option<semver::Version> {
+        semver::Version::parse(&self.version).ok()
+    }
+}
+
+/// `engines.openidea` of a manifest narrowed to the API its component was built
+/// for (`major.minor`, if it has code): the requirement an index lists.
+pub fn engine_requirement(manifest_engine: &str, built_for: Option<&semver::Version>) -> String {
+    match built_for {
+        Some(v) => format!("{manifest_engine}, ^{}.{}", v.major, v.minor),
+        None => manifest_engine.to_owned(),
+    }
 }

 /// A plugin (all versions when `versions` is empty) that must not run.
@@ -294,12 +373,71 @@ pub struct Revocation {
 }

 impl Index {
+    /// Parses an index. One in a newer format keeps what must reach every IDE —
+    /// revocations, publisher keys (revoked ones) and `moved` — and lists no
+    /// plugins ([`Index::is_newer`]): the IDE needs updating to install from it.
    pub fn parse(text: &str) -> Result<Self, String> {
-        let index: Index = serde_json::from_str(text).map_err(|e| format!("index: {e}"))?;
-        if index.format != INDEX_FORMAT {
-            return Err(format!("index format {} is not supported (this IDE reads {INDEX_FORMAT})", index.format));
+        let value: serde_json::Value = serde_json::from_str(text).map_err(|e| format!("index: {e}"))?;
+        let format = value.get("format").and_then(serde_json::Value::as_u64).ok_or("index: `format` is missing")?;
+        if format == u64::from(INDEX_FORMAT) {
+            return serde_json::from_value(value).map_err(|e| format!("index: {e}"));
        }
-        Ok(index)
+        if format < u64::from(INDEX_FORMAT) {
+            return Err(format!("index format {format} is not supported (this IDE reads {INDEX_FORMAT})"));
+        }
+        fn each<T: serde::de::DeserializeOwned>(value: &serde_json::Value, field: &str) -> Vec<T> {
+            let items = value.get(field).and_then(serde_json::Value::as_array);
+            items.into_iter().flatten().filter_map(|v| serde_json::from_value(v.clone()).ok()).collect()
+        }
+        Ok(Index {
+            format: u32::try_from(format).unwrap_or(u32::MAX),
+            publishers: each(&value, "publishers"),
+            plugins: Vec::new(),
+            revoked: each(&value, "revoked"),
+            moved: value.get("moved").and_then(serde_json::Value::as_str).map(str::to_owned),
+        })
+    }
+
+    /// Written in a format newer than this IDE reads: it lists no plugins.
+    pub fn is_newer(&self) -> bool {
+        self.format > INDEX_FORMAT
+    }
+
+    /// The version of each plugin to offer, and whether this IDE can load it:
+    /// the newest it can load, else the newest. Revoked versions are skipped;
+    /// plugins come in the order they are first listed.
+    pub fn offered(&self) -> Vec<(&IndexEntry, bool)> {
+        let mut ids: Vec<&str> = Vec::new();
+        for e in &self.plugins {
+            if !ids.contains(&e.id.as_str()) {
+                ids.push(&e.id);
+            }
+        }
+        ids.into_iter()
+            .filter_map(|id| {
+                let versions: Vec<&IndexEntry> =
+                    self.plugins.iter().filter(|e| e.id == id && self.revocation(id, &e.version).is_none()).collect();
+                let newest = |loadable: bool| {
+                    versions.iter().copied().filter(|e| !loadable || e.compatible()).max_by_key(|e| e.semver())
+                };
+                newest(true).map(|e| (e, true)).or_else(|| newest(false).map(|e| (e, false)))
+            })
+            .collect()
+    }
+
+    /// Drops the versions no IDE would pick: revoked ones, and of each plugin
+    /// all but the newest version per API requirement.
+    pub fn prune_versions(&mut self) {
+        let plugins = std::mem::take(&mut self.plugins);
+        let mut kept: Vec<IndexEntry> = Vec::new();
+        for e in plugins.into_iter().filter(|e| self.revocation(&e.id, &e.version).is_none()) {
+            match kept.iter_mut().find(|k| k.id == e.id && k.engine == e.engine) {
+                Some(k) if e.semver() > k.semver() => *k = e,
+                Some(_) => {}
+                None => kept.push(e),
+            }
+        }
+        self.plugins = kept;
    }

    /// The revocation that applies to `id` at `version`.
@@ -335,6 +473,127 @@ impl Index {
        sig.check(id, version, digest)?;
        Ok(publisher.id.clone())
    }
+
+    /// Whether `to` is `from`, or a key of `publisher` that `from` endorsed,
+    /// directly or through keys it endorsed. Endorsements by revoked keys don't
+    /// count: whoever stole a key could vouch for their own.
+    pub fn succeeds(&self, publisher: &str, from: &str, to: &str) -> bool {
+        let keys = self.publishers.iter().find(|p| p.id == publisher).map_or(&[][..], |p| &p.keys[..]);
+        let mut key = to;
+        // Each step moves to an earlier key; more steps than keys is a loop.
+        for _ in 0..=keys.len() {
+            if key == from {
+                return true;
+            }
+            let Some(e) = keys.iter().find(|k| k.key == key).and_then(|k| k.endorsement.as_ref()) else {
+                return false;
+            };
+            let endorser_valid = keys.iter().any(|k| k.key == e.key && !k.revoked);
+            if !endorser_valid || verify_ed25519(&e.key, &endorsement_message(publisher, key), &e.signature) != Ok(true)
+            {
+                return false;
+            }
+            key = &e.key;
+        }
+        false
+    }
+
+    /// Makes `roots` (base64) the keys `publisher` signs with, whatever this
+    /// index says: another key it lists stays only when a root endorsed it (a
+    /// rotation the roots vouched for). Revocations of the keys are kept.
+    pub fn pin_publisher(&mut self, publisher: &str, name: &str, roots: &[String]) {
+        if roots.is_empty() {
+            return;
+        }
+        let i = match self.publishers.iter().position(|p| p.id == publisher) {
+            Some(i) => i,
+            None => {
+                self.publishers.push(Publisher { id: publisher.into(), name: name.into(), keys: Vec::new() });
+                self.publishers.len() - 1
+            }
+        };
+        for root in roots {
+            if !self.publishers[i].keys.iter().any(|k| &k.key == root) {
+                self.publishers[i].keys.push(KeyEntry::new(root.clone()));
+            }
+        }
+        let keys = self.publishers[i].keys.clone();
+        let trusted = keys
+            .into_iter()
+            .filter(|k| roots.iter().any(|r| self.succeeds(publisher, r, &k.key)))
+            .map(|k| if roots.contains(&k.key) { KeyEntry { endorsement: None, ..k } } else { k })
+            .collect();
+        self.publishers[i].keys = trusted;
+    }
+
+    /// Replaces what this index lists for every publisher but `keep` with what
+    /// `other` lists: its publishers, their plugins and their revocations
+    /// (`other`'s downloads should already be absolute). `other` may only
+    /// speak for its own publishers, and none of them may be in `keep`.
+    pub fn include(&mut self, other: Index, keep: &[&str]) -> Result<(), String> {
+        let mut theirs: Vec<&str> = Vec::new();
+        for p in &other.publishers {
+            if !publisher_id_ok(&p.id) {
+                return Err(format!("invalid publisher id {:?}: use a-z, 0-9, '-' and '_'", p.id));
+            }
+            if keep.contains(&p.id.as_str()) {
+                return Err(format!("may not list publisher {:?}", p.id));
+            }
+            if theirs.contains(&p.id.as_str()) {
+                return Err(format!("publisher {:?} is listed twice", p.id));
+            }
+            theirs.push(&p.id);
+        }
+        let owned_by = |id: &str| theirs.iter().any(|p| owns(p, id));
+        for e in &other.plugins {
+            if !theirs.contains(&e.publisher.as_str()) || !owns(&e.publisher, &e.id) {
+                return Err(format!("{}: not a plugin of publisher {:?}", e.id, e.publisher));
+            }
+            if semver::VersionReq::parse(&e.engine).is_err() {
+                return Err(format!("{} {}: `engine` must be the plugin API it needs", e.id, e.version));
+            }
+        }
+        if let Some(r) = other.revoked.iter().find(|r| !owned_by(&r.id)) {
+            return Err(format!("{}: revoked by an index that doesn't publish it", r.id));
+        }
+        let kept = |id: &str| keep.iter().any(|p| owns(p, id));
+        self.publishers.retain(|p| keep.contains(&p.id.as_str()));
+        self.plugins.retain(|e| keep.contains(&e.publisher.as_str()));
+        self.revoked.retain(|r| kept(&r.id));
+        self.publishers.extend(other.publishers);
+        self.plugins.extend(other.plugins);
+        self.revoked.extend(other.revoked);
+        Ok(())
+    }
+}
+
+/// Whether a package signed `new` (`None`: unsigned) may replace an installed
+/// one signed `installed` without asking the user: signed with the same key,
+/// or with one the installed key endorsed (per `index`). An unsigned installed
+/// copy pins nothing.
+pub fn signer_continues(
+    index: Option<&Index>,
+    installed: Option<&PackageSignature>,
+    new: Option<&PackageSignature>,
+) -> bool {
+    match (installed, new) {
+        (None, _) => true,
+        (Some(_), None) => false,
+        (Some(old), Some(new)) => {
+            old.publisher == new.publisher
+                && (old.key == new.key || index.is_some_and(|i| i.succeeds(&new.publisher, &old.key, &new.key)))
+        }
+    }
+}
+
+/// Whether the plugin `id` is in `publisher`'s namespace.
+fn owns(publisher: &str, id: &str) -> bool {
+    id.strip_prefix(publisher).is_some_and(|rest| rest.starts_with('.'))
+}
+
+/// A publisher id is a single segment of a plugin id.
+pub fn publisher_id_ok(id: &str) -> bool {
+    !id.contains('.') && crate::validate_plugin_id(id).is_ok()
 }

 #[cfg(test)]
@@ -354,7 +613,7 @@ mod tests {
            publishers: vec![Publisher {
                id: "acme".into(),
                name: "ACME".into(),
-                keys: vec![KeyEntry { key: key.public_base64(), revoked: false }],
+                keys: vec![KeyEntry::new(key.public_base64())],
            }],
            plugins: Vec::new(),
            revoked: vec![Revocation {
@@ -362,6 +621,7 @@ mod tests {
                versions: vec!["1.0.0".into()],
                reason: "malware".into(),
            }],
+            moved: None,
        }
    }

@@ -399,6 +659,138 @@ mod tests {
        assert_eq!(PublisherKey::from_base64(&key.seed_base64()).unwrap().public_base64(), key.public_base64());
    }

+    fn entry(id: &str, publisher: &str) -> IndexEntry {
+        IndexEntry {
+            id: id.into(),
+            name: id.into(),
+            version: "1.0.0".into(),
+            description: String::new(),
+            authors: Vec::new(),
+            publisher: publisher.into(),
+            download: format!("https://example.com/{id}.oiplugin"),
+            digest: "d".into(),
+            capabilities: Vec::new(),
+            engine: "^1.0".into(),
+            categories: Vec::new(),
+        }
+    }
+
+    fn version(id: &str, version: &str, engine: &str) -> IndexEntry {
+        IndexEntry { version: version.into(), engine: engine.into(), ..entry(id, "acme") }
+    }
+
+    #[test]
+    fn the_ide_is_offered_the_newest_version_it_can_load() {
+        let host = crate::ENGINE_VERSION;
+        let newer = semver::Version::parse(host).unwrap().major + 1;
+        let mut index = Index {
+            format: INDEX_FORMAT,
+            plugins: vec![
+                version("acme.a", "1.0.0", &format!("^{host}")),
+                version("acme.a", "1.2.0", &format!("^{host}")),
+                version("acme.a", "2.0.0", &format!("^{newer}.0")),
+                version("acme.b", "0.1.0", &format!("^{newer}.0")),
+                version("acme.b", "0.2.0", &format!("^{newer}.1")),
+                version("acme.c", "1.0.0", ""),
+                version("acme.c", "1.1.0", ""),
+            ],
+            revoked: vec![Revocation { id: "acme.c".into(), versions: vec!["1.1.0".into()], reason: "r".into() }],
+            ..Index::default()
+        };
+        let offered = |index: &Index| {
+            index.offered().into_iter().map(|(e, ok)| (e.id.clone(), e.version.clone(), ok)).collect::<Vec<_>>()
+        };
+        let expected = [
+            ("acme.a".to_owned(), "1.2.0".to_owned(), true),
+            ("acme.b".to_owned(), "0.2.0".to_owned(), false),
+            // No `engine`: listed, but no IDE installs it.
+            ("acme.c".to_owned(), "1.0.0".to_owned(), false),
+        ];
+        assert_eq!(offered(&index), expected);
+
+        // Pruning keeps the newest version per requirement, which changes nothing offered.
+        index.prune_versions();
+        let left: Vec<_> = index.plugins.iter().map(|e| format!("{} {}", e.id, e.version)).collect();
+        assert_eq!(left, ["acme.a 1.2.0", "acme.a 2.0.0", "acme.b 0.1.0", "acme.b 0.2.0", "acme.c 1.0.0"]);
+        assert_eq!(offered(&index), expected);
+
+        let built_for = semver::Version::new(1, 3, 0);
+        assert_eq!(engine_requirement("^1.0", Some(&built_for)), "^1.0, ^1.3");
+        assert_eq!(engine_requirement("^1.0", None), "^1.0");
+        assert!(semver::VersionReq::parse(&engine_requirement("^1.0", Some(&built_for))).is_ok());
+    }
+
+    fn publisher(id: &str) -> Publisher {
+        Publisher { id: id.into(), name: id.into(), keys: vec![KeyEntry::new(format!("{id}-key"))] }
+    }
+
+    fn revocation(id: &str) -> Revocation {
+        Revocation { id: id.into(), versions: Vec::new(), reason: "r".into() }
+    }
+
+    #[test]
+    fn including_an_index_replaces_everything_but_the_kept_publishers() {
+        let mut official = Index {
+            format: INDEX_FORMAT,
+            publishers: vec![publisher("openidea"), publisher("gone")],
+            plugins: vec![entry("openidea.a", "openidea"), entry("gone.x", "gone")],
+            revoked: vec![revocation("openidea.old"), revocation("gone.x")],
+            moved: None,
+        };
+        let community = Index {
+            format: INDEX_FORMAT,
+            publishers: vec![publisher("alice")],
+            plugins: vec![entry("alice.arthas", "alice")],
+            revoked: vec![revocation("alice.bad")],
+            moved: None,
+        };
+        official.include(community.clone(), &["openidea"]).unwrap();
+        let ids = |v: &[IndexEntry]| v.iter().map(|e| e.id.clone()).collect::<Vec<_>>();
+        assert_eq!(official.publishers.iter().map(|p| p.id.as_str()).collect::<Vec<_>>(), ["openidea", "alice"]);
+        assert_eq!(ids(&official.plugins), ["openidea.a", "alice.arthas"]);
+        assert_eq!(official.revoked.iter().map(|r| r.id.as_str()).collect::<Vec<_>>(), ["openidea.old", "alice.bad"]);
+
+        // Including again is idempotent.
+        let once = official.clone();
+        official.include(community.clone(), &["openidea"]).unwrap();
+        assert_eq!(official, once);
+    }
+
+    #[test]
+    fn an_included_index_speaks_only_for_its_own_publishers() {
+        let base = Index { format: INDEX_FORMAT, publishers: vec![publisher("openidea")], ..Index::default() };
+        let with = |publishers: Vec<Publisher>, plugins: Vec<IndexEntry>, revoked: Vec<Revocation>| Index {
+            format: INDEX_FORMAT,
+            publishers,
+            plugins,
+            revoked,
+            moved: None,
+        };
+        let cases = [
+            (with(vec![publisher("openidea")], vec![], vec![]), "may not list"),
+            (with(vec![publisher("alice"), publisher("alice")], vec![], vec![]), "listed twice"),
+            (with(vec![publisher("openidea.x")], vec![], vec![]), "invalid publisher"),
+            (with(vec![publisher("alice")], vec![entry("openidea.a", "alice")], vec![]), "not a plugin of"),
+            (with(vec![publisher("alice")], vec![entry("alice.a", "bob")], vec![]), "not a plugin of"),
+            (with(vec![publisher("alice")], vec![entry("alicex.a", "alice")], vec![]), "not a plugin of"),
+            (with(vec![publisher("alice")], vec![], vec![revocation("openidea.a")]), "doesn't publish"),
+            (
+                with(
+                    vec![publisher("alice")],
+                    vec![IndexEntry { engine: String::new(), ..entry("alice.a", "alice") }],
+                    vec![],
+                ),
+                "`engine`",
+            ),
+        ];
+        for (other, error) in cases {
+            let mut index = base.clone();
+            let err = index.include(other, &["openidea"]).unwrap_err();
+            assert!(err.contains(error), "{err}");
+            assert_eq!(index, base);
+        }
+    }
+
    #[test]
    fn unpacking_refuses_paths_leaving_the_package() {
        let tmp = tempfile::tempdir().unwrap();
@@ -413,7 +805,7 @@ mod tests {
        let err = unpack(&out, &tmp.path().join("dest")).unwrap_err();
        assert!(err.contains("invalid path"), "{err}");
        assert!(!tmp.path().join("outside.txt").exists());
-        assert!(Index::parse(r#"{"format": 2}"#).is_err());
+        assert!(Index::parse(r#"{"format": 2}"#).unwrap().is_newer());
    }

    fn zip_of(path: &Path, entries: &[(&str, &str)]) {
@@ -462,4 +854,102 @@ mod tests {
            assert!(err.contains("is not an OpenIDEA plugin"), "{name}: {err}");
        }
    }
+
+    #[test]
+    fn a_newer_index_still_revokes_and_moves() {
+        let newer = format!(
+            r#"{{"format": {}, "plugins": [{{"anything": "new"}}], "shape": "changed",
+                "publishers": [{{"id": "acme", "name": "ACME", "keys": [{{"key": "k1", "revoked": true}}]}}, {{"id": 5}}],
+                "revoked": [{{"id": "acme.bad", "reason": "malware"}}, {{"oops": 1}}],
+                "moved": "https://example.com/next.json"}}"#,
+            INDEX_FORMAT + 1
+        );
+        let index = Index::parse(&newer).unwrap();
+        assert!(index.is_newer());
+        assert!(index.plugins.is_empty() && index.offered().is_empty());
+        assert_eq!(index.revocation("acme.bad", "2.0.0").unwrap().reason, "malware");
+        assert!(index.key_revoked("k1"));
+        assert_eq!(index.moved.as_deref(), Some("https://example.com/next.json"));
+        // Fields this IDE doesn't know are ignored in its own format.
+        let current = format!(r#"{{"format": {INDEX_FORMAT}, "later": true, "plugins": []}}"#);
+        assert!(!Index::parse(&current).unwrap().is_newer());
+        assert!(Index::parse(r#"{"format": 0}"#).unwrap_err().contains("not supported"));
+        assert!(Index::parse(r#"{"plugins": []}"#).is_err());
+    }
+
+    fn keys<'a>(index: &'a mut Index, publisher: &str) -> &'a mut Vec<KeyEntry> {
+        &mut index.publishers.iter_mut().find(|p| p.id == publisher).unwrap().keys
+    }
+
+    #[test]
+    fn rotated_keys_continue_through_endorsements() {
+        let (k1, k2, k3) =
+            (PublisherKey::from_seed([1; 32]), PublisherKey::from_seed([2; 32]), PublisherKey::from_seed([3; 32]));
+        let mut index = index(&k1);
+        let endorsed = |by: &PublisherKey, key: &PublisherKey| KeyEntry {
+            endorsement: Some(by.endorse("acme", &key.public_base64())),
+            ..KeyEntry::new(key.public_base64())
+        };
+        keys(&mut index, "acme").push(endorsed(&k1, &k2));
+        keys(&mut index, "acme").push(endorsed(&k2, &k3));
+        let (p1, p2, p3) = (k1.public_base64(), k2.public_base64(), k3.public_base64());
+        assert!(index.succeeds("acme", &p1, &p1));
+        assert!(index.succeeds("acme", &p1, &p3), "through k2");
+        assert!(!index.succeeds("acme", &p3, &p1), "not backwards");
+        assert!(!index.succeeds("other", &p1, &p2));
+        // An endorsement for another publisher, or by a revoked key, doesn't count.
+        let mut foreign = index.clone();
+        keys(&mut foreign, "acme")[1].endorsement = Some(k1.endorse("evil", &p2));
+        assert!(!foreign.succeeds("acme", &p1, &p2));
+        let mut stolen = index.clone();
+        keys(&mut stolen, "acme")[0].revoked = true;
+        assert!(!stolen.succeeds("acme", &p1, &p2));
+
+        let sig = |key: &PublisherKey| key.sign("acme", "acme.tools", "1.0.0", "d");
+        assert!(signer_continues(Some(&index), Some(&sig(&k1)), Some(&sig(&k3))));
+        assert!(signer_continues(None, Some(&sig(&k1)), Some(&sig(&k1))));
+        assert!(!signer_continues(None, Some(&sig(&k1)), Some(&sig(&k2))), "no index to vouch");
+        let stranger = PublisherKey::from_seed([4; 32]);
+        assert!(!signer_continues(Some(&index), Some(&sig(&k1)), Some(&sig(&stranger))));
+        assert!(!signer_continues(Some(&index), Some(&sig(&k1)), None), "signed, then unsigned");
+        assert!(signer_continues(Some(&index), None, Some(&sig(&stranger))), "unsigned pins nothing");
+    }
+
+    #[test]
+    fn pinned_publishers_keep_their_built_in_keys() {
+        let (root, next, intruder) =
+            (PublisherKey::from_seed([1; 32]), PublisherKey::from_seed([2; 32]), PublisherKey::from_seed([5; 32]));
+        let mut index = index(&intruder);
+        index.publishers[0].id = "openidea".into();
+        keys(&mut index, "openidea").push(KeyEntry {
+            endorsement: Some(root.endorse("openidea", &next.public_base64())),
+            ..KeyEntry::new(next.public_base64())
+        });
+        let roots = [root.public_base64()];
+        let listed = |index: &Index| -> Vec<(String, bool)> {
+            let mut index = index.clone();
+            index.pin_publisher("openidea", "OpenIDEA", &roots);
+            keys(&mut index, "openidea").iter().map(|k| (k.key.clone(), k.revoked)).collect()
+        };
+        // The intruder's key goes, the successor the root endorsed stays, the root is added.
+        assert_eq!(listed(&index), [(next.public_base64(), false), (root.public_base64(), false)]);
+        let mut pinned = index.clone();
+        pinned.pin_publisher("openidea", "OpenIDEA", &roots);
+        let digest = "d";
+        let signed = |k: &PublisherKey| k.sign("openidea", "openidea.tools", "1.0.0", digest);
+        assert!(pinned.verify(&signed(&intruder), "openidea.tools", "1.0.0", digest).is_err());
+        assert!(pinned.verify(&signed(&next), "openidea.tools", "1.0.0", digest).is_ok());
+        // A revoked root stays revoked, and what it endorsed is no longer trusted.
+        keys(&mut index, "openidea").push(KeyEntry { revoked: true, ..KeyEntry::new(root.public_base64()) });
+        assert_eq!(listed(&index), [(root.public_base64(), true)]);
+
+        // A publisher missing from the index is added with its roots.
+        let mut empty = Index { format: INDEX_FORMAT, ..Index::default() };
+        empty.pin_publisher("openidea", "OpenIDEA", &[root.public_base64()]);
+        assert_eq!(empty.verify(&signed(&root), "openidea.tools", "1.0.0", digest).unwrap(), "openidea");
+        // No roots: the index decides.
+        let mut open = index.clone();
+        open.pin_publisher("openidea", "OpenIDEA", &[]);
+        assert_eq!(open, index);
+    }
 }
@@ -21,6 +21,18 @@ pub struct FontFamily {
    pub monospaced: bool,
 }

+/// PANOSE bProportion value 9 means "Monospaced"; DirectWrite's
+/// `IsMonospacedFont` alone misses fonts that only carry this classification.
+const PANOSE_MONOSPACED: u8 = 9;
+
+/// One face counts as monospaced when the font system flags it fixed pitch, its
+/// PANOSE proportion is "Monospaced", or its glyph advances are uniform
+/// (fonts with wrong/missing metadata, e.g. bitmap-style TTFs).
+#[cfg_attr(not(windows), allow(dead_code))]
+fn face_is_mono(is_monospaced_font: bool, panose_proportion: u8, advances_equal: bool) -> bool {
+    is_monospaced_font || panose_proportion == PANOSE_MONOSPACED || advances_equal
+}
+
 type Cache = Mutex<Option<Arc<[FontFamily]>>>;

 /// The installed families, sorted case-insensitively, read on first use and
@@ -195,7 +207,9 @@ mod imp {
        // SAFETY: CoreText descriptors carry documented CFString, CFURL and trait dictionary values.
        unsafe {
            let collection = CTFontCollection::from_available_fonts(None);
-            let Some(descriptors) = collection.matching_font_descriptors() else { return Vec::new() };
+            let Some(descriptors) = collection.matching_font_descriptors() else {
+                return Vec::new();
+            };
            let mut seen = std::collections::BTreeSet::new();
            descriptors
                .cast_unchecked::<CTFontDescriptor>()
@@ -271,14 +285,16 @@ mod imp {

 #[cfg(windows)]
 mod imp {
+    use std::os::windows::ffi::OsStrExt;
+    use windows::Win32::Graphics::DirectWrite::IDWriteFontFace1;
    use windows::Win32::Graphics::DirectWrite::{
-        DWRITE_FACTORY_TYPE_SHARED, DWRITE_FONT_STRETCH_NORMAL, DWRITE_FONT_STYLE_NORMAL, DWRITE_FONT_WEIGHT_NORMAL,
-        DWriteCreateFactory, IDWriteFactory, IDWriteFont1, IDWriteLocalizedStrings,
+        DWRITE_FACTORY_TYPE_SHARED, DWriteCreateFactory, IDWriteFactory, IDWriteFactory3, IDWriteFactory5, IDWriteFont,
+        IDWriteFont1, IDWriteFontCollection, IDWriteFontFamily, IDWriteLocalizedStrings,
    };
-    use windows::core::{BOOL, Interface, w};
+    use windows::core::{BOOL, Interface, PCWSTR, w};

-    /// The system font collection's families, named in English when the
-    /// family has an English name (what CSS matches), else its first name.
+    /// The installed families, named in English when the family has an
+    /// English name (what CSS matches), else its first name.
    pub(crate) fn list(refresh: bool) -> Vec<(String, bool)> {
        // SAFETY: plain DirectWrite COM calls on interfaces we own.
        unsafe { read(refresh) }.unwrap_or_default()
@@ -286,11 +302,85 @@ mod imp {

    unsafe fn read(refresh: bool) -> windows::core::Result<Vec<(String, bool)>> {
        let factory: IDWriteFactory = unsafe { DWriteCreateFactory(DWRITE_FACTORY_TYPE_SHARED) }?;
+        let mut faces = Vec::new();
+        // Windows 10+: the newer collection covers registered per-user fonts.
+        // Exclude downloadable fonts that are not installed on this machine.
+        // Bitmap .FON fonts (e.g. the stock raster Fixedsys) are invisible to
+        // DirectWrite either way: it only reads TrueType/OpenType files.
        let mut collection = None;
-        unsafe { factory.GetSystemFontCollection(&mut collection, refresh) }?;
-        let Some(collection) = collection else {
-            return Ok(Vec::new());
+        if let Ok(factory3) = factory.cast::<IDWriteFactory3>() {
+            let mut local = None;
+            if unsafe { factory3.GetSystemFontCollection(false, &mut local, refresh) }.is_ok() {
+                collection = local.map(Into::into);
+            }
+        }
+        if collection.is_none() {
+            unsafe { factory.GetSystemFontCollection(&mut collection, refresh) }?;
+        }
+        if let Some(collection) = collection {
+            faces.extend(collect(&collection));
+        }
+        // DirectWrite enumerates via the font registry, so font files copied
+        // into the per-user directory without registering (no HKCU entry)
+        // are invisible to the calls above; scan the directory directly.
+        faces.extend(unsafe { user_dir_faces(&factory) });
+        Ok(faces)
+    }
+
+    /// Families from `%LOCALAPPDATA%\Microsoft\Windows\Fonts` files, registered
+    /// or not, via a font set built from the files on disk.
+    unsafe fn user_dir_faces(factory: &IDWriteFactory) -> Vec<(String, bool)> {
+        let Some(local_app_data) = std::env::var_os("LOCALAPPDATA") else {
+            return Vec::new();
        };
+        let dir = std::path::Path::new(&local_app_data).join(r"Microsoft\Windows\Fonts");
+        let Ok(entries) = std::fs::read_dir(&dir) else {
+            return Vec::new();
+        };
+        let files: Vec<_> = entries
+            .filter_map(|e| e.ok())
+            .map(|e| e.path())
+            .filter(|p| {
+                matches!(
+                    p.extension().and_then(|e| e.to_str()).map(|e| e.to_ascii_lowercase()).as_deref(),
+                    Some("ttf" | "otf" | "ttc" | "otc")
+                )
+            })
+            .collect();
+        unsafe { file_faces(factory, &files) }
+    }
+
+    unsafe fn file_faces(factory: &IDWriteFactory, files: &[std::path::PathBuf]) -> Vec<(String, bool)> {
+        if files.is_empty() {
+            return Vec::new();
+        }
+        let Ok(factory3) = factory.cast::<IDWriteFactory3>() else {
+            return Vec::new();
+        };
+        let Ok(factory5) = factory.cast::<IDWriteFactory5>() else {
+            return Vec::new();
+        };
+        let Ok(builder) = (unsafe { factory5.CreateFontSetBuilder() }) else {
+            return Vec::new();
+        };
+        for path in files {
+            let wide: Vec<u16> = path.as_os_str().encode_wide().chain(Some(0)).collect();
+            // SAFETY: wide is a valid NUL-terminated string for the calls.
+            let Ok(file) = (unsafe { factory.CreateFontFileReference(PCWSTR(wide.as_ptr()), None) }) else {
+                continue;
+            };
+            let _ = unsafe { builder.AddFontFile(&file) };
+        }
+        let Ok(set) = (unsafe { builder.CreateFontSet() }) else {
+            return Vec::new();
+        };
+        let Ok(collection) = (unsafe { factory3.CreateFontCollectionFromFontSet(&set) }) else {
+            return Vec::new();
+        };
+        collect(&collection)
+    }
+
+    fn collect(collection: &IDWriteFontCollection) -> Vec<(String, bool)> {
        let mut out = Vec::new();
        for i in 0..unsafe { collection.GetFontFamilyCount() } {
            let Ok(family) = (unsafe { collection.GetFontFamily(i) }) else {
@@ -299,19 +389,120 @@ mod imp {
            let Some(name) = unsafe { family.GetFamilyNames() }.ok().and_then(|n| unsafe { english(&n) }) else {
                continue;
            };
-            let mono = unsafe {
-                family.GetFirstMatchingFont(
-                    DWRITE_FONT_WEIGHT_NORMAL,
-                    DWRITE_FONT_STRETCH_NORMAL,
-                    DWRITE_FONT_STYLE_NORMAL,
-                )
-            }
-            .ok()
-            .and_then(|f| f.cast::<IDWriteFont1>().ok())
-            .is_some_and(|f| unsafe { f.IsMonospacedFont() }.as_bool());
-            out.push((name, mono));
+            out.push((name, unsafe { family_is_mono(&family) }));
+        }
+        out
+    }
+
+    /// A family is monospaced when any face reports fixed pitch, PANOSE
+    /// proportion 9, or uniform glyph advances; probing every face matches
+    /// `normalize`'s any-face merge (macOS and Linux already flag every face,
+    /// not just the regular one).
+    unsafe fn family_is_mono(family: &IDWriteFontFamily) -> bool {
+        (0..unsafe { family.GetFontCount() }).any(|i| {
+            let Ok(font) = (unsafe { family.GetFont(i) }) else {
+                return false;
+            };
+            if let Ok(font1) = font.cast::<IDWriteFont1>() {
+                let is_monospaced = unsafe { font1.IsMonospacedFont() }.as_bool();
+                // The proportion byte is defined for text/display fonts only.
+                let panose = unsafe { font1.GetPanose().values };
+                let panose_proportion = if panose[0] == 2 { panose[3] } else { 0 };
+                if super::face_is_mono(is_monospaced, panose_proportion, false) {
+                    return true;
+                }
+            }
+            unsafe { advances_equal(&font) }
+        })
+    }
+
+    /// Some monospaced fonts carry no fixed-pitch metadata at all (bitmap-style
+    /// TTFs like Fixedsys Excelsior): compare the advance widths of 'i' and
+    /// 'W'. Dual-width CJK monospace fonts pass too (both half-width).
+    unsafe fn advances_equal(font: &IDWriteFont) -> bool {
+        let Ok(face) = (unsafe { font.CreateFontFace() }) else {
+            return false;
+        };
+        let Ok(face1) = face.cast::<IDWriteFontFace1>() else {
+            return false;
+        };
+        let codepoints = ['i' as u32, 'W' as u32];
+        let mut indices = [0u16; 2];
+        if unsafe { face.GetGlyphIndices(codepoints.as_ptr(), 2, indices.as_mut_ptr()) }.is_err()
+            || indices.contains(&0)
+        {
+            return false;
+        }
+        let mut advances = [0i32; 2];
+        unsafe { face1.GetDesignGlyphAdvances(2, indices.as_ptr(), advances.as_mut_ptr(), false) }.is_ok()
+            && advances[0] > 0
+            && advances[0] == advances[1]
+    }
+
+    #[test]
+    fn glyph_probe_distinguishes_monospace_proportional_and_symbol_fonts() {
+        unsafe {
+            let factory: IDWriteFactory = DWriteCreateFactory(DWRITE_FACTORY_TYPE_SHARED).unwrap();
+            let mut collection = None;
+            factory.GetSystemFontCollection(&mut collection, false).unwrap();
+            let collection = collection.unwrap();
+            for (name, expected) in [
+                ("Consolas", true),
+                ("Arial", false),
+                ("Times New Roman", false),
+                ("Wingdings", false),
+                ("Webdings", false),
+                ("Segoe MDL2 Assets", false),
+            ] {
+                let wide: Vec<_> = name.encode_utf16().chain(Some(0)).collect();
+                let mut index = 0;
+                let mut exists = BOOL(0);
+                collection.FindFamilyName(PCWSTR(wide.as_ptr()), &mut index, &mut exists).unwrap();
+                assert!(exists.as_bool(), "{name} ships with Windows");
+                let family = collection.GetFontFamily(index).unwrap();
+                for i in 0..family.GetFontCount() {
+                    let font = family.GetFont(i).unwrap();
+                    assert_eq!(advances_equal(&font), expected, "{name} face {i}");
+                }
+            }
+        }
+    }
+
+    #[test]
+    fn font_files_include_every_family_in_a_collection() {
+        let path = std::path::PathBuf::from(std::env::var_os("WINDIR").unwrap()).join(r"Fonts\cambria.ttc");
+        unsafe {
+            let factory: IDWriteFactory = DWriteCreateFactory(DWRITE_FACTORY_TYPE_SHARED).unwrap();
+            let faces = file_faces(&factory, &[path]);
+            for name in ["Cambria", "Cambria Math"] {
+                assert!(faces.iter().any(|(family, _)| family == name), "missing {name}: {faces:?}");
+            }
+        }
+    }
+
+    #[test]
+    fn excludes_families_available_only_as_downloads() {
+        use windows::Win32::Graphics::DirectWrite::{DWRITE_E_REMOTEFONT, DWRITE_LOCALITY_LOCAL, IDWriteFont3};
+
+        unsafe {
+            let factory: IDWriteFactory = DWriteCreateFactory(DWRITE_FACTORY_TYPE_SHARED).unwrap();
+            let factory3: IDWriteFactory3 = factory.cast().unwrap();
+            let set = factory3.GetSystemFontSet().unwrap();
+            let collection = factory3.CreateFontCollectionFromFontSet(&set).unwrap();
+            let listed = super::normalize(read(false).unwrap());
+            let user = super::normalize(user_dir_faces(&factory));
+            for i in 0..collection.GetFontFamilyCount() {
+                let family = collection.GetFontFamily(i).unwrap();
+                let name = english(&family.GetFamilyNames().unwrap()).unwrap();
+                let remote_only = (0..family.GetFontCount()).all(|j| match family.GetFont(j) {
+                    Ok(font) => font.cast::<IDWriteFont3>().unwrap().GetLocality() != DWRITE_LOCALITY_LOCAL,
+                    Err(error) => error.code() == DWRITE_E_REMOTEFONT,
+                });
+                if remote_only && !user.iter().any(|f| f.name == name) {
+                    assert!(!listed.iter().any(|f| f.name == name), "{name} is not installed locally");
+                }
+            }
        }
-        Ok(out)
    }

    unsafe fn english(names: &IDWriteLocalizedStrings) -> Option<String> {
@@ -476,6 +667,15 @@ mod tests {
        );
    }

+    #[test]
+    fn panose_monospaced_proportion_counts_as_mono() {
+        assert!(face_is_mono(true, 0, false));
+        assert!(face_is_mono(false, PANOSE_MONOSPACED, false));
+        assert!(face_is_mono(false, 0, true));
+        assert!(!face_is_mono(false, 0, false));
+        assert!(!face_is_mono(false, 3, false));
+    }
+
    #[test]
    fn fc_list_spacing_marks_monospace() {
        let out = "DejaVu Sans Mono\t100\nDejaVu Sans\t\nNoto Sans Mono CJK SC\t90\nTerminus\t110\nCantarell\nFira\\-Code\tmono\n\t100\n";
@@ -46,6 +46,7 @@ ide-extension.workspace = true
 ide-plugin.workspace = true
 ide-tools = { path = "../ide-tools" }
 ide-docker = { path = "../ide-docker" }
+semver = "1"
 serde.workspace = true
 serde_json.workspace = true
 toml.workspace = true
@@ -3,13 +3,15 @@
 //! ```text
 //! openidea-plugin new <dir> [--template command|theme|icon-theme|language] [--id ID] [--name NAME] [--sdk PATH]
 //! openidea-plugin build [dir] [--debug]   # cargo → dist/plugin.wasm, then `check`
-//! openidea-plugin check [dir]             # validate the package as the IDE would install it
+//! openidea-plugin check [dir|package]     # validate the package as the IDE would install it
 //! openidea-plugin link [dir]              # load the folder in the IDE without installing it
 //! openidea-plugin unlink [dir]
 //! openidea-plugin links                   # list linked folders
 //! openidea-plugin keygen <key-file>       # a publisher's Ed25519 key
+//! openidea-plugin endorse <new-public-key> --key OLD --publisher ID   # vouch for a new key
 //! openidea-plugin pack [dir] [--key F --publisher ID] [--out FILE]   # <id>-<version>.oiplugin
-//! openidea-plugin index <dir> --publisher ID --name NAME --key F     # marketplace index.json
+//! openidea-plugin index <dir> [--publisher ID --name NAME --key F [--previous-key F]]   # marketplace index.json
+//! openidea-plugin merge <index> <other-index> --keep ID               # list another index's publishers
 //! ```
 //!
 //! `link` writes `links.json` in the IDE's plugins directory
@@ -20,7 +22,7 @@
 mod templates;

 use ide_extension::{Manifest, validate_plugin_id};
-use ide_host::plugins::PluginHost;
+use ide_host::plugins::{PluginHost, read_market_url, resolve_market_href};
 use ide_plugin::{Limits, PluginEngine};
 use std::path::{Path, PathBuf};
 use std::process::{Command, ExitCode};
@@ -31,17 +33,31 @@ usage: openidea-plugin <command> [options]

 commands:
  new <dir> [--template T] [--id ID] [--name NAME] [--sdk PATH]
-        create a plugin; T = command (default), theme, icon-theme, language
+        create a plugin; T = command (default), theme, icon-theme, language. A Rust
+        plugin depends on the SDK of this tool's release (git); --sdk PATH uses a
+        local sdk/rust/openidea-plugin instead
  build [dir] [--debug]   compile a Rust plugin to dist/plugin.wasm and check it
-  check [dir]             validate the package as the IDE would install it
+  check [dir|package]     validate the package (folder or .oiplugin) as the IDE would install it
  link [dir]              load the folder in the IDE without installing it
  unlink [dir]            stop loading a linked folder
  links                   list linked folders
  keygen <key-file>       create a publisher signing key (keep the file secret)
+  endorse <new-public-key> --key F --publisher ID
+                          print an earlier key's endorsement of a new one (JSON), for an
+                          index the publisher doesn't write with `index --previous-key`
  pack [dir] [--key F --publisher ID] [--out FILE]
                          write <id>-<version>.oiplugin, signed with the key
-  index <dir> --publisher ID --name NAME --key F [--out FILE]
-                          write the marketplace index.json for the packages in dir
+  index <dir> [--publisher ID --name NAME --key F [--previous-key F]] [--out FILE]
+        [--download-base URL]
+                          write the marketplace index.json for the packages in dir: with a
+                          key, register it and list that publisher's plugins (earlier
+                          versions stay for older IDEs); without, list only these packages,
+                          each checked against the index's publishers. A new key replacing
+                          an earlier one is endorsed with --previous-key, so installed
+                          plugins update to it without asking
+  merge <index> <other-index> --keep ID [--out FILE]
+                          replace every publisher but ID in index with those of other-index
+                          (a path or URL), their plugins and revocations

 environment:
  OPENIDEA_PLUGINS_DIR    the IDE's plugins directory (default: the app data directory)";
@@ -51,13 +67,15 @@ fn main() -> ExitCode {
    let result = match args.first().map(String::as_str) {
        Some("new") => cmd_new(&args[1..]),
        Some("build") => cmd_build(&args[1..]),
-        Some("check") => dir_arg(&args[1..]).and_then(|d| check(&d)),
+        Some("check") => dir_arg(&args[1..]).and_then(|d| check_path(&d)),
        Some("link") => dir_arg(&args[1..]).and_then(|d| link(&d, true)),
        Some("unlink") => dir_arg(&args[1..]).and_then(|d| link(&d, false)),
        Some("links") => list_links(),
        Some("keygen") => cmd_keygen(&args[1..]),
+        Some("endorse") => cmd_endorse(&args[1..]),
        Some("pack") => cmd_pack(&args[1..]),
        Some("index") => cmd_index(&args[1..]),
+        Some("merge") => cmd_merge(&args[1..]),
        Some("--version" | "-V") => {
            println!("openidea-plugin {} (plugin API {})", env!("CARGO_PKG_VERSION"), ide_extension::ENGINE_VERSION);
            Ok(())
@@ -161,7 +179,7 @@ fn cmd_new(args: &[String]) -> Result<(), String> {
    std::fs::create_dir_all(&dir).map_err(|e| format!("{}: {e}", dir.display()))?;
    let dir = canonical(&dir)?;
    let sdk = match template {
-        templates::Template::Command => Some(sdk_path(a.value("sdk"), &dir)?),
+        templates::Template::Command => Some(sdk_dependency(a.value("sdk"), &dir)?),
        _ => None,
    };
    let vars = templates::Vars { id: &id, name: &name, sdk: sdk.as_deref() };
@@ -216,12 +234,16 @@ fn title_case(s: &str) -> String {
        .join(" ")
 }

-/// The SDK dependency path written into a new plugin's Cargo.toml: `--sdk`,
-/// or the SDK of the source tree this tool was built from.
-fn sdk_path(explicit: Option<&str>, plugin_dir: &Path) -> Result<String, String> {
+/// The SDK dependency written into a new plugin's Cargo.toml: by path with `--sdk`, or
+/// when the plugin is inside the source tree this tool was built from; otherwise the
+/// repository at this tool's release tag.
+fn sdk_dependency(explicit: Option<&str>, plugin_dir: &Path) -> Result<String, String> {
    let sdk = match explicit {
        Some(p) => PathBuf::from(p),
-        None => PathBuf::from(concat!(env!("CARGO_MANIFEST_DIR"), "/../../sdk/rust/openidea-plugin")),
+        None => match dunce::canonicalize(concat!(env!("CARGO_MANIFEST_DIR"), "/../..")) {
+            Ok(tree) if plugin_dir.starts_with(&tree) => tree.join("sdk/rust/openidea-plugin"),
+            _ => return Ok(format!("{{ git = \"{REPOSITORY}\", tag = \"v{}\" }}", env!("CARGO_PKG_VERSION"))),
+        },
    };
    let sdk = dunce::canonicalize(&sdk).map_err(|_| {
        format!("the plugin SDK was not found at {}; pass --sdk <path to sdk/rust/openidea-plugin>", sdk.display())
@@ -230,9 +252,11 @@ fn sdk_path(explicit: Option<&str>, plugin_dir: &Path) -> Result<String, String>
        return Err(format!("{} is not the openidea-plugin SDK (no Cargo.toml)", sdk.display()));
    }
    let path = relative(plugin_dir, &sdk).unwrap_or(sdk);
-    Ok(path.to_string_lossy().replace('\\', "/"))
+    Ok(format!("{{ path = \"{}\" }}", path.to_string_lossy().replace('\\', "/")))
 }

+const REPOSITORY: &str = "https://github.com/l0ng-ai/openidea";
+
 /// `to` relative to `from` when they share a root (keeps packages in a repo movable).
 fn relative(from: &Path, to: &Path) -> Option<PathBuf> {
    let (f, t): (Vec<_>, Vec<_>) = (from.components().collect(), to.components().collect());
@@ -323,10 +347,21 @@ fn ensure_wasm_target() {

 /// Validates `dir` exactly as Install from Disk would, and checks the
 /// component imports only the plugin API.
+/// [`check`] of a folder, or of a package file unpacked as installing would.
+fn check_path(path: &Path) -> Result<(), String> {
+    if !path.is_file() {
+        return check(path);
+    }
+    let tmp = scratch_dir("unpack")?;
+    let dir = tmp.path().join("package");
+    package::unpack(path, &dir).and_then(|_| check(&dir))
+}
+
 fn check(dir: &Path) -> Result<(), String> {
    let dir = canonical(dir)?;
-    let scratch = std::env::temp_dir().join(format!("openidea-plugin-check-{}", std::process::id()));
-    let result = (|| {
+    let tmp = scratch_dir("check")?;
+    let scratch = tmp.path().join("host");
+    (|| {
        let host = PluginHost::new(scratch.clone(), Arc::new(|_: Option<&str>, _| {}), Limits::default())
            .map_err(|e| e.to_string())?;
        let preview = host.preview_install(&dir).map_err(|e| e.to_string())?;
@@ -345,6 +380,17 @@ fn check(dir: &Path) -> Result<(), String> {
        } else {
            println!("  code: none (contributions only)");
        }
+        println!("  categories: {}", manifest.categories().join(", "));
+        for c in manifest.unknown_categories() {
+            println!("  warning: unknown category {c:?} (ignored); use {}", ide_extension::CATEGORIES.join(", "));
+        }
+        if manifest.declared_categories.len() > ide_extension::MAX_CATEGORIES {
+            println!(
+                "  warning: only the first {} known categories are used; {} are declared",
+                ide_extension::MAX_CATEGORIES,
+                manifest.declared_categories.len()
+            );
+        }
        if !manifest.activation.is_empty() {
            let events: Vec<String> = manifest.activation.iter().map(ToString::to_string).collect();
            println!("  activation: {}", events.join(", "));
@@ -361,9 +407,7 @@ fn check(dir: &Path) -> Result<(), String> {
        }
        println!("ok");
        Ok(())
-    })();
-    let _ = std::fs::remove_dir_all(&scratch);
-    result
+    })()
 }

 fn human_size(bytes: u64) -> String {
@@ -479,14 +523,31 @@ fn cmd_keygen(args: &[String]) -> Result<(), String> {
    Ok(())
 }

+fn cmd_endorse(args: &[String]) -> Result<(), String> {
+    let a = Args::parse(args, &[], &["key", "publisher"])?;
+    let usage = "usage: openidea-plugin endorse <new-public-key> --key <earlier-key-file> --publisher ID";
+    let ([new], Some(key), Some(publisher)) = (a.positional.as_slice(), a.value("key"), a.value("publisher")) else {
+        return Err(usage.into());
+    };
+    if !package::publisher_id_ok(publisher) {
+        return Err(format!("invalid publisher id {publisher:?}"));
+    }
+    let endorsement = read_key(key)?.endorse(publisher, new.trim());
+    println!("{}", serde_json::to_string_pretty(&endorsement).map_err(|e| e.to_string())?);
+    Ok(())
+}
+
+/// A fresh scratch directory, removed when dropped.
+fn scratch_dir(what: &str) -> Result<tempfile::TempDir, String> {
+    tempfile::Builder::new().prefix(&format!("openidea-plugin-{what}-")).tempdir().map_err(|e| e.to_string())
+}
+
 /// A scratch host to list a package's files as the IDE would.
 fn with_scratch_host<T>(f: impl FnOnce(&PluginHost) -> Result<T, String>) -> Result<T, String> {
-    let scratch = std::env::temp_dir().join(format!("openidea-plugin-pack-{}", std::process::id()));
-    let result = PluginHost::new(scratch.clone(), Arc::new(|_: Option<&str>, _| {}), Limits::default())
+    let tmp = scratch_dir("host")?;
+    PluginHost::new(tmp.path().join("host"), Arc::new(|_: Option<&str>, _| {}), Limits::default())
        .map_err(|e| e.to_string())
-        .and_then(|h| f(&h));
-    let _ = std::fs::remove_dir_all(&scratch);
-    result
+        .and_then(|h| f(&h))
 }

 fn cmd_pack(args: &[String]) -> Result<(), String> {
@@ -522,29 +583,28 @@ fn cmd_pack(args: &[String]) -> Result<(), String> {
 }

 fn cmd_index(args: &[String]) -> Result<(), String> {
-    let a = Args::parse(args, &[], &["publisher", "name", "key", "out"])?;
+    let a = Args::parse(args, &[], &["publisher", "name", "key", "previous-key", "out", "download-base"])?;
    let dir = canonical(&a.dir()?)?;
-    let publisher = a.value("publisher").ok_or("--publisher is required")?;
-    let name = a.value("name").unwrap_or(publisher);
-    let key = read_key(a.value("key").ok_or("--key is required")?)?;
    let out = a.value("out").map(PathBuf::from).unwrap_or_else(|| dir.join("index.json"));
+    let base = a.value("download-base").map(|b| b.trim_end_matches('/'));
    // Revocations and other publishers of an existing index are kept.
    let mut index = match std::fs::read_to_string(&out) {
-        Ok(text) => Index::parse(&text)?,
+        Ok(text) => current_format(Index::parse(&text)?, &out.to_string_lossy())?,
        Err(_) => Index { format: package::INDEX_FORMAT, ..Index::default() },
    };
-    // Earlier keys of the publisher stay listed (packages they signed remain valid until revoked).
-    let current = key.public_base64();
-    let earlier: Vec<KeyEntry> = index
-        .publishers
-        .iter()
-        .filter(|p| p.id == publisher)
-        .flat_map(|p| p.keys.iter().filter(|k| k.key != current).cloned())
-        .collect();
-    index.publishers.retain(|p| p.id != publisher);
-    let keys: Vec<KeyEntry> = std::iter::once(KeyEntry { key: current, revoked: false }).chain(earlier).collect();
-    index.publishers.push(package::Publisher { id: publisher.into(), name: name.into(), keys });
-    index.plugins.clear();
+    let publisher = match (a.value("publisher"), a.value("key")) {
+        (Some(publisher), Some(key)) => {
+            let key = read_key(key)?;
+            let name = a.value("name").unwrap_or(publisher);
+            let previous = a.value("previous-key").map(read_key).transpose()?;
+            index.publishers =
+                register_key(std::mem::take(&mut index.publishers), publisher, name, &key, previous.as_ref())?;
+            Some(publisher)
+        }
+        (None, None) if a.has("previous-key") => return Err("--previous-key goes with --publisher and --key".into()),
+        (None, None) => None,
+        _ => return Err("--publisher and --key go together".into()),
+    };
    let mut packages: Vec<PathBuf> = std::fs::read_dir(&dir)
        .map_err(|e| e.to_string())?
        .flatten()
@@ -552,35 +612,144 @@ fn cmd_index(args: &[String]) -> Result<(), String> {
        .filter(|p| p.extension().is_some_and(|e| e == package::PACKAGE_EXTENSION))
        .collect();
    packages.sort();
+    let engine = PluginEngine::new()?;
+    let mut added: Vec<IndexEntry> = Vec::new();
    for path in packages {
-        let scratch = std::env::temp_dir().join(format!("openidea-plugin-index-{}", std::process::id()));
-        let _ = std::fs::remove_dir_all(&scratch);
-        let unpacked = package::unpack(&path, &scratch)?;
+        let tmp = scratch_dir("index")?;
+        let scratch = tmp.path().join("package");
        let entry = (|| {
+            let unpacked = package::unpack(&path, &scratch)?;
            let m = Manifest::load(&scratch)?;
            let files = with_scratch_host(|h| h.package_files_of(&scratch).map_err(|e| e.to_string()))?;
            let digest = package::package_digest(&scratch, &files).map_err(|e| e.to_string())?;
-            let sig = unpacked.signature.as_ref().ok_or_else(|| format!("{}: not signed", path.display()))?;
-            sig.check(&m.id, &m.version, &digest).map_err(|e| format!("{}: {e}", path.display()))?;
+            let sig = unpacked.signature.as_ref().ok_or("not signed")?;
+            let signer = index.verify(sig, &m.id, &m.version, &digest)?;
+            if publisher.is_some_and(|p| p != signer) {
+                return Err(format!("signed by {signer}, not {}", publisher.unwrap_or_default()));
+            }
+            if added.iter().any(|e| (&e.id, &e.version) == (&m.id, &m.version)) {
+                return Err(format!("another package of {} {} is in the folder", m.id, m.version));
+            }
+            if m.legacy {
+                return Err("plugin.toml uses the 0.1 format; see plugins/README.md".into());
+            }
+            let built_for = match &m.wasm {
+                Some(wasm) => engine.check_component(&engine.compile(&scratch.join(wasm))?)?,
+                None => None,
+            };
+            let file = path.file_name().map(|n| n.to_string_lossy().into_owned()).unwrap_or_default();
            Ok::<_, String>(IndexEntry {
                id: m.id.clone(),
                name: m.name.clone(),
                version: m.version.clone(),
                description: m.description.clone(),
                authors: m.authors.clone(),
-                publisher: sig.publisher.clone(),
-                download: path.file_name().map(|n| n.to_string_lossy().into_owned()).unwrap_or_default(),
+                publisher: signer,
+                download: base.map_or_else(|| file.clone(), |b| format!("{b}/{file}")),
                digest,
                capabilities: m.capabilities.all().map(|c| c.to_string()).collect(),
+                engine: package::engine_requirement(&m.engine, built_for.as_ref()),
+                categories: m.categories(),
            })
        })();
-        let _ = std::fs::remove_dir_all(&scratch);
-        let entry = entry?;
-        println!("  {} {}", entry.id, entry.version);
-        index.plugins.push(entry);
+        let entry = entry.map_err(|e| format!("{}: {e}", path.display()))?;
+        println!("  {} {} (plugin API {})", entry.id, entry.version, entry.engine);
+        added.push(entry);
    }
-    let json = serde_json::to_string_pretty(&index).map_err(|e| e.to_string())?;
-    std::fs::write(&out, json).map_err(|e| format!("{}: {e}", out.display()))?;
+    // A publisher's earlier versions of these plugins stay for IDEs that can't load the new
+    // ones (pruned below); plugins no longer in the folder go.
+    index.plugins.retain(|e| match publisher {
+        Some(p) => {
+            e.publisher != p
+                || (added.iter().any(|n| n.id == e.id)
+                    && !added.iter().any(|n| (&n.id, &n.version) == (&e.id, &e.version)))
+        }
+        None => false,
+    });
+    index.plugins.extend(added);
+    index.prune_versions();
+    write_index(&index, &out)
+}
+
+/// `publishers` with `key` as `publisher`'s current key. Earlier keys stay listed
+/// (packages they signed remain valid until revoked); a key new to the
+/// publisher is endorsed by `previous`, one of them, so installed plugins
+/// signed with it update without asking.
+fn register_key(
+    mut publishers: Vec<package::Publisher>,
+    publisher: &str,
+    name: &str,
+    key: &PublisherKey,
+    previous: Option<&PublisherKey>,
+) -> Result<Vec<package::Publisher>, String> {
+    let current = key.public_base64();
+    let earlier: Vec<KeyEntry> = publishers.iter().filter(|p| p.id == publisher).flat_map(|p| p.keys.clone()).collect();
+    let entry = match earlier.iter().find(|k| k.key == current) {
+        Some(listed) => listed.clone(),
+        None => {
+            let endorsement = match previous {
+                Some(prev) => {
+                    let prev_key = prev.public_base64();
+                    if !earlier.iter().any(|k| k.key == prev_key && !k.revoked) {
+                        return Err(format!("--previous-key is not one of {publisher}'s valid keys in the index"));
+                    }
+                    Some(prev.endorse(publisher, &current))
+                }
+                None => {
+                    if earlier.iter().any(|k| !k.revoked) {
+                        println!(
+                            "  warning: {publisher}'s new key is not endorsed (--previous-key): users who installed \
+                             its plugins will be asked to confirm the change when they update"
+                        );
+                    }
+                    None
+                }
+            };
+            KeyEntry { endorsement, ..KeyEntry::new(current.clone()) }
+        }
+    };
+    let keys = std::iter::once(entry).chain(earlier.into_iter().filter(|k| k.key != current)).collect();
+    publishers.retain(|p| p.id != publisher);
+    publishers.push(package::Publisher { id: publisher.into(), name: name.into(), keys });
+    Ok(publishers)
+}
+
+/// `index`, unless a newer `openidea-plugin` wrote it (rewriting it would drop what this one can't read).
+fn current_format(index: Index, file: &str) -> Result<Index, String> {
+    if index.is_newer() {
+        return Err(format!(
+            "{file}: index format {} is newer than this tool writes; update openidea-plugin",
+            index.format
+        ));
+    }
+    Ok(index)
+}
+
+fn cmd_merge(args: &[String]) -> Result<(), String> {
+    let a = Args::parse(args, &[], &["keep", "out"])?;
+    let [base, other] = a.positional.as_slice() else {
+        return Err("usage: openidea-plugin merge <index> <other-index> --keep ID [--out FILE]".into());
+    };
+    let keep = a.value("keep").ok_or("--keep is required")?;
+    let out = a.value("out").unwrap_or(base);
+    let mut index =
+        current_format(Index::parse(&std::fs::read_to_string(base).map_err(|e| format!("{base}: {e}"))?)?, base)?;
+    let bytes = read_market_url(other, 16 << 20)?;
+    let theirs = Index::parse(&String::from_utf8(bytes).map_err(|_| format!("{other}: not UTF-8"))?)?;
+    let mut theirs = current_format(theirs, other)?;
+    // Their downloads are relative to their index, not to ours.
+    for e in &mut theirs.plugins {
+        e.download = resolve_market_href(other, &e.download);
+    }
+    let count = theirs.plugins.len();
+    index.include(theirs, &[keep]).map_err(|e| format!("{other}: {e}"))?;
+    println!("  {count} plugins from {other}");
+    write_index(&index, Path::new(out))
+}
+
+fn write_index(index: &Index, out: &Path) -> Result<(), String> {
+    let json = serde_json::to_string_pretty(index).map_err(|e| e.to_string())?;
+    std::fs::write(out, json).map_err(|e| format!("{}: {e}", out.display()))?;
    println!("-> {} ({} plugins)", out.display(), index.plugins.len());
    Ok(())
 }
@@ -589,6 +758,25 @@ fn cmd_index(args: &[String]) -> Result<(), String> {
 mod tests {
    use super::*;

+    #[test]
+    fn a_new_key_is_endorsed_by_the_previous_one() {
+        let (k1, k2, k3) =
+            (PublisherKey::from_seed([1; 32]), PublisherKey::from_seed([2; 32]), PublisherKey::from_seed([3; 32]));
+        let first = register_key(Vec::new(), "acme", "ACME", &k1, None).unwrap();
+        let rotated = register_key(first.clone(), "acme", "ACME", &k2, Some(&k1)).unwrap();
+        let index = Index { format: package::INDEX_FORMAT, publishers: rotated.clone(), ..Index::default() };
+        assert!(index.succeeds("acme", &k1.public_base64(), &k2.public_base64()));
+        assert_eq!(rotated[0].keys.len(), 2, "the earlier key stays listed");
+        // Registering the current key again keeps its endorsement.
+        let again = register_key(rotated.clone(), "acme", "ACME", &k2, None).unwrap();
+        assert_eq!(again, rotated);
+        // Only a key the publisher has can endorse.
+        assert!(register_key(first.clone(), "acme", "ACME", &k2, Some(&k3)).unwrap_err().contains("--previous-key"));
+        // Without one the new key is listed unendorsed.
+        let unendorsed = register_key(first, "acme", "ACME", &k3, None).unwrap();
+        assert!(unendorsed[0].keys[0].endorsement.is_none());
+    }
+
    #[test]
    fn names() {
        assert_eq!(slugify("My Cool_Plugin"), "my-cool-plugin");
@@ -601,13 +789,189 @@ mod tests {
        assert_eq!(relative(Path::new("/x/y"), Path::new("/z")), None);
    }

+    #[test]
+    fn new_plugins_depend_on_the_sdk_by_path_only_in_its_source_tree() {
+        let tree = dunce::canonicalize(concat!(env!("CARGO_MANIFEST_DIR"), "/../..")).unwrap();
+        assert_eq!(
+            sdk_dependency(None, &tree.join("plugins/official/new")).unwrap(),
+            "{ path = \"../../../sdk/rust/openidea-plugin\" }"
+        );
+        let outside = dunce::canonicalize(std::env::temp_dir()).unwrap().join("my-plugin");
+        assert_eq!(
+            sdk_dependency(None, &outside).unwrap(),
+            format!("{{ git = \"https://github.com/l0ng-ai/openidea\", tag = \"v{}\" }}", env!("CARGO_PKG_VERSION"))
+        );
+        let sdk = tree.join("sdk/rust/openidea-plugin");
+        assert!(sdk_dependency(Some(sdk.to_str().unwrap()), &outside).unwrap().starts_with("{ path = "));
+        assert!(
+            sdk_dependency(Some(tree.join("wit").to_str().unwrap()), &outside)
+                .unwrap_err()
+                .contains("not the openidea-plugin SDK")
+        );
+    }
+
+    /// A theme package `id` signed by `publisher` with `key`, packed into `out`.
+    fn signed_theme(tmp: &Path, id: &str, publisher: &str, key: &str, out: &Path) {
+        signed_theme_version(tmp, id, "0.1.0", "^1.0", publisher, key, out);
+    }
+
+    fn signed_theme_version(tmp: &Path, id: &str, version: &str, engine: &str, publisher: &str, key: &str, out: &Path) {
+        let src = tmp.join("src").join(format!("{id}-{version}"));
+        let vars = templates::Vars { id, name: id, sdk: None };
+        for (rel, content) in templates::render(templates::Template::Theme, &vars) {
+            let path = src.join(rel);
+            std::fs::create_dir_all(path.parent().unwrap()).unwrap();
+            let content = content
+                .replace("version = \"0.1.0\"", &format!("version = \"{version}\""))
+                .replace("engines.openidea = \"^1.0\"", &format!("engines.openidea = \"{engine}\""));
+            std::fs::write(path, content).unwrap();
+        }
+        std::fs::create_dir_all(out).unwrap();
+        let args = [src.to_str().unwrap(), "--key", key, "--publisher", publisher, "--out"]
+            .into_iter()
+            .map(String::from)
+            .chain([out.join(format!("{id}-{version}.oiplugin")).to_string_lossy().into_owned()])
+            .collect::<Vec<_>>();
+        cmd_pack(&args).unwrap();
+    }
+
+    #[test]
+    fn a_release_keeps_the_versions_older_ides_need() {
+        let tmp = tempfile::tempdir().unwrap();
+        let t = tmp.path();
+        let key = t.join("acme.key");
+        std::fs::write(&key, PublisherKey::from_seed([5; 32]).seed_base64()).unwrap();
+        let key = key.to_string_lossy().into_owned();
+        let index_file = t.join("index.json");
+        let release = |n: usize, packages: &[(&str, &str, &str)]| {
+            let dir = t.join(format!("release-{n}"));
+            for (id, version, engine) in packages {
+                signed_theme_version(t, id, version, engine, "acme", &key, &dir);
+            }
+            let base = format!("https://example.com/download/v{n}");
+            let args = [dir.to_str().unwrap(), "--publisher", "acme", "--key", &key, "--download-base", &base];
+            cmd_index(&strings(&[&args[..], &["--out", index_file.to_str().unwrap()]].concat())).unwrap();
+            let index = Index::parse(&std::fs::read_to_string(&index_file).unwrap()).unwrap();
+            index.plugins.iter().map(|e| format!("{} {} {}", e.id, e.version, e.download)).collect::<Vec<_>>()
+        };
+        release(1, &[("acme.a", "1.0.0", "^1.0"), ("acme.b", "1.0.0", "^1.0")]);
+        // Same requirement: the newer version replaces it; acme.b is gone from the release.
+        assert_eq!(
+            release(2, &[("acme.a", "1.1.0", "^1.0")]),
+            ["acme.a 1.1.0 https://example.com/download/v2/acme.a-1.1.0.oiplugin"]
+        );
+        // Another API requirement: the last version for the earlier one stays, where it was published.
+        assert_eq!(
+            release(3, &[("acme.a", "2.0.0", ">=1.0, <2")]),
+            [
+                "acme.a 1.1.0 https://example.com/download/v2/acme.a-1.1.0.oiplugin",
+                "acme.a 2.0.0 https://example.com/download/v3/acme.a-2.0.0.oiplugin",
+            ]
+        );
+        let index = Index::parse(&std::fs::read_to_string(&index_file).unwrap()).unwrap();
+        assert_eq!(index.offered()[0].0.version, "2.0.0", "the newest this IDE can load");
+    }
+
+    fn strings(args: &[&str]) -> Vec<String> {
+        args.iter().map(|a| a.to_string()).collect()
+    }
+
+    #[test]
+    fn official_and_community_indexes_merge() {
+        let tmp = tempfile::tempdir().unwrap();
+        let t = tmp.path();
+        let mut keys = Vec::new();
+        for (name, seed) in [("openidea", 1), ("alice", 2), ("carol", 3)] {
+            let file = t.join(format!("{name}.key"));
+            let key = PublisherKey::from_seed([seed; 32]);
+            std::fs::write(&file, key.seed_base64()).unwrap();
+            keys.push((file.to_string_lossy().into_owned(), key.public_base64()));
+        }
+        let (official, community) = (t.join("official"), t.join("community"));
+        signed_theme(t, "openidea.night", "openidea", &keys[0].0, &official);
+        signed_theme(t, "alice.dawn", "alice", &keys[1].0, &community);
+        let official_index = official.join("index.json");
+        let community_index = community.join("index.json");
+        let release = strings(&[official.to_str().unwrap(), "--publisher", "openidea", "--key", &keys[0].0]);
+        cmd_index(&release).unwrap();
+
+        // The community index lists its publishers; `index` without a key checks packages against them.
+        let skeleton = Index {
+            format: package::INDEX_FORMAT,
+            publishers: vec![package::Publisher {
+                id: "alice".into(),
+                name: "Alice".into(),
+                keys: vec![KeyEntry::new(keys[1].1.clone())],
+            }],
+            ..Index::default()
+        };
+        write_index(&skeleton, &community_index).unwrap();
+        cmd_index(&strings(&[community.to_str().unwrap()])).unwrap();
+
+        cmd_merge(&strings(&[
+            official_index.to_str().unwrap(),
+            community_index.to_str().unwrap(),
+            "--keep",
+            "openidea",
+        ]))
+        .unwrap();
+        // A release rebuilds the official plugins and keeps the community's.
+        cmd_index(&release).unwrap();
+        let index = Index::parse(&std::fs::read_to_string(&official_index).unwrap()).unwrap();
+        let listed: Vec<_> = index.plugins.iter().map(|e| (e.id.as_str(), e.publisher.as_str())).collect();
+        assert_eq!(listed, [("alice.dawn", "alice"), ("openidea.night", "openidea")]);
+        assert_eq!(index.plugins[1].categories, ["themes"], "implied by the theme");
+        assert_eq!(index.plugins[1].download, "openidea.night-0.1.0.oiplugin");
+        assert!(Path::new(&index.plugins[0].download).is_absolute(), "{}", index.plugins[0].download);
+
+        // A package by a publisher the index doesn't know is refused.
+        signed_theme(t, "carol.noon", "carol", &keys[2].0, &community);
+        let err = cmd_index(&strings(&[community.to_str().unwrap()])).unwrap_err();
+        assert!(err.contains("unknown publisher"), "{err}");
+    }
+
+    /// `cargo test` of a new Rust plugin (its own tests against the mock host) with this SDK.
+    #[test]
+    fn the_command_template_builds_against_the_sdk() {
+        let dir = std::env::temp_dir().join(format!("openidea-plugin-template-build-{}", std::process::id()));
+        let _ = std::fs::remove_dir_all(&dir);
+        std::fs::create_dir_all(&dir).unwrap();
+        let dir = dunce::canonicalize(&dir).unwrap();
+        let plugin = dir.join("plugin");
+        let sdk = concat!(env!("CARGO_MANIFEST_DIR"), "/../../sdk/rust/openidea-plugin");
+        let sdk = sdk_dependency(Some(sdk), &plugin).unwrap();
+        let vars = templates::Vars { id: "acme.sample", name: "Sample", sdk: Some(&sdk) };
+        for (rel, content) in templates::render(templates::Template::Command, &vars) {
+            let path = plugin.join(rel);
+            std::fs::create_dir_all(path.parent().unwrap()).unwrap();
+            std::fs::write(path, content).unwrap();
+        }
+        // The SDK's lockfile keeps the versions its own CI builds with (the resolver also
+        // looks up the wasm-only dependencies, which may not be downloaded yet).
+        let sdk_lock = concat!(env!("CARGO_MANIFEST_DIR"), "/../../sdk/rust/openidea-plugin/Cargo.lock");
+        std::fs::copy(sdk_lock, plugin.join("Cargo.lock")).unwrap();
+        let out = Command::new(std::env::var("CARGO").unwrap_or_else(|_| "cargo".into()))
+            .args(["test", "--manifest-path"])
+            .arg(plugin.join("Cargo.toml"))
+            .env("CARGO_TARGET_DIR", dir.join("target"))
+            .output()
+            .unwrap();
+        assert!(
+            out.status.success(),
+            "{}{}",
+            String::from_utf8_lossy(&out.stdout),
+            String::from_utf8_lossy(&out.stderr)
+        );
+        std::fs::remove_dir_all(&dir).unwrap();
+    }
+
    #[test]
    fn every_template_is_a_valid_package() {
        for t in templates::Template::ALL {
            let dir =
                std::env::temp_dir().join(format!("openidea-plugin-template-{}-{}", t.label(), std::process::id()));
            let _ = std::fs::remove_dir_all(&dir);
-            let vars = templates::Vars { id: "acme.sample", name: "Sample", sdk: Some("../sdk") };
+            let vars = templates::Vars { id: "acme.sample", name: "Sample", sdk: Some("{ path = \"../sdk\" }") };
            for (rel, content) in templates::render(t, &vars) {
                let path = dir.join(rel);
                std::fs::create_dir_all(path.parent().unwrap()).unwrap();
@@ -32,6 +32,7 @@ impl Template {
 pub struct Vars<'a> {
    pub id: &'a str,
    pub name: &'a str,
+    /// The SDK dependency, as a TOML value (`{ path = "…" }`).
    pub sdk: Option<&'a str>,
 }

@@ -82,6 +83,9 @@ name = "__NAME__"
 version = "0.1.0"
 description = "Adds two sample commands."
 authors = []
+# Marketplace categories (up to 3): languages, themes, icon-themes, linters,
+# vcs, ai, frameworks, tools, other.
+categories = ["tools"]
 engines.openidea = "^1.0"
 # Built by `openidea-plugin build`. The code is loaded the first time one of
 # its commands runs; the commands below show in Find Action before that.
@@ -115,7 +119,7 @@ publish = false
 crate-type = ["cdylib", "rlib"]

 [dependencies]
-openidea-plugin = { path = "__SDK__" }
+openidea-plugin = __SDK__

 [profile.release]
 opt-level = "s"
@@ -127,7 +131,7 @@ panic = "abort"

 const COMMAND_LIB: &str = r#"//! __NAME__: an OpenIDEA plugin.

-use openidea_plugin::{Invocation, NotificationLevel, Plugin, host, register_plugin};
+use openidea_plugin::{Error, Invocation, NotificationLevel, Plugin, host, register_plugin};

 #[derive(Default)]
 pub struct Main {
@@ -135,7 +139,7 @@ pub struct Main {
 }

 impl Plugin for Main {
-    fn run_command(&mut self, id: &str, ctx: &Invocation, _arg: Option<&str>) -> Result<Option<String>, String> {
+    fn run_command(&mut self, id: &str, ctx: &Invocation, _arg: Option<&str>) -> Result<Option<String>, Error> {
        match id {
            "say-hello" => {
                // Instance state lasts until the plugin is idle for a while;
@@ -150,7 +154,7 @@ impl Plugin for Main {
                let text = editor.document()?.text;
                Ok(Some(format!("{} lines in {}", text.lines().count(), editor.path())))
            }
-            _ => Err(format!("unknown command {id}")),
+            _ => Err(format!("unknown command {id}").into()),
        }
    }
 }
@@ -25,7 +25,7 @@ use ide_language::{LanguageRegistry, Syntax};
 use ide_run::ProcessManager;
 use ide_terminal::TerminalManager;
 use ide_workspace::SettingsStore;
-use parking_lot::RwLock;
+use parking_lot::{Mutex, RwLock};
 use std::collections::HashMap;
 use std::path::PathBuf;
 use std::sync::{Arc, OnceLock};
@@ -74,15 +74,23 @@ pub struct Host {
    pub environment: environment::Environment,
    /// The HTTP proxy's saved password (see `proxy.rs`).
    proxy_password: ide_ssh::secrets::SecretFile,
+    /// The proxy password when it could not be saved (no credential store).
+    proxy_session_password: Mutex<Option<String>>,
    pub(crate) sink_for: SinkFactory,
    owner: fn(&str) -> &str,
    pub runtime: tokio::runtime::Handle,
    /// One project per window, keyed by window label.
    projects: RwLock<HashMap<String, Arc<Project>>>,
+    pub(crate) external_logs: RwLock<HashMap<String, Vec<Arc<ide_vcs::Repo>>>>,
    requests: requests::Requests,
    project_requests: RwLock<HashMap<String, Vec<RequestId>>>,
+    /// Shutdowns of projects closed with [`Host::close_project_detached`].
+    closing: parking_lot::Mutex<Vec<std::thread::JoinHandle<()>>>,
 }

+/// How long exit waits for project shutdown before giving up.
+const EXIT_SHUTDOWN_WAIT: std::time::Duration = std::time::Duration::from_secs(10);
+
 impl Host {
    pub fn new(config: HostConfig) -> Self {
        let HostConfig {
@@ -102,6 +110,7 @@ impl Host {
        let host = Self {
            trust: trust::TrustStore::load(&config_dir, &data_dir),
            proxy_password: ide_ssh::secrets::SecretFile::new(data_dir.join("proxy-password.json")),
+            proxy_session_password: Mutex::default(),
            remote: Arc::new(ide_remote::RemoteService::new(ssh.clone(), data_dir.join("remote"))),
            ssh,
            environment: environment::Environment::new(project_environment, local_data_dir.clone()),
@@ -122,8 +131,10 @@ impl Host {
            owner,
            runtime,
            projects: RwLock::default(),
+            external_logs: RwLock::default(),
            requests: Default::default(),
            project_requests: RwLock::default(),
+            closing: Default::default(),
        };
        host.apply_proxy();
        host
@@ -177,45 +188,69 @@ impl Host {
        }
    }

+    /// Closes `window`'s project and waits until its language servers, kernels and
+    /// debug sessions have shut down. Never call this on the UI event-loop thread:
+    /// the shutdown runs on the async runtime, whose workers may themselves be
+    /// waiting for the event loop (IPC responses, window queries). Use
+    /// [`Self::close_project_detached`] there.
    pub fn close_project(&self, window: &str) {
-        let project = self.projects.write().remove(window);
-        if let Some(project) = project {
-            if !project.light {
-                self.environment.project_closed();
-            }
-            if let Some(bridge) = &project.kotlin_bridge {
-                bridge.stop();
-            }
-            project.documents.clear_workspace_edit_history();
-            project.agents.shutdown();
-            project.notebooks.stop_admission();
-            // What the closing window started goes with it — the builds and searches it
-            // asked for, its runs, its shells and its debug sessions — and the language
-            // servers finish shutting down before the window is gone, as IDEA closes a
-            // project's processes.
-            for request in self.project_requests.write().remove(self.owner_window(window)).unwrap_or_default() {
-                self.cancel_request(request);
-            }
-            self.processes.kill_project(&project.root);
-            self.terminals.kill_key(self.owner_window(window));
-            self.shutdown_project_workers_blocking(
-                vec![project.notebooks.clone()],
-                project.kotlin_bridge.iter().cloned().collect(),
-                Some(project.lsp.clone()),
-                Some((self.debugger.clone(), window.to_owned())),
-            );
+        if let Some(shutdown) = self.begin_close(window) {
+            self.wait_blocking(shutdown);
        }
    }

-    /// Synchronous project/window destruction must finish owned kernel cleanup,
-    /// not enqueue work which can be lost as the desktop runtime exits.
-    fn shutdown_project_workers_blocking(
+    /// Like [`Self::close_project`], but returns once the project is detached from
+    /// the window; its workers finish shutting down in the background, and
+    /// [`Self::shutdown_notebooks_on_exit`] waits for them before the process exits.
+    pub fn close_project_detached(&self, window: &str) {
+        if let Some(shutdown) = self.begin_close(window) {
+            let mut closing = self.closing.lock();
+            closing.retain(|handle| !handle.is_finished());
+            closing.push(shutdown);
+        }
+    }
+
+    /// Detaches the project from `window` and stops what it started, synchronously,
+    /// so the window can open another project at once. Returns the thread that
+    /// finishes shutting down its workers.
+    fn begin_close(&self, window: &str) -> Option<std::thread::JoinHandle<()>> {
+        self.external_logs.write().remove(self.owner_window(window));
+        for request in self.project_requests.write().remove(self.owner_window(window)).unwrap_or_default() {
+            self.cancel_request(request);
+        }
+        let project = self.projects.write().remove(window)?;
+        if !project.light {
+            self.environment.project_closed();
+        }
+        if let Some(bridge) = &project.kotlin_bridge {
+            bridge.stop();
+        }
+        project.documents.clear_workspace_edit_history();
+        project.agents.shutdown();
+        project.notebooks.stop_admission();
+        // What the closing window started goes with it — the builds and searches it
+        // asked for, its runs, its shells and its debug sessions — and its language
+        // servers shut down.
+        self.processes.kill_project(&project.root);
+        self.terminals.kill_key(self.owner_window(window));
+        Some(self.spawn_project_shutdown(
+            vec![project.notebooks.clone()],
+            project.kotlin_bridge.iter().cloned().collect(),
+            Some(project.lsp.clone()),
+            Some((self.debugger.clone(), window.to_owned())),
+        ))
+    }
+
+    /// Project/window destruction must finish owned kernel cleanup, not enqueue
+    /// work which can be lost as the desktop runtime exits: the returned thread is
+    /// joined by the closer or, for a detached close, before exit.
+    fn spawn_project_shutdown(
        &self,
        notebooks: Vec<Arc<notebook::NotebookService>>,
        bridges: Vec<Arc<kotlin_bridge::KotlinBridge>>,
        lsp: Option<Arc<ide_lsp::LspManager>>,
        debug: Option<(Arc<ide_dap::DebugManager>, String)>,
-    ) {
+    ) -> std::thread::JoinHandle<()> {
        for bridge in &bridges {
            bridge.stop();
        }
@@ -223,25 +258,37 @@ impl Host {
            service.stop_admission();
        }
        let runtime = self.runtime.clone();
-        let wait = move || {
-            let worker = std::thread::spawn(move || {
-                runtime.block_on(async move {
-                    for bridge in bridges {
-                        bridge.shutdown().await;
-                    }
-                    for service in notebooks {
-                        service.shutdown().await;
-                    }
-                    if let Some(lsp) = lsp {
-                        lsp.shutdown_all().await;
-                    }
-                    if let Some((debug, key)) = debug {
-                        debug.stop_key(&key).await;
-                    }
-                });
+        std::thread::spawn(move || {
+            runtime.block_on(async move {
+                for bridge in bridges {
+                    bridge.shutdown().await;
+                }
+                for service in notebooks {
+                    service.shutdown().await;
+                }
+                if let Some(lsp) = lsp {
+                    lsp.shutdown_all().await;
+                }
+                if let Some((debug, key)) = debug {
+                    debug.stop_key(&key).await;
+                }
            });
-            if let Err(error) = worker.join() {
-                tracing::error!("notebook shutdown thread failed: {error:?}");
+        })
+    }
+
+    /// Waits for detached closes, so a project opened next never races the
+    /// language servers of one still shutting down (e.g. over a shared workspace).
+    pub(crate) fn wait_detached_closes(&self) {
+        let pending: Vec<_> = self.closing.lock().drain(..).collect();
+        for shutdown in pending {
+            self.wait_blocking(shutdown);
+        }
+    }
+
+    fn wait_blocking(&self, shutdown: std::thread::JoinHandle<()>) {
+        let wait = move || {
+            if let Err(error) = shutdown.join() {
+                tracing::error!("project shutdown thread failed: {error:?}");
            }
        };
        if tokio::runtime::Handle::try_current()
@@ -253,15 +300,32 @@ impl Host {
        }
    }

-    /// Called before the desktop runtime exits, including update/restart exits.
+    /// Called before the desktop runtime exits, including update/restart exits, on
+    /// the event-loop thread: waits for detached closes and the open projects'
+    /// kernels, but no longer than [`EXIT_SHUTDOWN_WAIT`], so a runtime worker
+    /// stuck on the event loop cannot keep the process from exiting.
    pub fn shutdown_notebooks_on_exit(&self) {
        let projects = self.projects();
-        self.shutdown_project_workers_blocking(
+        let mut pending: Vec<_> = self.closing.lock().drain(..).collect();
+        pending.push(self.spawn_project_shutdown(
            projects.iter().map(|project| project.notebooks.clone()).collect(),
            projects.iter().filter_map(|project| project.kotlin_bridge.clone()).collect(),
            None,
            None,
-        );
+        ));
+        let deadline = std::time::Instant::now() + EXIT_SHUTDOWN_WAIT;
+        while pending.iter().any(|handle| !handle.is_finished()) {
+            if std::time::Instant::now() >= deadline {
+                tracing::warn!("project shutdown did not finish within {EXIT_SHUTDOWN_WAIT:?}; exiting anyway");
+                return;
+            }
+            std::thread::sleep(std::time::Duration::from_millis(20));
+        }
+        for handle in pending {
+            if let Err(error) = handle.join() {
+                tracing::error!("project shutdown thread failed: {error:?}");
+            }
+        }
    }

    /// Called before desktop exit, which may bypass document destructors.
@@ -311,14 +375,20 @@ impl Host {
    }

    pub fn begin_project_request(&self, window: &str, id: RequestId) -> CancellationToken {
-        let token = self.begin_request(id);
-        self.project_requests.write().entry(self.owner_window(window).to_owned()).or_default().push(id);
+        let token = self.begin_project_read_request(window, id);
        if self.project(window).is_ok_and(|p| !p.is_trusted()) {
            token.cancel();
        }
        token
    }

+    /// Read-only work remains cancellable/disposed with its window in restricted projects.
+    pub fn begin_project_read_request(&self, window: &str, id: RequestId) -> CancellationToken {
+        let token = self.begin_request(id);
+        self.project_requests.write().entry(self.owner_window(window).to_owned()).or_default().push(id);
+        token
+    }
+
    pub fn end_request(&self, id: RequestId) {
        for ids in self.project_requests.write().values_mut() {
            ids.retain(|entry| *entry != id);
@@ -18,7 +18,7 @@ pub async fn blocking<T: Send + 'static>(f: impl FnOnce() -> IdeResult<T> + Send
 /// editor buffer, so syntax features and language-server requests work in it.
 pub async fn doc_open_virtual(host: &Host, window: &str, uri: String) -> IdeResult<DocumentInfo> {
    let project = host.project(window)?;
-    let vd = project.lsp.virtual_document(&uri).await?;
+    let vd = crate::ops::lsp::lsp_virtual_document(host, window, uri).await?;
    blocking(move || project.documents.open_virtual(&vd.uri, vd.language_id, &vd.text)).await
 }

@@ -137,16 +137,23 @@ pub fn set_writable(host: &Host, window: &str, path: PathBuf, writable: bool) ->
 pub async fn delete(host: &Host, window: &str, path: PathBuf) -> IdeResult<()> {
    let history = host.project(window).ok().map(|p| p.history.clone());
    host.blocking(move || {
+        let paths = ide_workspace::file_ops::deletion_paths(&path)?;
        if let Some(h) = history {
-            h.record_deletion(&path, DELETE_SNAPSHOT_LIMIT);
+            for p in paths {
+                h.record_deletion(&p, DELETE_SNAPSHOT_LIMIT);
+            }
        }
-        ide_vfs::delete(&path)
+        ide_workspace::file_ops::delete(&path)
    })
    .await
 }

 pub async fn copy(host: &Host, from: PathBuf, to: PathBuf) -> IdeResult<()> {
-    host.blocking(move || ide_vfs::copy(&from, &to)).await
+    host.blocking(move || ide_workspace::file_ops::copy(&from, &to)).await
+}
+
+pub async fn rename(host: &Host, from: PathBuf, to: PathBuf) -> IdeResult<()> {
+    host.blocking(move || ide_workspace::file_ops::rename(&from, &to)).await
 }

 /// Reads a text file without opening it as a document; prefers the unsaved buffer.
@@ -76,9 +76,17 @@ async fn plugin_call<T: Send + 'static>(f: impl FnOnce() -> T + Send + 'static)
    tokio::task::spawn_blocking(f).await.ok()
 }

-/// Items from plugins carry no server (resolve and commands don't apply).
+/// Items from plugins carry no server: commands don't apply, and a code
+/// action is resolved by the plugin named in its `data` ([`PluginActionRef`]).
 const PLUGIN_SERVER: ServerId = ServerId(0);

+/// `data` of a plugin's code action whose edits it computes when picked.
+#[derive(serde::Serialize, serde::Deserialize)]
+struct PluginActionRef {
+    plugin: String,
+    data: String,
+}
+
 /// A plugin's `completion-item.kind` (wit/providers.wit lists them).
 fn plugin_completion_kind(kind: &str) -> Option<CompletionKind> {
    Some(match kind {
@@ -120,14 +128,14 @@ fn plugin_completion(item: ide_plugin::CompletionItem) -> CompletionItem {
        kind,
        documentation: item.documentation.map(|value| Markup { kind: "markdown".into(), value }),
        sort_text: item.sort_text,
-        filter_text: None,
+        filter_text: item.filter_text,
        preselect: false,
        deprecated: false,
        insert_text: item.insert_text,
-        is_snippet: false,
+        is_snippet: item.snippet,
        replace_range: item.replace,
        replace_range_tab: None,
-        additional_edits: Vec::new(),
+        additional_edits: item.additional_edits,
        commit_characters: Vec::new(),
        command: None,
        data: None,
@@ -252,6 +260,9 @@ pub async fn lsp_implementations(
 /// Contents of a read-only language-server document, including JDT library
 /// classes and disk class files. Cached per project.
 pub async fn lsp_virtual_document(host: &Host, window: &str, uri: String) -> IdeResult<VirtualDocument> {
+    if uri.starts_with("git-revision:") {
+        return crate::ops::vcs::revision_virtual_document(host, window, &uri).await;
+    }
    host.project(window)?.lsp.virtual_document(&uri).await
 }

@@ -314,7 +325,7 @@ pub async fn lsp_code_actions(
    };
    let plugin_actions: Vec<CodeAction> = plugin_actions
        .into_iter()
-        .map(|(_, a)| plugin_code_action(a))
+        .map(|(plugin, a)| plugin_code_action(&plugin, a))
        .filter(|a| {
            only.is_empty()
                || a.kind.as_ref().is_some_and(|k| only.iter().any(|o| k == o || k.starts_with(&format!("{o}."))))
@@ -330,24 +341,53 @@ pub async fn lsp_code_actions(
    prepare_actions(project, doc, version, actions).await
 }

-fn plugin_code_action(a: ide_plugin::CodeAction) -> CodeAction {
-    let files = a
+fn plugin_code_action(plugin: &str, a: ide_plugin::CodeAction) -> CodeAction {
+    // With `data` and no edits, the plugin computes them when the action is picked.
+    let lazy = a.edits.is_empty() && a.data.is_some();
+    let files: Vec<_> = a
        .edits
        .into_iter()
        .map(|(path, edits)| ide_core::FileEdit::Edit { path: path.into(), edits, version: None })
        .collect();
+    let data = a
+        .data
+        .filter(|_| lazy)
+        .and_then(|data| serde_json::to_value(PluginActionRef { plugin: plugin.to_owned(), data }).ok());
    CodeAction {
        title: a.title,
        kind: a.kind,
        is_preferred: a.preferred,
        disabled_reason: None,
-        edit: Some(WorkspaceEdit { files, preconditions: Vec::new() }),
+        edit: (!lazy).then(|| WorkspaceEdit { files, preconditions: Vec::new() }),
        command: None,
-        data: None,
+        data,
        server: PLUGIN_SERVER,
    }
 }

+/// A code action resolved by whoever offered it: its language server, or
+/// the plugin its `data` names.
+async fn resolve_action(host: &Host, window: &str, doc: DocId, action: CodeAction) -> IdeResult<CodeAction> {
+    if action.server != PLUGIN_SERVER {
+        return host.project(window)?.lsp.resolve_code_action(doc, action).await;
+    }
+    let Some(r) = action.data.clone().and_then(|d| serde_json::from_value::<PluginActionRef>(d).ok()) else {
+        return Ok(action);
+    };
+    let (plugins, d) = plugin_providers(host, window, doc, ProviderKind::CodeActions)
+        .ok_or_else(|| ide_core::IdeError::unavailable("the plugin that offered this action is gone"))?;
+    let pending = ide_plugin::CodeAction {
+        title: action.title.clone(),
+        kind: action.kind.clone(),
+        preferred: action.is_preferred,
+        edits: Vec::new(),
+        data: Some(r.data),
+    };
+    let plugin = r.plugin.clone();
+    let resolved = blocking(move || plugins.resolve_code_action(&plugin, &d, pending)).await?;
+    Ok(plugin_code_action(&r.plugin, ide_plugin::CodeAction { data: None, ..resolved }))
+}
+
 /// Cancellable code actions with the kinds the servers advertise (Refactor This, refactoring availability).
 pub async fn lsp_code_action_query(
    host: &Host,
@@ -381,7 +421,7 @@ pub async fn lsp_resolve_code_action(
    let project = host.project(window)?;
    let documents = project.documents.clone();
    let version = blocking(move || documents.version(doc)).await?;
-    let action = project.lsp.resolve_code_action(doc, action).await?;
+    let action = resolve_action(host, window, doc, action).await?;
    Ok(prepare_actions(project, doc, version, vec![action]).await?.remove(0))
 }

@@ -391,7 +431,7 @@ pub async fn lsp_apply_code_action(host: &Host, window: &str, doc: DocId, action
    let action = if action.edit.is_none() && action.command.is_none() {
        let documents = project.documents.clone();
        let version = blocking(move || documents.version(doc)).await?;
-        let action = project.lsp.resolve_code_action(doc, action).await?;
+        let action = resolve_action(host, window, doc, action).await?;
        prepare_actions(project.clone(), doc, version, vec![action]).await?.remove(0)
    } else {
        action
@@ -401,12 +441,30 @@ pub async fn lsp_apply_code_action(host: &Host, window: &str, doc: DocId, action
        let edit = edit.clone();
        blocking(move || apply_edit(&documents, &edit)).await?;
    }
-    if let Some(command) = action.command {
+    if let Some(command) = action.command
+        && !(action.edit.is_some() && is_client_follow_up(&project, doc, None, &command).await)
+    {
        project.lsp.execute_command(doc, command).await?;
    }
    Ok(())
 }

+/// A command after a code action's edit that no server provides: what other editors'
+/// extensions do once the edit is applied (vtsls' `_typescript.didOrganizeImports`). The edit
+/// is the action; there is nothing to run.
+async fn is_client_follow_up(
+    project: &crate::project::Project,
+    doc: DocId,
+    server: Option<ide_core::ServerId>,
+    command: &Command,
+) -> bool {
+    let provided = project.lsp.provides_command(doc, server, &command.command).await;
+    if !provided {
+        tracing::debug!("skipping `{}` after the code action's edit: no server provides it", command.command);
+    }
+    !provided
+}
+
 pub async fn lsp_prepare_rename(host: &Host, window: &str, doc: DocId, pos: Pos) -> IdeResult<Option<Range>> {
    host.project(window)?.lsp.prepare_rename(doc, pos).await
 }
@@ -639,6 +697,7 @@ pub async fn lsp_execute_code_action(
        if cancel.is_cancelled() {
            return Err(ide_core::IdeError::cancelled());
        }
+        let edited = action.edit.is_some();
        if let Some(edit) = action.edit {
            let documents = project.documents.clone();
            tokio::task::spawn_blocking(move || apply_edit(&documents, &edit))
@@ -646,6 +705,9 @@ pub async fn lsp_execute_code_action(
                .map_err(|e| ide_core::IdeError::internal(e.to_string()))??;
        }
        match action.command {
+            Some(command) if edited && is_client_follow_up(&project, doc, Some(action.server), &command).await => {
+                Ok(Vec::new())
+            }
            Some(command) => project
                .lsp
                .execute_action_command(doc, action.server, command, answers, cancel)
@@ -801,6 +863,25 @@ pub(crate) fn register(d: &mut Dispatcher) {
 mod tests {
    use super::*;

+    #[test]
+    fn a_plugin_action_with_data_and_no_edits_is_resolved_by_its_plugin() {
+        let action = |edits: Vec<(std::path::PathBuf, Vec<TextEdit>)>, data: Option<&str>| ide_plugin::CodeAction {
+            title: "Fix".into(),
+            kind: None,
+            preferred: false,
+            edits,
+            data: data.map(str::to_owned),
+        };
+        let lazy = plugin_code_action("acme.x", action(Vec::new(), Some("ref")));
+        assert!(lazy.edit.is_none());
+        let r: PluginActionRef = serde_json::from_value(lazy.data.unwrap()).unwrap();
+        assert_eq!((r.plugin.as_str(), r.data.as_str()), ("acme.x", "ref"));
+        // With edits, `data` is the plugin's business: applied as is.
+        let edit = TextEdit { range: Range::default(), new_text: "x".into() };
+        let eager = plugin_code_action("acme.x", action(vec![("/a".into(), vec![edit])], Some("ref")));
+        assert!(eager.edit.is_some() && eager.data.is_none());
+    }
+
    #[test]
    fn every_completion_kind_the_plugin_api_documents_is_understood() {
        let wit = include_str!("../../../../wit/providers.wit");
@@ -3,7 +3,7 @@ use crate::Host;
 use crate::Project;
 use crate::rpc::Dispatcher;
 use ide_core::{DocId, IdeResult, IpcPath, Location, Pos};
-use ide_index::{FileMatch, IndexStatus, SymbolFilter, SymbolMatch};
+use ide_index::{ExtensionCount, FileMatch, IndexStatus, SymbolFilter, SymbolMatch};
 use ide_language::{FileReference, WebReference};
 use ide_workspace::file_refs::{self, PathCompletion};
 use serde::{Deserialize, Serialize};
@@ -32,10 +32,19 @@ pub fn index_status(host: &Host, window: &str) -> IdeResult<IndexStatus> {
    Ok(host.project(window)?.index.status())
 }

+/// The project's file extensions, most common first.
+pub fn index_file_extensions(host: &Host, window: &str) -> IdeResult<Vec<ExtensionCount>> {
+    Ok(host.project(window)?.index.file_extensions())
+}
+
 pub fn find_files(host: &Host, window: &str, query: String, limit: u32) -> IdeResult<Vec<FileMatch>> {
    Ok(host.project(window)?.index.find_files(&query, limit as usize))
 }

+pub fn find_dirs(host: &Host, window: &str, query: String, limit: u32) -> IdeResult<Vec<FileMatch>> {
+    Ok(host.project(window)?.index.find_dirs(&query, limit as usize))
+}
+
 pub fn find_symbols(
    host: &Host,
    window: &str,
@@ -156,7 +165,9 @@ pub async fn web_unresolved_references(host: &Host, window: &str, doc: DocId) ->
 /// Commands of this module the remote server answers.
 pub(crate) fn register(d: &mut Dispatcher) {
    d.add("index_status", |c| async move { index_status(&c.host, &c.window) });
+    d.add("index_file_extensions", |c| async move { index_file_extensions(&c.host, &c.window) });
    d.add("find_files", |c| async move { find_files(&c.host, &c.window, c.arg("query")?, c.arg("limit")?) });
+    d.add("find_dirs", |c| async move { find_dirs(&c.host, &c.window, c.arg("query")?, c.arg("limit")?) });
    d.add("find_symbols", |c| async move {
        find_symbols(&c.host, &c.window, c.arg("query")?, c.arg("filter")?, c.arg("limit")?)
    });
@@ -17,6 +17,8 @@ pub struct ProjectInfo {
    pub settings: Settings,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub workspace: Option<ide_workspace::workspace::Workspace>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub unity: Option<ide_workspace::unity::UnityProjectInfo>,
 }

 pub fn info(project: &Project) -> ProjectInfo {
@@ -33,6 +35,7 @@ pub fn info(project: &Project) -> ProjectInfo {
        settings,
        root: project.root.clone().into(),
        workspace: ide_workspace::workspace::Workspace::load(&project.root).ok().flatten(),
+        unity: ide_workspace::unity::detect(&project.root),
    }
 }

@@ -172,7 +175,12 @@ pub fn set_settings(
        host.apply_proxy();
    }
    // A new interpreter / toolchain / server executable restarts the language servers it affects.
-    let code_style = key == "editor" || key == "editor.codeStyle" || key.starts_with("editor.codeStyle.");
+    // So do inspections that are compiler options (`ide-sdk` `configure_java_compiler`).
+    let code_style = key == "editor"
+        || key == "editor.codeStyle"
+        || key.starts_with("editor.codeStyle.")
+        || key == "inspections"
+        || key.starts_with("inspections.");
    let toolchain = ["languages", "tools", "languageServers", "projectStructure"]
        .iter()
        .any(|k| key == *k || key.starts_with(&format!("{k}.")));
@@ -155,6 +155,9 @@ pub async fn start(host: &Host, window: &str, config: RunConfig, on_output: Emit
    let (root, settings) = settings_for(host, &project, &config)?;
    let root = &root;
    // Configurations made in the UI name bare tools (`godot`) that may live outside PATH.
+    // Maven re-applies too: a config listed before a settings change (daemon toggle,
+    // Maven home) keeps the launcher that was current then; re-resolving at launch is
+    // what makes the setting take effect without reopening the project.
    let mut config = config;
    if config.kind == "maven" {
        ide_sdk::apply::prepare_maven_run(&mut config, root, &settings);
@@ -142,6 +142,21 @@ pub async fn run_gradle_jvm_args_script(_host: &Host, _window: &str, jvm_args: V
    .map_err(|e| IdeError::internal(e.to_string()))?
 }

+/// Writes one of the IDE's Gradle init scripts (`text`; the file is named `<name>-<hash>`) on
+/// the machine that runs the build, for `--init-script`, and returns its path.
+pub async fn run_gradle_init_script(_host: &Host, _window: &str, name: String, text: String) -> IdeResult<String> {
+    if name.is_empty() || !name.bytes().all(|b| b.is_ascii_alphanumeric() || b == b'-') {
+        return Err(IdeError::invalid(format!("invalid init script name {name:?}")));
+    }
+    tokio::task::spawn_blocking(move || {
+        ide_run::gradle_jvm::write_script(&ide_run::gradle_jvm::default_dir(), &name, &text)
+            .map(|p| p.to_string_lossy().into_owned())
+            .map_err(|e| IdeError::internal(format!("cannot write the Gradle init script: {e}")))
+    })
+    .await
+    .map_err(|e| IdeError::internal(e.to_string()))?
+}
+
 /// Results from the JUnit XML reports (Surefire, Failsafe, Gradle) of the module at
 /// `module` (relative to the project root) written since `since_ms` (Unix epoch, ms).
 pub async fn run_test_reports(
@@ -308,6 +323,9 @@ pub(crate) fn register(d: &mut Dispatcher) {
    d.add("run_gradle_jvm_args_script", |c| async move {
        run_gradle_jvm_args_script(&c.host, &c.window, c.arg("jvmArgs")?).await
    });
+    d.add("run_gradle_init_script", |c| async move {
+        run_gradle_init_script(&c.host, &c.window, c.arg("name")?, c.arg("text")?).await
+    });
    d.add("run_test_reports", |c| async move {
        run_test_reports(&c.host, &c.window, c.arg("module")?, c.arg("sinceMs")?).await
    });
@@ -34,6 +34,42 @@ pub fn sdk_python_effective(host: &Host, window: &str) -> IdeResult<Option<ide_c
    Ok(ide_sdk::apply::python_interpreter(&project.root, &project.settings.effective()).map(Into::into))
 }

+/// The PHP language level of the project `path` belongs to (a workspace member, by path, as
+/// the language server configuration picks it).
+#[derive(Clone, Debug, serde::Serialize, specta::Type)]
+#[serde(rename_all = "camelCase")]
+pub struct PhpLanguageLevels {
+    /// The one Intelephense checks against; `None`: its default.
+    pub effective: Option<ide_sdk::php::PhpLanguageLevel>,
+    /// The one Auto picks, from `composer.json`.
+    pub auto: Option<ide_sdk::php::PhpLanguageLevel>,
+    /// The workspace member `path` belongs to: its own settings choose the level, not the
+    /// workspace's. `None`: the opened project.
+    pub member: Option<ide_core::IpcPath>,
+}
+
+pub async fn sdk_php_language_level(host: &Host, window: &str, path: PathBuf) -> IdeResult<PhpLanguageLevels> {
+    let project = host.project(window)?;
+    let (project_root, project_settings) = (project.root.clone(), project.settings.effective());
+    let config_dir = host.config_dir.clone();
+    tokio::task::spawn_blocking(move || {
+        let member = ide_workspace::workspace::Workspace::load(&project_root).ok().flatten().and_then(|w| {
+            w.projects.into_iter().filter(|p| path.starts_with(p)).max_by_key(|p| p.components().count())
+        });
+        let (root, settings) = match &member {
+            Some(member) => (member, ide_workspace::SettingsStore::load(&config_dir, Some(member)).effective()),
+            None => (&project_root, project_settings),
+        };
+        PhpLanguageLevels {
+            effective: ide_sdk::php::language_level(root, &settings),
+            auto: ide_sdk::php::composer_level(root),
+            member: member.map(ide_core::IpcPath),
+        }
+    })
+    .await
+    .map_err(join_err)
+}
+
 /// SDK / library source folders shown under "External Libraries" in the Project view,
 /// with the Maven / Gradle dependency jars of the build model.
 pub async fn sdk_project_libraries(host: &Host, window: &str) -> IdeResult<Vec<ide_sdk::libraries::LibraryGroup>> {
@@ -144,6 +180,10 @@ pub async fn sdk_python_pip(
 pub(crate) fn register(d: &mut Dispatcher) {
    d.add("sdk_detect", |c| async move { sdk_detect(&c.host, &c.window, c.arg("kind")?).await });
    d.add("sdk_python_effective", |c| async move { sdk_python_effective(&c.host, &c.window) });
+    d.add(
+        "sdk_php_language_level",
+        |c| async move { sdk_php_language_level(&c.host, &c.window, c.arg("path")?).await },
+    );
    d.add("sdk_project_libraries", |c| async move { sdk_project_libraries(&c.host, &c.window).await });
    d.add("sdk_locate_tools", |c| async move {
        sdk_locate_tools(&c.host, &c.window, c.arg("names")?, c.arg("near")?).await
@@ -12,6 +12,76 @@ use std::path::{Path, PathBuf};

 use crate::apply_git_executable;

+/// Read-only repository access also works in a standalone log window.
+struct LogAccess {
+    project: Option<std::sync::Arc<Project>>,
+    external: Option<std::sync::Arc<Repo>>,
+    cache: PathBuf,
+}
+
+/// Immutable Git objects exposed through the editor's ordinary read-only VFS.
+pub async fn revision_virtual_document(
+    host: &Host,
+    window: &str,
+    uri: &str,
+) -> IdeResult<ide_lsp::types::VirtualDocument> {
+    #[derive(Deserialize)]
+    struct Target {
+        repo: PathBuf,
+        revision: String,
+        path: PathBuf,
+    }
+    let encoded = uri
+        .strip_prefix("git-revision:")
+        .and_then(|s| s.split('/').next())
+        .ok_or_else(|| ide_core::IdeError::invalid("invalid Git revision URI"))?;
+    if encoded.len() > 32768 || encoded.len() % 2 != 0 || !encoded.bytes().all(|b| b.is_ascii_hexdigit()) {
+        return Err(ide_core::IdeError::invalid("invalid Git revision URI"));
+    }
+    let bytes = (0..encoded.len())
+        .step_by(2)
+        .map(|i| {
+            u8::from_str_radix(&encoded[i..i + 2], 16)
+                .map_err(|_| ide_core::IdeError::invalid("invalid Git revision URI"))
+        })
+        .collect::<IdeResult<Vec<_>>>()?;
+    let target: Target = serde_json::from_slice(&bytes).map_err(|e| ide_core::IdeError::invalid(e.to_string()))?;
+    let path = target.repo.join(&target.path);
+    let text = vcs_file_at(host, window, path, Some(target.revision.clone()))
+        .await?
+        .ok_or_else(|| ide_core::IdeError::not_found("file is absent at this revision"))?;
+    Ok(ide_lsp::types::VirtualDocument {
+        uri: uri.into(),
+        language_id: host.languages.detect(&target.path, text.lines().next()),
+        text,
+        title: target.path.file_name().unwrap_or_default().to_string_lossy().into_owned(),
+        description: Some(format!("{} · {}", target.repo.display(), target.revision)),
+        decompiled: false,
+    })
+}
+impl LogAccess {
+    fn new(host: &Host, window: &str, at: Option<&Path>) -> Self {
+        let project = host.project(window).ok();
+        let external = host
+            .external_logs
+            .read()
+            .get(host.owner_window(window))
+            .and_then(|rs| rs.iter().find(|r| Some(r.root()) == at).cloned())
+            .filter(|repo| project.as_ref().is_none_or(|p| p.repos().at_root(repo.root()).is_none()));
+        Self { project, external, cache: host.local_data_dir.join("cache/git-log") }
+    }
+    fn with_log_repo_at<T>(&self, at: Option<&Path>, f: impl FnOnce(&Repo) -> IdeResult<T>) -> IdeResult<T> {
+        if let Some(repo) = &self.external {
+            repo.enable_log_index(&self.cache);
+            return f(repo);
+        }
+        self.project
+            .as_ref()
+            .ok_or_else(|| ide_core::IdeError::unavailable("external Git log is not open"))?
+            .with_log_repo_at(at, f)
+    }
+}
+
 /// A repository of the project (IDEA's VCS root).
 #[derive(Serialize, Deserialize, Type)]
 #[serde(rename_all = "camelCase")]
@@ -182,8 +252,8 @@ pub fn vcs_roots(host: &Host, window: &str) -> IdeResult<Vec<VcsRoot>> {
 }

 pub async fn vcs_branch_info(host: &Host, window: &str, repo: Option<PathBuf>) -> IdeResult<BranchInfo> {
-    let project = host.project(window)?;
-    blocking(move || project.with_repo_at(repo.as_deref(), |r| r.branch_info())).await
+    let project = LogAccess::new(host, window, repo.as_deref());
+    blocking(move || project.with_log_repo_at(repo.as_deref(), |r| r.branch_info())).await
 }

 /// Gutter change markers for a file, computed against its current (unsaved) text.
@@ -197,9 +267,21 @@ pub async fn vcs_line_hunks(host: &Host, window: &str, path: PathBuf) -> IdeResu
 }

 pub async fn vcs_file_at(host: &Host, window: &str, path: PathBuf, rev: Option<String>) -> IdeResult<Option<String>> {
-    let project = host.project(window)?;
+    let project = host.project(window).ok();
+    let external = host.external_logs.read().get(host.owner_window(window)).and_then(|rs| {
+        rs.iter().filter(|r| path.starts_with(r.root())).max_by_key(|r| r.root().components().count()).cloned()
+    });
    blocking(move || {
-        project.with_repo_of(&path, |r| r.file_at(&path, rev.as_deref(), project.vcs_encoding(&path, rev.as_deref())?))
+        if let Some(project) = project {
+            return project.with_log_repo_of(&path, |r| {
+                r.file_at(&path, rev.as_deref(), project.vcs_encoding(&path, rev.as_deref())?)
+            });
+        }
+        external.ok_or_else(|| ide_core::IdeError::unavailable("external Git log is not open"))?.file_at(
+            &path,
+            rev.as_deref(),
+            encoding_rs::UTF_8,
+        )
    })
    .await
 }
@@ -222,9 +304,148 @@ pub async fn vcs_blame(
    .await
 }

-pub async fn vcs_log(host: &Host, window: &str, repo: Option<PathBuf>, query: LogQuery) -> IdeResult<Vec<Commit>> {
+/// History for Selection: the commits that changed `lines` (0-based, inclusive) of the
+/// editor's text of `path`. Cancellable.
+pub async fn vcs_block_history(
+    host: &Host,
+    window: &str,
+    request: RequestId,
+    path: PathBuf,
+    text: Option<String>,
+    lines: (u32, u32),
+) -> IdeResult<BlockHistory> {
    let project = host.project(window)?;
-    blocking(move || project.with_repo_at(repo.as_deref(), |r| r.log(&query))).await
+    let cancel = host.begin_request(request);
+    let result = blocking(move || {
+        let text = text.or_else(|| project.documents.text_of(&path));
+        project.with_repo_of(&path, |r| {
+            r.block_history(&path, text.as_deref(), lines, project.vcs_encoding(&path, None)?, &cancel)
+        })
+    })
+    .await;
+    host.end_request(request);
+    result
+}
+
+pub async fn vcs_log(host: &Host, window: &str, repo: Option<PathBuf>, query: LogQuery) -> IdeResult<Vec<Commit>> {
+    let project = LogAccess::new(host, window, repo.as_deref());
+    let request = query.request;
+    let cancel =
+        request.map_or_else(ide_core::CancellationToken::new, |id| host.begin_project_read_request(window, id));
+    let result = blocking(move || {
+        project.with_log_repo_at(repo.as_deref(), |r| {
+            r.enable_log_index(&project.cache);
+            r.log_cancellable(&query, &cancel)
+        })
+    })
+    .await;
+    if let Some(id) = request {
+        host.end_request(id);
+    }
+    result
+}
+
+pub async fn vcs_log_refs(
+    host: &Host,
+    window: &str,
+    repo: Option<PathBuf>,
+) -> IdeResult<std::collections::BTreeMap<String, String>> {
+    let project = LogAccess::new(host, window, repo.as_deref());
+    blocking(move || project.with_log_repo_at(repo.as_deref(), |r| r.log_refs())).await
+}
+
+pub async fn vcs_log_users(host: &Host, window: &str, repo: Option<PathBuf>) -> IdeResult<Vec<String>> {
+    let project = LogAccess::new(host, window, repo.as_deref());
+    blocking(move || project.with_log_repo_at(repo.as_deref(), |r| r.log_users())).await
+}
+
+pub async fn vcs_open_external_log(host: &Host, window: &str, path: PathBuf) -> IdeResult<ide_core::IpcPath> {
+    let path = dunce::canonicalize(path)?;
+    let repo = Repo::discover(&path)?.ok_or_else(|| ide_core::IdeError::unavailable("folder is not a Git worktree"))?;
+    let root = repo.root().to_path_buf();
+    repo.set_execution_allowed(false);
+    repo.enable_log_index(&host.local_data_dir.join("cache/git-log"));
+    if let Ok(project) = host.project(window) {
+        project.open_external_log(&root)?;
+    }
+    let mut logs = host.external_logs.write();
+    let roots = logs.entry(host.owner_window(window).to_string()).or_default();
+    if !roots.iter().any(|r| r.root() == root) {
+        roots.push(std::sync::Arc::new(repo));
+    }
+    Ok(root.into())
+}
+
+pub async fn vcs_log_details(
+    host: &Host,
+    window: &str,
+    repo: Option<PathBuf>,
+    revision: String,
+) -> IdeResult<LogDetails> {
+    let project = LogAccess::new(host, window, repo.as_deref());
+    blocking(move || project.with_log_repo_at(repo.as_deref(), |r| r.log_details(&revision))).await
+}
+
+pub async fn vcs_log_details_batch(
+    host: &Host,
+    window: &str,
+    repo: Option<PathBuf>,
+    revisions: Vec<String>,
+    request: RequestId,
+) -> IdeResult<Vec<LogDetails>> {
+    let project = LogAccess::new(host, window, repo.as_deref());
+    let cancel = host.begin_project_read_request(window, request);
+    let result = blocking(move || {
+        project.with_log_repo_at(repo.as_deref(), |r| {
+            revisions.iter().map(|id| r.log_details_cancellable(id, &cancel)).collect()
+        })
+    })
+    .await;
+    host.end_request(request);
+    result
+}
+
+pub async fn vcs_log_index(
+    host: &Host,
+    window: &str,
+    repo: Option<PathBuf>,
+    request: Option<RequestId>,
+) -> IdeResult<LogIndexProgress> {
+    let project = LogAccess::new(host, window, repo.as_deref());
+    let cancel =
+        request.map_or_else(ide_core::CancellationToken::new, |id| host.begin_project_read_request(window, id));
+    let result = blocking(move || {
+        project.with_log_repo_at(repo.as_deref(), |r| {
+            r.enable_log_index(&project.cache);
+            if request.is_some() { r.index_log(&cancel) } else { Ok(r.log_index_progress()) }
+        })
+    })
+    .await;
+    if let Some(request) = request {
+        host.end_request(request);
+    }
+    result
+}
+
+pub async fn vcs_revision_children(
+    host: &Host,
+    window: &str,
+    repo: Option<PathBuf>,
+    revision: String,
+    directory: String,
+) -> IdeResult<Vec<String>> {
+    let project = LogAccess::new(host, window, repo.as_deref());
+    blocking(move || project.with_log_repo_at(repo.as_deref(), |r| r.revision_children(&revision, &directory))).await
+}
+
+pub async fn vcs_revision_files(
+    host: &Host,
+    window: &str,
+    repo: Option<PathBuf>,
+    revision: String,
+) -> IdeResult<Vec<String>> {
+    let project = LogAccess::new(host, window, repo.as_deref());
+    blocking(move || project.with_log_repo_at(repo.as_deref(), |r| r.revision_files(&revision))).await
 }

 pub async fn vcs_commit_files(
@@ -233,8 +454,8 @@ pub async fn vcs_commit_files(
    repo: Option<PathBuf>,
    commit: String,
 ) -> IdeResult<Vec<ChangedFile>> {
-    let project = host.project(window)?;
-    blocking(move || project.with_repo_at(repo.as_deref(), |r| r.commit_files(&commit))).await
+    let project = LogAccess::new(host, window, repo.as_deref());
+    blocking(move || project.with_log_repo_at(repo.as_deref(), |r| r.commit_files(&commit))).await
 }

 /// Combined changes of several commits, `commits` oldest first.
@@ -244,13 +465,13 @@ pub async fn vcs_commits_changes(
    repo: Option<PathBuf>,
    commits: Vec<String>,
 ) -> IdeResult<Vec<RevisionChange>> {
-    let project = host.project(window)?;
-    blocking(move || project.with_repo_at(repo.as_deref(), |r| r.commits_changes(&commits))).await
+    let project = LogAccess::new(host, window, repo.as_deref());
+    blocking(move || project.with_log_repo_at(repo.as_deref(), |r| r.commits_changes(&commits))).await
 }

 pub async fn vcs_branches(host: &Host, window: &str, repo: Option<PathBuf>) -> IdeResult<Vec<Branch>> {
-    let project = host.project(window)?;
-    blocking(move || project.with_repo_at(repo.as_deref(), |r| r.branches())).await
+    let project = LogAccess::new(host, window, repo.as_deref());
+    blocking(move || project.with_log_repo_at(repo.as_deref(), |r| r.branches())).await
 }

 pub async fn vcs_stashes(host: &Host, window: &str, repo: Option<PathBuf>) -> IdeResult<Vec<Stash>> {
@@ -605,8 +826,8 @@ pub async fn vcs_config_get(
    repo: Option<PathBuf>,
    key: String,
 ) -> IdeResult<Option<String>> {
-    let project = host.project(window)?;
-    blocking(move || project.with_repo_at(repo.as_deref(), |r| r.config_get(&key))).await
+    let project = LogAccess::new(host, window, repo.as_deref());
+    blocking(move || project.with_log_repo_at(repo.as_deref(), |r| r.config_get(&key))).await
 }

 /// Local history operation that may take a while (hooks, large checkouts); git's
@@ -667,8 +888,8 @@ pub async fn vcs_create_tag(
 }

 pub async fn vcs_tags(host: &Host, window: &str, repo: Option<PathBuf>) -> IdeResult<Vec<String>> {
-    let project = host.project(window)?;
-    blocking(move || project.with_repo_at(repo.as_deref(), |r| r.tags())).await
+    let project = LogAccess::new(host, window, repo.as_deref());
+    blocking(move || project.with_log_repo_at(repo.as_deref(), |r| r.tags())).await
 }

 /// Merge dialog: merges `branches` into the current branch.
@@ -704,8 +925,8 @@ pub async fn vcs_rebase_with(
 }

 pub async fn vcs_remotes(host: &Host, window: &str, repo: Option<PathBuf>) -> IdeResult<Vec<Remote>> {
-    let project = host.project(window)?;
-    blocking(move || project.with_repo_at(repo.as_deref(), |r| r.remotes())).await
+    let project = LogAccess::new(host, window, repo.as_deref());
+    blocking(move || project.with_log_repo_at(repo.as_deref(), |r| r.remotes())).await
 }

 pub async fn vcs_edit_remote(host: &Host, window: &str, repo: Option<PathBuf>, edit: RemoteEdit) -> IdeResult<()> {
@@ -792,8 +1013,8 @@ pub async fn vcs_diff_with_worktree(
    repo: Option<PathBuf>,
    rev: String,
 ) -> IdeResult<Vec<ChangedFile>> {
-    let project = host.project(window)?;
-    blocking(move || project.with_repo_at(repo.as_deref(), |r| r.diff_with_worktree(&rev))).await
+    let project = LogAccess::new(host, window, repo.as_deref());
+    blocking(move || project.with_log_repo_at(repo.as_deref(), |r| r.diff_with_worktree(&rev))).await
 }

 /// Files that differ between two revisions (the "N files updated" of Update Project).
@@ -804,8 +1025,8 @@ pub async fn vcs_diff_revisions(
    from: String,
    to: String,
 ) -> IdeResult<Vec<ChangedFile>> {
-    let project = host.project(window)?;
-    blocking(move || project.with_repo_at(repo.as_deref(), |r| r.diff_revisions(&from, &to))).await
+    let project = LogAccess::new(host, window, repo.as_deref());
+    blocking(move || project.with_log_repo_at(repo.as_deref(), |r| r.diff_revisions(&from, &to))).await
 }

 /// The best common ancestor of `a` and `b` (`git merge-base`), if any: the New Pull
@@ -987,7 +1208,30 @@ pub(crate) fn register(d: &mut Dispatcher) {
    d.add("vcs_blame", |c| async move {
        vcs_blame(&c.host, &c.window, c.arg("path")?, c.arg("text")?, c.arg("revision")?).await
    });
+    d.add("vcs_block_history", |c| async move {
+        let (request, path, text, lines) = (c.arg("request")?, c.arg("path")?, c.arg("text")?, c.arg("lines")?);
+        vcs_block_history(&c.host, &c.window, request, path, text, lines).await
+    });
    d.add("vcs_log", |c| async move { vcs_log(&c.host, &c.window, c.arg("repo")?, c.arg("query")?).await });
+    d.add("vcs_log_refs", |c| async move { vcs_log_refs(&c.host, &c.window, c.arg("repo")?).await });
+    d.add("vcs_log_users", |c| async move { vcs_log_users(&c.host, &c.window, c.arg("repo")?).await });
+    d.add("vcs_open_external_log", |c| async move { vcs_open_external_log(&c.host, &c.window, c.arg("path")?).await });
+    d.add("vcs_log_details", |c| async move {
+        vcs_log_details(&c.host, &c.window, c.arg("repo")?, c.arg("revision")?).await
+    });
+    d.add("vcs_log_details_batch", |c| async move {
+        vcs_log_details_batch(&c.host, &c.window, c.arg("repo")?, c.arg("revisions")?, c.arg("request")?).await
+    });
+    d.add(
+        "vcs_log_index",
+        |c| async move { vcs_log_index(&c.host, &c.window, c.arg("repo")?, c.arg("request")?).await },
+    );
+    d.add("vcs_revision_children", |c| async move {
+        vcs_revision_children(&c.host, &c.window, c.arg("repo")?, c.arg("revision")?, c.arg("directory")?).await
+    });
+    d.add("vcs_revision_files", |c| async move {
+        vcs_revision_files(&c.host, &c.window, c.arg("repo")?, c.arg("revision")?).await
+    });
    d.add("vcs_commit_files", |c| async move {
        vcs_commit_files(&c.host, &c.window, c.arg("repo")?, c.arg("commit")?).await
    });
@@ -667,6 +667,17 @@ impl HostApi for PluginApi {
        Ok(())
    }

+    fn open_location(&self, client: Option<&str>, path: &Path, line: u32, column: u32) -> Result<(), HostError> {
+        let event = PluginEvent::OpenLocation {
+            plugin_id: self.id().to_owned(),
+            path: path.to_path_buf().into(),
+            line,
+            column,
+        };
+        self.shared.sink.emit(client, event);
+        Ok(())
+    }
+
    fn setting(&self, root: Option<&Path>, key: &str) -> Option<String> {
        let schema: Vec<super::ui_points::SettingSchema> = self
            .shared
@@ -3,11 +3,14 @@
 //! plugins, and revocations. The host keeps the last index it read
 //! (`market-index.json`), checks signatures against it, and disables what it
 //! revokes — at start-up and on every refresh (the desktop refreshes daily).
+//! Release builds pin the official publisher to the keys they were built
+//! with, so no index can sign `openidea.*` plugins with another key.

-use super::{PackageFile, PluginHost, PluginSource, PluginStatus};
+use super::{PackageFile, PluginEvent, PluginHost, PluginSource, PluginStatus, PluginUpdate, install};
 use ide_core::{IdeError, IdeResult};
 use ide_extension::package::{self, Index, IndexEntry, PackageSignature, SIGNATURE_FILE};
 use ide_extension::{MANIFEST_FILE, Manifest};
+use semver::Version;
 use serde::{Deserialize, Serialize};
 use std::path::{Path, PathBuf};

@@ -15,6 +18,9 @@ use std::path::{Path, PathBuf};
 /// the app, next to the signed packages of the official plugins.
 pub const OFFICIAL_INDEX: &str = "https://github.com/l0ng-ai/openidea/releases/latest/download/plugins-index.json";

+/// The publisher of the official plugins.
+pub const OFFICIAL_PUBLISHER: &str = "openidea";
+
 /// The last index read, in the plugins directory.
 pub const INDEX_FILE: &str = "market-index.json";
 const DOWNLOADS: &str = ".downloads";
@@ -22,6 +28,8 @@ const MAX_INDEX: usize = 16 << 20;
 const MAX_PACKAGE: usize = 256 << 20;
 const MAX_STAGED_FILES: usize = 256;
 const MAX_STAGED_BYTES: usize = 16 << 20;
+/// `moved` links followed before giving up (a loop, or a misconfiguration).
+const MAX_MOVES: usize = 3;

 /// A marketplace entry with what is installed.
 #[derive(Clone, Debug, Serialize, Deserialize, specta::Type)]
@@ -31,6 +39,32 @@ pub struct MarketPlugin {
    pub entry: IndexEntry,
    /// Installed version, if any.
    pub installed: Option<String>,
+    /// Whether this IDE can load `entry` (the newest version it can, else the newest).
+    pub compatible: bool,
+}
+
+impl MarketPlugin {
+    /// A version this IDE can load, newer than the one installed.
+    pub fn is_update(&self) -> bool {
+        let newer = |installed: &String| match (Version::parse(&self.entry.version), Version::parse(installed)) {
+            (Ok(offered), Ok(installed)) => offered > installed,
+            _ => false,
+        };
+        self.compatible && self.installed.as_ref().is_some_and(newer)
+    }
+}
+
+/// The official publisher's keys this IDE was built with
+/// (`OPENIDEA_OFFICIAL_PLUGIN_KEYS`: base64, comma-separated). Development
+/// builds have none: the index decides.
+pub(super) fn built_in_official_keys() -> Vec<String> {
+    let keys = option_env!("OPENIDEA_OFFICIAL_PLUGIN_KEYS").unwrap_or_default();
+    keys.split(',').map(str::trim).filter(|k| !k.is_empty()).map(str::to_owned).collect()
+}
+
+fn pinned(mut index: Index, official_keys: &[String]) -> Index {
+    index.pin_publisher(OFFICIAL_PUBLISHER, "OpenIDEA", official_keys);
+    index
 }

 /// Reads `url`: `http(s)://…`, `file://…` or a local path.
@@ -58,6 +92,33 @@ pub fn read_url(url: &str, max: usize) -> Result<Vec<u8>, String> {
    Ok(bytes)
 }

+/// The index at `url`, following `moved`, with downloads made absolute against
+/// where it was read from.
+fn read_index(url: &str) -> IdeResult<Index> {
+    let mut url = url.to_owned();
+    for _ in 0..=MAX_MOVES {
+        let bytes = read_url(&url, MAX_INDEX).map_err(IdeError::unavailable)?;
+        let text = String::from_utf8(bytes).map_err(|_| IdeError::invalid("the index is not UTF-8"))?;
+        let mut index = Index::parse(&text).map_err(IdeError::invalid)?;
+        match index.moved.take().filter(|m| !m.trim().is_empty()) {
+            Some(next) => {
+                let next = resolve(&url, &next);
+                if url.starts_with("https://") && !next.starts_with("https://") {
+                    return Err(IdeError::invalid(format!("the marketplace moved to {next}, which isn't https")));
+                }
+                url = next;
+            }
+            None => {
+                for e in &mut index.plugins {
+                    e.download = resolve(&url, &e.download);
+                }
+                return Ok(index);
+            }
+        }
+    }
+    Err(IdeError::unavailable(format!("the marketplace index moved more than {MAX_MOVES} times")))
+}
+
 /// `href` relative to the index at `base`: a URL, or a local path (with the
 /// platform's separators, e.g. `C:\\market\\index.json`).
 pub fn resolve(base: &str, href: &str) -> String {
@@ -77,9 +138,16 @@ pub fn resolve(base: &str, href: &str) -> String {
 }

 impl PluginHost {
-    pub(super) fn load_market_index(dir: &Path) -> Option<Index> {
+    pub(super) fn load_market_index(dir: &Path, official_keys: &[String]) -> Option<Index> {
        let text = std::fs::read_to_string(dir.join(INDEX_FILE)).ok()?;
-        Index::parse(&text).map_err(|e| tracing::warn!("{INDEX_FILE}: {e}")).ok()
+        let index = Index::parse(&text).map_err(|e| tracing::warn!("{INDEX_FILE}: {e}")).ok()?;
+        Some(pinned(index, official_keys))
+    }
+
+    /// Pins the official publisher to `keys` (base64) instead of the built-in
+    /// ones, from the next index read.
+    pub fn set_official_keys(&self, keys: Vec<String>) {
+        *self.official_keys.write() = keys;
    }

    /// The marketplace index URL: the user's, else the default (none: no marketplace).
@@ -97,14 +165,26 @@ impl PluginHost {
        self.save_state();
    }

-    /// Reads the index again, keeps it, and applies its revocations.
+    /// The marketplace's plugins: read again when `refresh`, else the last index
+    /// read. Reads it when none has been read yet (first run, nothing cached).
+    pub fn market_listing(&self, refresh: bool) -> IdeResult<Vec<MarketPlugin>> {
+        if refresh || (self.market.read().is_none() && self.market_url().is_some()) {
+            self.refresh_market()
+        } else {
+            Ok(self.market_plugins())
+        }
+    }
+
+    /// Reads the index again, keeps it, and applies its revocations. Announces
+    /// updates of installed plugins it hasn't announced yet.
    pub fn refresh_market(&self) -> IdeResult<Vec<MarketPlugin>> {
        let url = self.market_url().ok_or_else(|| IdeError::unavailable("no plugin marketplace is configured"))?;
-        let bytes = read_url(&url, MAX_INDEX).map_err(IdeError::unavailable)?;
-        let text = String::from_utf8(bytes).map_err(|_| IdeError::invalid("the index is not UTF-8"))?;
-        let index = Index::parse(&text).map_err(IdeError::invalid)?;
-        let _ = std::fs::write(self.plugins_dir.join(INDEX_FILE), &text);
-        *self.market.write() = Some(index);
+        let index = read_index(&url)?;
+        if let Ok(json) = serde_json::to_string(&index) {
+            let _ = std::fs::write(self.plugins_dir.join(INDEX_FILE), json);
+        }
+        let newer = index.is_newer().then_some(index.format);
+        *self.market.write() = Some(pinned(index, &self.official_keys.read()));
        // Trust may have changed: who signed what, what is revoked.
        let installed: Vec<_> =
            self.plugins.read().values().filter(|p| p.source == PluginSource::Installed).cloned().collect();
@@ -113,7 +193,41 @@ impl PluginHost {
            plugin.meta.lock().publisher = publisher;
        }
        self.apply_revocations();
-        Ok(self.market_plugins())
+        if let Some(format) = newer {
+            return Err(IdeError::unavailable(format!(
+                "the marketplace needs a newer OpenIDEA (index format {format}); its revocations still apply"
+            )));
+        }
+        let plugins = self.market_plugins();
+        self.announce_updates(&plugins);
+        Ok(plugins)
+    }
+
+    /// Tells the windows about updates once per set of versions: a later
+    /// refresh offering the same ones says nothing.
+    fn announce_updates(&self, plugins: &[MarketPlugin]) {
+        let updates: Vec<PluginUpdate> = plugins
+            .iter()
+            .filter(|p| p.is_update())
+            .map(|p| PluginUpdate {
+                id: p.entry.id.clone(),
+                name: p.entry.name.clone(),
+                version: p.entry.version.clone(),
+            })
+            .collect();
+        let key: Vec<String> = updates.iter().map(|u| format!("{}@{}", u.id, u.version)).collect();
+        if std::mem::replace(&mut *self.announced_updates.lock(), key.clone()) != key && !updates.is_empty() {
+            self.emit(None, PluginEvent::UpdatesAvailable { updates });
+        }
+    }
+
+    /// Whether the package in `src` would replace the installed `id`'s copy
+    /// with one signed by another key than that copy, without that key's
+    /// endorsement: the user confirms the change of signer.
+    pub(super) fn signer_changed(&self, id: &str, src: &Path) -> bool {
+        let Some(current) = install::active_dir(&self.plugins_dir.join(id)) else { return false };
+        let market = self.market.read();
+        !package::signer_continues(market.as_ref(), read_signature(&current).as_ref(), read_signature(src).as_ref())
    }

    /// The plugins of the last index read.
@@ -121,16 +235,14 @@ impl PluginHost {
        let Some(index) = self.market.read().clone() else { return Vec::new() };
        let plugins = self.plugins.read();
        index
-            .plugins
-            .iter()
-            .filter(|e| index.revocation(&e.id, &e.version).is_none())
-            .cloned()
-            .map(|entry| {
+            .offered()
+            .into_iter()
+            .map(|(entry, compatible)| {
                let installed = plugins
                    .get(&entry.id)
                    .filter(|p| p.source == PluginSource::Installed)
                    .map(|p| p.manifest().version.clone());
-                MarketPlugin { entry, installed }
+                MarketPlugin { entry: entry.clone(), installed, compatible }
            })
            .collect()
    }
@@ -141,12 +253,18 @@ impl PluginHost {
    pub fn download_market_plugin(&self, id: &str) -> IdeResult<PathBuf> {
        let url = self.market_url().ok_or_else(|| IdeError::unavailable("no plugin marketplace is configured"))?;
        let index = self.market.read().clone().ok_or_else(|| IdeError::unavailable("refresh the marketplace first"))?;
-        let entry = index
-            .plugins
-            .iter()
-            .find(|e| e.id == id)
-            .cloned()
+        let (entry, compatible) = index
+            .offered()
+            .into_iter()
+            .find(|(e, _)| e.id == id)
+            .map(|(e, ok)| (e.clone(), ok))
            .ok_or_else(|| IdeError::not_found(format!("{id} is not in the marketplace")))?;
+        if !compatible {
+            return Err(IdeError::unavailable(format!(
+                "{} {} needs plugin API {}: update OpenIDEA",
+                entry.name, entry.version, entry.engine
+            )));
+        }
        let bytes = read_url(&resolve(&url, &entry.download), MAX_PACKAGE).map_err(IdeError::unavailable)?;
        let downloads = self.plugins_dir.join(DOWNLOADS);
        std::fs::create_dir_all(&downloads)?;
@@ -36,7 +36,10 @@ pub mod web;

 pub use api::{FileSecretStore, HostWorkspace, PluginWorkspace, SecretStore};
 pub use icons::{map_asset as icon_theme_map_asset, sanitize_svg, svg_prefix as icon_theme_svg_prefix};
-pub use market::{INDEX_FILE as MARKET_INDEX_FILE, MarketPlugin, OFFICIAL_INDEX as OFFICIAL_MARKET_INDEX};
+pub use market::{
+    INDEX_FILE as MARKET_INDEX_FILE, MarketPlugin, OFFICIAL_INDEX as OFFICIAL_MARKET_INDEX, OFFICIAL_PUBLISHER,
+    read_url as read_market_url, resolve as resolve_market_href,
+};
 pub use points::{COMMANDS, CommandDecl, register_builtin_points};
 pub(crate) use providers::editor_providers as editor_providers_for;
 pub use providers::{ProviderKind, set_editor_providers};
@@ -242,12 +245,16 @@ pub struct Consent {
    /// Optional capabilities the user accepted (`net:crates.io`, …). Required
    /// ones are implied by consenting at all.
    pub optional: Vec<String>,
+    /// The user accepted a package signed by another key than the installed
+    /// copy ([`InstallPreview::signer_changed`]).
+    #[serde(default)]
+    pub signer_change: bool,
 }

 impl Consent {
    /// Accept everything the plugin asks for (tests, trusted official plugins).
    pub fn all() -> Self {
-        Self { optional: vec!["*".into()] }
+        Self { optional: vec!["*".into()], signer_change: true }
    }

    fn accepts(&self, cap: &Capability) -> bool {
@@ -274,6 +281,14 @@ pub struct InstallPreview {
    pub unsigned: bool,
    /// The verified publisher.
    pub publisher: Option<String>,
+    /// Replaces an installed copy signed with another key, which didn't
+    /// endorse this package's (or this one is unsigned): the user confirms it
+    /// ([`Consent::signer_change`]).
+    pub signer_changed: bool,
+    /// Something to confirm: a first install, an unsigned package, another
+    /// signer, or capabilities the installed version wasn't granted or
+    /// refused. Without, an update installs with the grants it has.
+    pub needs_consent: bool,
 }

 type ProjectPolicy = Arc<dyn Fn(&Path) -> bool + Send + Sync>;
@@ -320,6 +335,10 @@ pub struct PluginHost {
    pins: Arc<RwLock<HashMap<(String, String), ProgramPin>>>,
    /// The last marketplace index read: trust root for signatures, revocations.
    market: RwLock<Option<ide_extension::package::Index>>,
+    /// The official publisher's keys the index is pinned to (none: as listed).
+    official_keys: RwLock<Vec<String>>,
+    /// `id@version` of the updates last announced.
+    announced_updates: Mutex<Vec<String>>,
    /// The marketplace used while the user has set none (the app's official one).
    default_market_url: RwLock<Option<String>>,
    /// Updates not confirmed yet (the new version hasn't started once): what
@@ -358,9 +377,12 @@ impl PluginHost {
            policy_pins.read().get(&(plugin.to_owned(), cap.to_string())).cloned()
        }));
        let shared = api::Shared::new(sink.clone(), plugins_dir.join(".data"), pins.clone(), ui.clone());
-        let market = RwLock::new(Self::load_market_index(&plugins_dir));
+        let official_keys = market::built_in_official_keys();
+        let market = RwLock::new(Self::load_market_index(&plugins_dir, &official_keys));
        let host = Self {
            market,
+            official_keys: RwLock::new(official_keys),
+            announced_updates: Mutex::default(),
            default_market_url: RwLock::new(None),
            updates: Mutex::default(),
            project_policy: RwLock::new(Arc::new(|_| false)),
@@ -703,14 +725,27 @@ impl PluginHost {
        }
        let publisher = self.verified_publisher(src);
        let m = &pkg.manifest;
+        let replaces = self.plugins.read().get(&m.id).map(|p| p.manifest().version.clone());
+        // An update shows what the installed version was granted.
+        let grant = replaces
+            .as_ref()
+            .and_then(|_| self.ledger.lock().get(&Subject::Installed(m.id.clone())).cloned())
+            .filter(|g| g.confirmed);
+        let granted = |c: &Capability| grant.as_ref().is_some_and(|g| g.has(c));
        let mut capabilities: Vec<CapabilityInfo> =
-            m.capabilities.all().map(|c| CapabilityInfo::new(c, m.capabilities.is_optional(c), false)).collect();
+            m.capabilities.all().map(|c| CapabilityInfo::new(c, m.capabilities.is_optional(c), granted(c))).collect();
        for extra in &set.capabilities {
            if !m.declares(extra) {
-                capabilities.push(CapabilityInfo::new(extra, true, false));
+                capabilities.push(CapabilityInfo::new(extra, true, granted(extra)));
            }
        }
        capabilities.sort_by(|a, b| b.risk.cmp(&a.risk).then(a.id.cmp(&b.id)));
+        let signer_changed = self.signer_changed(&m.id, src);
+        let answered = |c: &CapabilityInfo| {
+            c.granted || (c.optional && grant.as_ref().is_some_and(|g| g.declined.contains(&c.id)))
+        };
+        let needs_consent =
+            grant.is_none() || publisher.is_none() || signer_changed || !capabilities.iter().all(answered);
        Ok(InstallPreview {
            id: m.id.clone(),
            name: m.name.clone(),
@@ -721,9 +756,11 @@ impl PluginHost {
            capabilities,
            contributions: counts(m),
            warnings: set.warnings.clone(),
-            replaces: self.plugins.read().get(&m.id).map(|p| p.manifest().version.clone()),
+            replaces,
            unsigned: publisher.is_none(),
            publisher,
+            signer_changed,
+            needs_consent,
        })
    }

@@ -746,6 +783,11 @@ impl PluginHost {
        if let Some(problem) = self.signature_problem(src) {
            return Err(IdeError::invalid(format!("refusing {id}: {problem}")));
        }
+        if !consent.signer_change && self.signer_changed(&id, src) {
+            return Err(IdeError::invalid(format!(
+                "refusing {id}: it is signed by another key than the installed version; confirm the change of signer"
+            )));
+        }
        let version = pkg.manifest.version.clone();
        if let Some(r) = self.market.read().as_ref().and_then(|i| i.revocation(&id, &version)) {
            return Err(IdeError::invalid(format!("{id} {version} was revoked: {}", r.reason)));
@@ -2211,6 +2253,7 @@ fn placeholder_manifest(dir: &Path) -> Manifest {
        homepage: None,
        license: None,
        change_notes: None,
+        declared_categories: Vec::new(),
        engine: ide_extension::ENGINE_VERSION.into(),
        legacy: false,
        wasm: None,
@@ -292,6 +292,21 @@ impl PluginHost {
        .collect()
    }

+    /// The edits of an action `plugin_id` returned with `data`, now that the
+    /// user picked it: a call with the command budget, not the edit path's.
+    pub fn resolve_code_action(
+        &self,
+        plugin_id: &str,
+        doc: &ProviderDocument,
+        action: CodeAction,
+    ) -> ide_core::IdeResult<CodeAction> {
+        let d = Arc::new(doc.clone());
+        let timeout = self.limits.timeout;
+        self.code_call(plugin_id, ide_plugin::Invocation::default(), "resolving the code action", move |rt, _| {
+            rt.resolve_code_action(&d, &action, timeout)
+        })
+    }
+
    pub fn provide_definition(&self, doc: &ProviderDocument, at: ide_core::Pos) -> Vec<Location> {
        let d = Arc::new(doc.clone());
        self.edit_calls(ProviderKind::Definition, &doc.language, move |rt, timeout| {
@@ -114,6 +114,7 @@ pub fn forwarded(event: &PluginEvent) -> bool {
            | PluginEvent::ViewChanged { .. }
            | PluginEvent::ViewMessage { .. }
            | PluginEvent::OpenTerminal { .. }
+            | PluginEvent::OpenLocation { .. }
    )
 }

@@ -272,7 +273,8 @@ impl RemotePlugins {
                report.failed.push(format!("{}: invalid plugin id", pkg.id));
                continue;
            }
-            let consent = Consent { optional: pkg.granted.clone() };
+            // The desktop asked the user, change of signer included.
+            let consent = Consent { optional: pkg.granted.clone(), signer_change: true };
            if self.current_digest(&pkg.id).as_deref() == Some(pkg.digest.as_str()) {
                if let Err(e) = self.follow_grants(&pkg, &consent) {
                    report.failed.push(format!("{}: {e}", pkg.id));
@@ -138,12 +138,24 @@ pub struct PluginsSnapshot {
    pub ui: Vec<UiContribution>,
 }

+/// A newer version of an installed plugin in the marketplace.
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct PluginUpdate {
+    pub id: String,
+    pub name: String,
+    pub version: String,
+}
+
 /// Backend → UI notifications (Tauri event `ide://plugin`).
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Type)]
 #[serde(tag = "type", rename_all = "camelCase")]
 pub enum PluginEvent {
    /// Plugins, their status or their contributions changed: re-fetch `plugin_list`.
    CommandsChanged,
+    /// The marketplace offers newer versions of installed plugins (announced
+    /// once per set of versions).
+    UpdatesAvailable { updates: Vec<PluginUpdate> },
    #[serde(rename_all = "camelCase")]
    Notification { plugin_id: String, level: NotificationLevel, title: String, body: String },
    /// A plugin's status bar item was set (`item`) or removed.
@@ -180,6 +192,8 @@ pub enum PluginEvent {
        args: Vec<String>,
        cwd: ide_core::IpcPath,
    },
+    #[serde(rename_all = "camelCase")]
+    OpenLocation { plugin_id: String, path: ide_core::IpcPath, line: u32, column: u32 },
    /// Plugin languages, or the servers they may start, changed: re-fetch
    /// `languages` (the host re-detects open documents: [`crate::Host::plugin_languages_changed`]).
    LanguagesChanged,
@@ -378,9 +378,19 @@ pub(super) fn view(pkg: &Package, decl: toml::Value) -> Result<UiDecl, String> {
    }
    let mut out = UiDecl::new(d.id.clone(), d.title.clone(), json(&d)?);
    out.files = files;
+    if let Some(icon) = d.icon.as_deref().filter(|i| i.ends_with(".svg")) {
+        let path = std::path::PathBuf::from(icon);
+        let svg = super::icons::read_icon(pkg, &path)?;
+        out.assets.push((view_icon_asset(&d.id), svg));
+        out.files.push(path);
+    }
    Ok(out)
 }

+pub fn view_icon_asset(id: &str) -> String {
+    format!("viewIcon/{id}")
+}
+
 #[derive(Debug, Deserialize, Serialize)]
 #[serde(deny_unknown_fields)]
 struct CustomEditorDecl {
@@ -34,6 +34,8 @@ pub struct Project {
    pub lsp: Arc<LspManager>,
    /// Git repositories: the one containing the project root and those nested below it.
    pub repos: Arc<RwLock<Repos>>,
+    /// Explicitly opened external logs remain read-only and outside project indexing.
+    pub(crate) external_log_repos: RwLock<Vec<Arc<Repo>>>,
    /// Incrementally maintained syntax trees of the open documents.
    pub syntax: Arc<SyntaxCache>,
    /// Tree-sitter structure queries (LSP fallback) over `syntax`.
@@ -56,6 +58,9 @@ pub struct Project {
    pub(crate) watcher: Watcher,
    /// Watchers of the Project Structure content roots outside the project folder.
    pub(crate) content_watchers: Mutex<Vec<(PathBuf, Watcher)>>,
+    /// Watchers of folders outside the project that language servers registered file
+    /// watchers for (a virtualenv elsewhere, a path dependency).
+    lsp_watchers: Mutex<Vec<(PathBuf, Watcher)>>,
    pub(crate) _scratch_watcher: Option<Watcher>,
    /// A LightEdit window's loose files ([`Host::open_light`]): global settings only,
    /// nothing indexed, no language servers, repositories or project services.
@@ -83,6 +88,7 @@ impl Host {
            return Ok(current);
        }
        self.close_project(window);
+        self.wait_detached_closes();
        let sink: SharedSink = (self.sink_for)(window);
        // Before anything the project starts: its children get the project's environment.
        let trusted = Arc::new(AtomicBool::new(self.trust.trusted(&root)?));
@@ -204,6 +210,7 @@ impl Host {
                        cfg.launch_error = Some(e);
                        None
                    });
+                    ide_sdk::apply::configure_java_compiler(cfg, &data_dir, &effective.inspections);
                    ide_sdk::java::configure_jdtls(
                        cfg,
                        server_root,
@@ -218,6 +225,8 @@ impl Host {
                    ide_sdk::jdtls::launch_directly(cfg);
                }
                ide_sdk::apply::server_protocol_overrides(cfg, &effective);
+                // After the overrides: the PHP version they may set decides the storage.
+                ide_sdk::php::configure_intelephense_storage(cfg, &data_dir);
                if cfg.name == "jdtls" {
                    let (excluded_poms, build_files) = jdtls_maven_import(root, &effective);
                    ide_sdk::apply::configure_maven_import(cfg, root, &excluded_poms, build_files.as_deref());
@@ -302,12 +311,16 @@ impl Host {
                sink.clone(),
                Box::new(move |batch| {
                    let changed: Vec<PathBuf> = batch.created.iter().chain(&batch.modified).cloned().collect();
-                    index.update(&changed, &batch.removed);
+                    let (ignored, ignored_gone) = ignored_changes(batch);
+                    index.update(&[&changed[..], &ignored].concat(), &[&batch.removed[..], &ignored_gone].concat());
                    kotlin_bridge.files_changed(changed.iter().chain(&batch.removed));
                    lsp.project_files_changed(batch.created.iter().chain(&batch.removed));
-                    lsp.watched_files_changed(&batch.created, &batch.modified, &batch.removed);
+                    lsp.watched_files_changed(&batch.created, &batch.modified, &batch.removed, &batch.excluded_dirs);
+                    if composer_changed(&root, changed.iter().chain(&batch.removed)) {
+                        lsp.reconfigure_soon();
+                    }
                    // Atomic saves by external tools surface as `created`.
-                    documents.on_disk_changed(&changed);
+                    documents.on_disk_changed(&[&changed[..], &ignored].concat());
                    // A framework's root marker (`angular.json`) created or deleted: its
                    // templates gain or lose their mode. Markers in `node_modules` only
                    // count here when the folder isn't excluded (it is by default).
@@ -411,7 +424,16 @@ impl Host {
        let content_watchers = extra_roots
            .iter()
            .filter_map(|r| {
-                let w = content_root_watcher(r, &excludes, &sink, &index, &documents, &history, Some(&kotlin_bridge))?;
+                let w = content_root_watcher(
+                    r,
+                    &excludes,
+                    &sink,
+                    &index,
+                    &documents,
+                    &history,
+                    &lsp,
+                    Some(&kotlin_bridge),
+                )?;
                Some((r.clone(), w))
            })
            .collect();
@@ -444,6 +466,7 @@ impl Host {
            index,
            lsp,
            repos,
+            external_log_repos: RwLock::default(),
            structure: Arc::new(StructureService::new(syntax.clone())),
            syntax,
            detected_roots,
@@ -458,6 +481,7 @@ impl Host {
            kotlin_bridge: Some(kotlin_bridge),
            watcher,
            content_watchers: Mutex::new(content_watchers),
+            lsp_watchers: Mutex::new(Vec::new()),
            _scratch_watcher: scratch_watcher,
            light: false,
        });
@@ -467,6 +491,14 @@ impl Host {
                weak.upgrade().map(|p| p.reference_candidates(q, cancel)).unwrap_or_default()
            }));
        }
+        {
+            let weak = Arc::downgrade(&project);
+            project.lsp.set_file_watch_roots_hook(Box::new(move |roots| {
+                if let Some(p) = weak.upgrade() {
+                    p.watch_for_language_servers(roots);
+                }
+            }));
+        }
        {
            let weak = Arc::downgrade(&project);
            project.lsp.set_project_excludes_hook(Box::new(move || {
@@ -489,12 +521,15 @@ impl Host {
        root: &Path,
        project_key: &str,
    ) -> (Arc<ide_db::DbManager>, Arc<ide_http::History>, Arc<ide_agent::AgentManager>) {
-        let db = Arc::new(ide_db::DbManager::new(
-            root.to_path_buf(),
-            self.data_dir.join("db-passwords.json"),
-            self.data_dir.join("db-history.json"),
-            self.ssh.clone(),
-        ));
+        let db = Arc::new(
+            ide_db::DbManager::new(
+                root.to_path_buf(),
+                self.data_dir.join("db-passwords.json"),
+                self.data_dir.join("db-history.json"),
+                self.ssh.clone(),
+            )
+            .with_global_sources(self.data_dir.clone()),
+        );
        let http_history = Arc::new(ide_http::History::new(self.data_dir.join("http-history").join(project_key)));
        let agents = Arc::new(ide_agent::AgentManager::new(
            ide_agent::AgentPaths {
@@ -536,6 +571,7 @@ impl Host {
            return Ok(current);
        }
        self.close_project(window);
+        self.wait_detached_closes();
        let sink: SharedSink = (self.sink_for)(window);
        let settings = Arc::new(SettingsStore::load(&self.config_dir, None));
        let effective = settings.effective();
@@ -568,6 +604,7 @@ impl Host {
            index,
            lsp,
            repos: Arc::default(),
+            external_log_repos: RwLock::default(),
            structure: Arc::new(StructureService::new(syntax.clone())),
            syntax,
            detected_roots: Arc::default(),
@@ -582,6 +619,7 @@ impl Host {
            kotlin_bridge: None,
            watcher,
            content_watchers: Mutex::new(Vec::new()),
+            lsp_watchers: Mutex::new(Vec::new()),
            _scratch_watcher: None,
            light: true,
            root: dir,
@@ -664,7 +702,14 @@ fn scan_repositories(
    build_cache: &Path,
 ) {
    let ignored = settings.effective().ignored_names();
-    let skip = |p: &Path| p.file_name().is_some_and(|n| ignored.is_ignored_name(&n.to_string_lossy()));
+    let skip = |p: &Path| {
+        p.file_name().is_some_and(|n| {
+            let name = n.to_string_lossy();
+            ignored.is_ignored_name(&name)
+                || (ide_workspace::unity::GENERATED_DIRS.contains(&name.as_ref())
+                    && p.parent().is_some_and(ide_workspace::unity::is_project))
+        })
+    };
    let mut roots = vec![root.to_path_buf()];
    roots.extend(content_roots(&settings.effective(), root, build_cache));
    match Repos::discover_roots(&roots, &skip) {
@@ -711,6 +756,51 @@ impl Project {
        }
    }

+    pub fn open_external_log(&self, path: &Path) -> IdeResult<PathBuf> {
+        let root = dunce::canonicalize(path)?;
+        let repo = Repo::discover(&root)?.ok_or_else(|| IdeError::unavailable("folder is not a Git worktree"))?;
+        let root = repo.root().to_path_buf();
+        repo.set_execution_allowed(false);
+        let mut external = self.external_log_repos.write();
+        if !external.iter().any(|r| r.root() == root) {
+            external.push(Arc::new(repo));
+        }
+        Ok(root)
+    }
+
+    /// Log read operations may also use an explicitly opened external worktree.
+    /// Mutations continue to use `with_repo_at` and cannot reach these repositories.
+    pub fn with_log_repo_at<T>(&self, at: Option<&Path>, f: impl FnOnce(&Repo) -> IdeResult<T>) -> IdeResult<T> {
+        if let Some(path) = at
+            && self.repos().at_root(path).is_none()
+        {
+            let repo = self
+                .external_log_repos
+                .read()
+                .iter()
+                .find(|r| r.root() == path)
+                .cloned()
+                .ok_or_else(|| IdeError::unavailable("external Git log is not open"))?;
+            return f(&repo);
+        }
+        self.with_repo_at(at, f)
+    }
+
+    pub fn with_log_repo_of<T>(&self, path: &Path, f: impl FnOnce(&Repo) -> IdeResult<T>) -> IdeResult<T> {
+        if self.repos().for_path(path).is_some() {
+            return self.with_repo_of(path, f);
+        }
+        let repo = self
+            .external_log_repos
+            .read()
+            .iter()
+            .filter(|r| path.starts_with(r.root()))
+            .max_by_key(|r| r.root().components().count())
+            .cloned()
+            .ok_or_else(|| IdeError::unavailable("path is not in an open Git log"))?;
+        f(&repo)
+    }
+
    /// Runs `f` with the repository `path` (a file or folder) belongs to.
    pub fn with_repo_of<T>(&self, path: &Path, f: impl FnOnce(&Repo) -> IdeResult<T>) -> IdeResult<T> {
        match self.repos().for_path(path) {
@@ -816,7 +906,8 @@ impl Project {

    /// Project files of `q.languages` under `q.root` containing `q.word` as a whole
    /// word (unsaved buffers included; excluded roots, ignored names and
-    /// `.gitignore`d files skipped): the files a references search opens on its server.
+    /// `.gitignore`d folders skipped, while `.gitignore`d files elsewhere count, as
+    /// in IDEA's project scope): the files a references search opens on its server.
    pub fn reference_candidates(
        &self,
        q: &ide_lsp::CandidateQuery,
@@ -894,6 +985,7 @@ impl Project {
                &self.index,
                &self.documents,
                &self.history,
+                &self.lsp,
                self.kotlin_bridge.as_ref(),
            ) {
                watchers.push((r, w));
@@ -925,7 +1017,7 @@ impl Project {
            return encoding_rs::Encoding::for_label(loaded.encoding.as_bytes())
                .ok_or_else(|| ide_core::IdeError::invalid("unknown file encoding"));
        }
-        let bytes = self.with_repo_of(path, |r| r.file_bytes_at(path, rev))?.unwrap_or_default();
+        let bytes = self.with_log_repo_of(path, |r| r.file_bytes_at(path, rev))?.unwrap_or_default();
        Ok(ide_vfs::detect_encoding(&bytes, fallback))
    }

@@ -948,6 +1040,11 @@ const HISTORY_BATCH_LIMIT: usize = 500;

 /// Local History for changes made outside the IDE (other tools, VCS, deletions).
 /// Contents equal to the last snapshot (e.g. the IDE's own saves) are skipped.
+/// The batch's ignored files (`.env`), split into those still on disk and those removed.
+fn ignored_changes(batch: &ide_vfs::FsBatch) -> (Vec<PathBuf>, Vec<PathBuf>) {
+    batch.ignored.iter().cloned().partition(|p| p.symlink_metadata().is_ok())
+}
+
 fn record_external_changes(history: &LocalHistory, changed: &[PathBuf], removed: &[PathBuf]) {
    for path in changed.iter().take(HISTORY_BATCH_LIMIT) {
        if let Err(e) = history.record_file(path, "External change", false) {
@@ -991,6 +1088,31 @@ fn content_roots(settings: &ide_core::settings::Settings, root: &Path, build_cac

 /// Watches a content root outside the project: the index, open documents and
 /// Local History follow its changes like the project folder's.
+impl Project {
+    /// Watches `roots` (outside the project) for the language servers that asked to.
+    fn watch_for_language_servers(&self, roots: Vec<PathBuf>) {
+        let mut watchers = self.lsp_watchers.lock();
+        watchers.retain(|(r, _)| roots.contains(r));
+        for root in roots {
+            if watchers.iter().any(|(r, _)| *r == root) || !root.is_dir() {
+                continue;
+            }
+            let lsp = Arc::downgrade(&self.lsp);
+            let on_change = Box::new(move |batch: &ide_vfs::FsBatch| {
+                if let Some(lsp) = lsp.upgrade() {
+                    lsp.watched_files_changed(&batch.created, &batch.modified, &batch.removed, &batch.excluded_dirs);
+                }
+            });
+            // Not project files: nothing else hears of them.
+            match Watcher::start(&root, Vec::new(), Arc::new(ide_core::NullSink), on_change) {
+                Ok(w) => watchers.push((root, w)),
+                Err(e) => tracing::warn!("language server watcher {}: {e}", root.display()),
+            }
+        }
+    }
+}
+
+#[allow(clippy::too_many_arguments)]
 fn content_root_watcher(
    dir: &Path,
    excludes: &[String],
@@ -998,21 +1120,28 @@ fn content_root_watcher(
    index: &Arc<ProjectIndex>,
    documents: &Arc<Documents>,
    history: &Arc<LocalHistory>,
+    lsp: &Arc<LspManager>,
    kotlin_bridge: Option<&Arc<crate::kotlin_bridge::KotlinBridge>>,
 ) -> Option<Watcher> {
    let kotlin_bridge = kotlin_bridge.cloned();
-    let (index, documents, history) = (index.clone(), documents.clone(), history.clone());
+    let (index, documents, history, lsp) = (index.clone(), documents.clone(), history.clone(), lsp.clone());
+    let root = dir.to_path_buf();
    Watcher::start(
        dir,
        excludes.to_vec(),
        sink.clone(),
        Box::new(move |batch| {
            let changed: Vec<PathBuf> = batch.created.iter().chain(&batch.modified).cloned().collect();
-            index.update(&changed, &batch.removed);
+            let (ignored, ignored_gone) = ignored_changes(batch);
+            index.update(&[&changed[..], &ignored].concat(), &[&batch.removed[..], &ignored_gone].concat());
+            // A workspace member's PHP language level follows its own composer.json.
+            if composer_changed(&root, changed.iter().chain(&batch.removed)) {
+                lsp.reconfigure_soon();
+            }
            if let Some(bridge) = &kotlin_bridge {
                bridge.files_changed(changed.iter().chain(&batch.removed));
            }
-            documents.on_disk_changed(&changed);
+            documents.on_disk_changed(&[&changed[..], &ignored].concat());
            record_external_changes(&history, &changed, &batch.removed);
        }),
    )
@@ -1020,6 +1149,13 @@ fn content_root_watcher(
    .ok()
 }

+/// Whether the `composer.json` of `root` is among `paths`: the PHP language level follows it
+/// (`ide_sdk::php`).
+fn composer_changed<'a>(root: &Path, mut paths: impl Iterator<Item = &'a PathBuf>) -> bool {
+    let composer = root.join("composer.json");
+    paths.any(|p| *p == composer)
+}
+
 /// Where agent tasks create their worktrees: next to the project, `<parent>/<name>.worktrees`,
 /// so they sit on the project's drive and outside its tree (not indexed, watched or shown in
 /// its git status); `fallback` for a project at a filesystem root.
@@ -1436,3 +1572,21 @@ mod agent_worktree_tests {
        assert_eq!(agent_worktrees_dir(Path::new("/"), fallback), fallback());
    }
 }
+
+#[cfg(test)]
+mod composer_tests {
+    use super::composer_changed;
+    use std::path::{Path, PathBuf};
+
+    #[test]
+    fn only_the_roots_own_composer_json_counts() {
+        let root = Path::new("/work/app");
+        let changed = |paths: &[&str]| {
+            let paths: Vec<PathBuf> = paths.iter().map(|p| root.join(p)).collect();
+            composer_changed(root, paths.iter())
+        };
+        assert!(changed(&["src/a.php", "composer.json"]));
+        assert!(!changed(&["composer.lock", "vendor/acme/lib/composer.json", "packages/b/composer.json"]));
+        assert!(!changed(&[]));
+    }
+}
@@ -1,6 +1,7 @@
 //! System Settings › HTTP Proxy on the host: the global settings made current for
 //! connections and child processes, the password kept in the saved passwords
-//! (owner-only `proxy-password.json`) instead of `settings.toml`.
+//! (the OS credential store) instead of `settings.toml`, or for the session
+//! when there is no credential store.

 use crate::Host;
 use ide_core::IdeResult;
@@ -12,7 +13,9 @@ impl Host {
    /// `settings` with the saved proxy password filled in, as the Settings dialog edits it.
    pub fn with_proxy_password(&self, mut settings: Settings) -> Settings {
        // A password typed into settings.toml by hand counts too, unless one was saved.
-        if let Some(password) = self.proxy_password.get(PASSWORD_KEY) {
+        let session = || self.proxy_session_password.lock().clone();
+        // The session copy is the latest write that could not be saved.
+        if let Some(password) = session().or_else(|| self.proxy_password.get(PASSWORD_KEY)) {
            settings.proxy.password = password;
        }
        settings
@@ -40,11 +43,70 @@ impl Host {
            _ => return Ok(Some(value)),
        };
        if let Some(password) = password {
-            match password.as_str().filter(|p| !p.is_empty()) {
-                Some(p) => self.proxy_password.set(PASSWORD_KEY, p)?,
+            let password = password.as_str().filter(|p| !p.is_empty());
+            let mut session = self.proxy_session_password.lock();
+            *session = None;
+            match password {
+                Some(p) => {
+                    if let Err(e) = self.proxy_password.set(PASSWORD_KEY, p) {
+                        tracing::warn!("the HTTP proxy password is kept for this session only: {}", e.message);
+                        *session = Some(p.to_owned());
+                    }
+                }
                None => self.proxy_password.delete(PASSWORD_KEY),
            }
        }
        Ok((key != "proxy.password").then_some(value))
    }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use ide_ssh::secrets::{SecretFile, StoreError, StoreResult, Vault};
+    use std::sync::Arc;
+
+    /// A machine without a credential store (a headless Linux host).
+    struct NoStore;
+
+    impl Vault for NoStore {
+        fn available(&self) -> bool {
+            false
+        }
+        fn get(&self, _: &str, _: &str) -> StoreResult<String> {
+            Err(StoreError::NoDefaultStore)
+        }
+        fn set(&self, _: &str, _: &str, _: &str) -> StoreResult<()> {
+            Err(StoreError::NoDefaultStore)
+        }
+        fn delete(&self, _: &str, _: &str) -> StoreResult<()> {
+            Err(StoreError::NoDefaultStore)
+        }
+    }
+
+    #[tokio::test]
+    async fn without_a_credential_store_the_password_lasts_the_session() {
+        let tmp = tempfile::tempdir().unwrap();
+        let mut host = Host::new(crate::HostConfig {
+            config_dir: tmp.path().join("config"),
+            data_dir: tmp.path().join("data"),
+            local_data_dir: tmp.path().join("data"),
+            languages: Arc::new(ide_language::LanguageRegistry::load(None).unwrap()),
+            syntax: Arc::default(),
+            sink_for: Box::new(|_| Arc::new(ide_core::NullSink)),
+            owner: |w| w,
+            runtime: tokio::runtime::Handle::current(),
+            project_environment: false,
+        });
+        let path = tmp.path().join("data/proxy-password.json");
+        std::fs::create_dir_all(path.parent().unwrap()).unwrap();
+        std::fs::write(&path, r#"{"httpProxy": "old"}"#).unwrap();
+        host.proxy_password = SecretFile::with_vault(path, |v| serde_json::from_value(v).ok(), Arc::new(NoStore));
+
+        let left = host.take_proxy_password("proxy.password", serde_json::json!("s3cret")).unwrap();
+        assert_eq!(left, None);
+        assert_eq!(host.with_proxy_password(Settings::default()).proxy.password, "s3cret");
+        host.take_proxy_password("proxy.password", serde_json::json!("")).unwrap();
+        assert_eq!(host.with_proxy_password(Settings::default()).proxy.password, "");
+    }
+}
@@ -188,7 +188,7 @@ impl Dispatcher {
            ops::fs::create_file_bytes(&c.host, c.arg("path")?, c.arg("data")?).await
        })
        .add("fs_create_dir", |c| async move { ide_vfs::create_dir(&c.arg::<PathBuf>("path")?) })
-        .add("fs_rename", |c| async move { ide_vfs::rename(&c.arg::<PathBuf>("from")?, &c.arg::<PathBuf>("to")?) })
+        .add("fs_rename", |c| async move { ops::fs::rename(&c.host, c.arg("from")?, c.arg("to")?).await })
        .add("fs_set_writable", |c| async move {
            ops::fs::set_writable(&c.host, &c.window, c.arg("path")?, c.arg("writable")?)
        })
@@ -222,10 +222,12 @@ pub fn restricted_command_allowed(cmd: &str) -> bool {
            | "project_current"
            | "project_roots"
            | "index_status"
+            | "index_file_extensions"
            | "jvm_file_presentations"
            | "deploy_coverage"
            | "deploy_test_connection"
            | "find_files"
+            | "find_dirs"
            | "find_symbols"
            | "mark_recent"
            | "remove_recent"
@@ -274,6 +276,15 @@ pub fn restricted_command_allowed(cmd: &str) -> bool {
            | "plugin_set_theme_frame"
            | "plugin_catalog"
            | "plugin_assets"
+            | "plugin_market"
+            | "plugin_market_url"
+            | "plugin_set_market_url"
+            | "plugin_market_download"
+            | "plugin_unpack_package"
+            | "plugin_stage_package"
+            | "plugin_preview_install"
+            | "plugin_read_intellij_theme"
+            | "plugin_installed_intellij_themes"
            | "notebook_open"
            | "notebook_get"
            | "notebook_edit"
@@ -295,7 +306,16 @@ pub fn restricted_command_allowed(cmd: &str) -> bool {
            | "vcs_line_hunks"
            | "vcs_file_at"
            | "vcs_blame"
+            | "vcs_block_history"
            | "vcs_log"
+            | "vcs_log_refs"
+            | "vcs_log_users"
+            | "vcs_log_details"
+            | "vcs_log_details_batch"
+            | "vcs_log_index"
+            | "vcs_revision_children"
+            | "vcs_revision_files"
+            | "vcs_open_external_log"
            | "vcs_commit_files"
            | "vcs_commits_changes"
            | "vcs_branches"
@@ -319,12 +339,31 @@ pub fn restricted_command_allowed(cmd: &str) -> bool {
    ) || cmd.starts_with("plugin:")
 }

+/// Commands that change which plugin code runs: allowed where no project is open (the
+/// welcome screen), otherwise only in a trusted project.
+pub fn projectless_command_allowed(cmd: &str) -> bool {
+    matches!(
+        cmd,
+        "plugin_install_dir"
+            | "plugin_uninstall"
+            | "plugin_set_enabled"
+            | "plugin_grant"
+            | "plugin_set_capability"
+            | "plugin_roll_back"
+            | "plugin_reload"
+    )
+}
+
 impl crate::Host {
    pub fn authorize_command(&self, window: &str, command: &str) -> IdeResult<()> {
        if restricted_command_allowed(command) {
            return Ok(());
        }
-        self.project(window)?.require_trust()
+        match self.project(window) {
+            Ok(project) => project.require_trust(),
+            Err(_) if projectless_command_allowed(command) => Ok(()),
+            Err(error) => Err(error),
+        }
    }
 }

@@ -5,6 +5,7 @@
 use ide_core::NullSink;
 use ide_host::{Host, HostConfig, ops};
 use std::sync::Arc;
+use std::time::{Duration, Instant};

 fn options(root: &std::path::Path) -> ide_terminal::TerminalOptions {
    ide_terminal::TerminalOptions {
@@ -52,3 +53,53 @@ fn closing_a_project_closes_its_terminals_and_keeps_other_windows() {
        host.terminals.kill_key("other");
    });
 }
+
+/// The desktop closes a project on the event-loop thread while runtime workers may be
+/// blocked waiting for that thread (IPC responses, window queries): closing must not
+/// wait for workers that need the runtime, and exit still waits for them once free.
+#[test]
+fn detached_close_returns_while_runtime_workers_wait_for_the_closing_thread() {
+    let tmp = tempfile::tempdir().unwrap();
+    let root = dunce::canonicalize(tmp.path()).unwrap().join("project");
+    std::fs::create_dir_all(&root).unwrap();
+    let runtime = tokio::runtime::Builder::new_multi_thread().worker_threads(1).enable_all().build().unwrap();
+    let _guard = runtime.enter();
+    let host = Arc::new(Host::new(HostConfig {
+        config_dir: tmp.path().join("config"),
+        data_dir: tmp.path().join("data"),
+        local_data_dir: tmp.path().join("data"),
+        languages: Arc::new(ide_language::LanguageRegistry::load(None).unwrap()),
+        syntax: Arc::default(),
+        sink_for: Box::new(|_| Arc::new(NullSink)),
+        owner: |w| w,
+        runtime: runtime.handle().clone(),
+        project_environment: false,
+    }));
+    host.trust.decide(&root, true, false).unwrap();
+    host.open_project("main", &root).unwrap();
+
+    // Occupy the only runtime worker until "the event loop" answers.
+    let (started_tx, started_rx) = std::sync::mpsc::channel();
+    let (release_tx, release_rx) = std::sync::mpsc::channel::<()>();
+    runtime.spawn(async move {
+        started_tx.send(()).unwrap();
+        let _ = release_rx.recv();
+    });
+    started_rx.recv().unwrap();
+
+    let (closed_tx, closed_rx) = std::sync::mpsc::channel();
+    let closer = host.clone();
+    std::thread::spawn(move || {
+        closer.close_project_detached("main");
+        let _ = closed_tx.send(());
+    });
+    let returned = closed_rx.recv_timeout(Duration::from_secs(5));
+    release_tx.send(()).unwrap();
+    assert!(returned.is_ok(), "closing waited for a runtime worker that waits for the closing thread");
+    assert!(host.project("main").is_err(), "the window no longer has the project");
+    host.open_project("main", &root).expect("the window opens a project once the close has finished");
+
+    let started = Instant::now();
+    host.shutdown_notebooks_on_exit();
+    assert!(started.elapsed() < Duration::from_secs(5), "exit joined the finished close instead of timing out");
+}
@@ -131,25 +131,44 @@ fn installs_from_before_versioning_keep_working_and_move_on_update() {

 /// `hello` as `acme.hello` at `version`, packed and signed with `key`.
 fn signed_hello(dir: &Path, version: &str, key: &PublisherKey, host: &PluginHost) -> (PathBuf, IndexEntry) {
-    let src = variant(&repo().join("crates/ide-plugin/tests/fixtures/hello"), dir, &format!("src-{version}"), |t| {
-        t.replace("id = \"hello\"", "id = \"acme.hello\"")
-            .replace("version = \"0.3.0\"", &format!("version = \"{version}\""))
-    });
+    signed(dir, "acme", version, key, host, |t| t.to_owned())
+}
+
+/// `hello` as `<publisher>.hello` at `version`, its manifest changed by
+/// `edit`, packed and signed with `key`.
+fn signed(
+    dir: &Path,
+    publisher: &str,
+    version: &str,
+    key: &PublisherKey,
+    host: &PluginHost,
+    edit: impl Fn(&str) -> String,
+) -> (PathBuf, IndexEntry) {
+    let id = format!("{publisher}.hello");
+    let src =
+        variant(&repo().join("crates/ide-plugin/tests/fixtures/hello"), dir, &format!("src-{id}-{version}"), |t| {
+            edit(
+                &t.replace("id = \"hello\"", &format!("id = \"{id}\""))
+                    .replace("version = \"0.3.0\"", &format!("version = \"{version}\"")),
+            )
+        });
    let files = host.package_files_of(&src).unwrap();
    let digest = package::package_digest(&src, &files).unwrap();
-    let sig = key.sign("acme", "acme.hello", version, &digest);
-    let out = dir.join(format!("acme.hello-{version}.oiplugin"));
+    let sig = key.sign(publisher, &id, version, &digest);
+    let out = dir.join(format!("{id}-{version}.oiplugin"));
    package::pack(&src, &files, &out, Some(&sig)).unwrap();
    let entry = IndexEntry {
-        id: "acme.hello".into(),
+        id: id.clone(),
        name: "Hello".into(),
        version: version.into(),
        description: String::new(),
        authors: vec![],
-        publisher: "acme".into(),
+        publisher: publisher.into(),
        download: out.file_name().unwrap().to_string_lossy().into_owned(),
        digest,
        capabilities: vec![],
+        engine: "^1.0".into(),
+        categories: vec!["tools".into()],
    };
    (out, entry)
 }
@@ -166,16 +185,39 @@ fn write_index(
        publishers: vec![Publisher {
            id: "acme".into(),
            name: "ACME".into(),
-            keys: vec![KeyEntry { key: key.public_base64(), revoked: key_revoked }],
+            keys: vec![KeyEntry { revoked: key_revoked, ..KeyEntry::new(key.public_base64()) }],
        }],
        plugins,
        revoked,
+        moved: None,
    };
    let path = dir.join("index.json");
    std::fs::write(&path, serde_json::to_string(&index).unwrap()).unwrap();
    path.to_string_lossy().into_owned()
 }

+/// First run: nothing cached yet, so listing the marketplace reads its index
+/// instead of showing an empty one; later listings use the index read.
+#[test]
+fn the_first_marketplace_listing_reads_the_index() {
+    let f = fixture();
+    assert!(f.host.market_listing(false).unwrap().is_empty(), "no marketplace configured");
+
+    let market = f.work.join("market");
+    std::fs::create_dir_all(&market).unwrap();
+    let key = PublisherKey::from_seed([3; 32]);
+    let (_, entry) = signed_hello(&market, "1.0.0", &key, &f.host);
+    let url = write_index(&market, &key, vec![entry], vec![], false);
+    f.host.set_market_url(Some(url.clone()));
+
+    let listed = f.host.market_listing(false).unwrap();
+    assert_eq!(listed.iter().map(|p| p.entry.id.as_str()).collect::<Vec<_>>(), ["acme.hello"]);
+
+    std::fs::remove_file(&url).unwrap();
+    assert_eq!(f.host.market_listing(false).unwrap().len(), 1, "the index read is kept");
+    assert!(f.host.market_listing(true).is_err(), "refresh reads the index again");
+}
+
 #[test]
 fn signed_marketplace_plugins_install_and_revocations_disable_them() {
    let f = fixture();
@@ -260,3 +302,210 @@ fn package_files_install_from_disk_unsigned() {
    let info = f.host.install_from_dir(&dir, &Consent::all()).unwrap();
    assert_eq!((info.status, info.publisher), (PluginStatus::Inactive, None));
 }
+
+#[test]
+fn the_marketplace_offers_the_newest_version_this_ide_can_load() {
+    let f = fixture();
+    let market = f.work.join("market");
+    std::fs::create_dir_all(&market).unwrap();
+    let key = PublisherKey::from_seed([3; 32]);
+    let (_, old) = signed_hello(&market, "1.0.0", &key, &f.host);
+    let (_, new) = signed_hello(&market, "2.0.0", &key, &f.host);
+    let next_major = ide_extension::ENGINE_VERSION.split('.').next().unwrap().parse::<u64>().unwrap() + 1;
+    let new = IndexEntry { engine: format!("^{next_major}.0"), ..new };
+    f.host.set_market_url(Some(write_index(&market, &key, vec![old.clone(), new.clone()], vec![], false)));
+
+    let listed = f.host.refresh_market().unwrap();
+    assert_eq!((listed.len(), listed[0].entry.version.as_str(), listed[0].compatible), (1, "1.0.0", true));
+    let dir = f.host.download_market_plugin("acme.hello").unwrap();
+    assert_eq!(f.host.preview_install(&dir).unwrap().version, "1.0.0");
+
+    // Only a version for a newer IDE: shown as such, not downloaded.
+    write_index(&market, &key, vec![new], vec![], false);
+    let listed = f.host.refresh_market().unwrap();
+    assert_eq!((listed[0].entry.version.as_str(), listed[0].compatible), ("2.0.0", false));
+    let err = f.host.download_market_plugin("acme.hello").unwrap_err();
+    assert!(err.message.contains("update OpenIDEA"), "{}", err.message);
+}
+
+#[test]
+fn a_moved_marketplace_is_read_where_it_moved_to() {
+    let f = fixture();
+    let market = f.work.join("market");
+    std::fs::create_dir_all(&market).unwrap();
+    let key = PublisherKey::from_seed([3; 32]);
+    let (_, entry) = signed_hello(&market, "1.0.0", &key, &f.host);
+    write_index(&market, &key, vec![entry], vec![], false);
+    // The old address points at the new one; downloads resolve against where the index is.
+    let old = f.work.join("old");
+    std::fs::create_dir_all(&old).unwrap();
+    std::fs::write(old.join("index.json"), r#"{"format": 1, "moved": "../market/index.json"}"#).unwrap();
+    f.host.set_market_url(Some(old.join("index.json").to_string_lossy().into_owned()));
+
+    let listed = f.host.refresh_market().unwrap();
+    assert_eq!(listed[0].entry.id, "acme.hello");
+    let dir = f.host.download_market_plugin("acme.hello").unwrap();
+    assert_eq!(f.host.preview_install(&dir).unwrap().version, "1.0.0");
+
+    // A loop gives up.
+    std::fs::write(old.join("index.json"), r#"{"format": 1, "moved": "index.json"}"#).unwrap();
+    let err = f.host.refresh_market().unwrap_err();
+    assert!(err.message.contains("moved more than"), "{}", err.message);
+}
+
+/// `dir/index.json` listing `publishers` and `plugins`; its path.
+fn index_of(dir: &Path, publishers: Vec<Publisher>, plugins: Vec<IndexEntry>) -> String {
+    let index = Index { format: package::INDEX_FORMAT, publishers, plugins, ..Index::default() };
+    let path = dir.join("index.json");
+    std::fs::write(&path, serde_json::to_string(&index).unwrap()).unwrap();
+    path.to_string_lossy().into_owned()
+}
+
+fn publisher(id: &str, keys: Vec<KeyEntry>) -> Publisher {
+    Publisher { id: id.into(), name: id.into(), keys }
+}
+
+fn updates_announced(events: &Events) -> Vec<Vec<String>> {
+    events
+        .lock()
+        .iter()
+        .filter_map(|e| match e {
+            PluginEvent::UpdatesAvailable { updates } => {
+                Some(updates.iter().map(|u| format!("{} {}", u.id, u.version)).collect())
+            }
+            _ => None,
+        })
+        .collect()
+}
+
+/// What the install page sends for an update it doesn't need to show: the grants the installed version has.
+fn as_granted(preview: &InstallPreview) -> Consent {
+    let optional = preview.capabilities.iter().filter(|c| c.optional && c.granted).map(|c| c.id.clone()).collect();
+    Consent { optional, signer_change: false }
+}
+
+#[test]
+fn updates_keep_their_signer_and_need_no_consent_when_nothing_is_new() {
+    let f = fixture();
+    let market = f.work.join("market");
+    std::fs::create_dir_all(&market).unwrap();
+    let (k1, k2, k3) =
+        (PublisherKey::from_seed([1; 32]), PublisherKey::from_seed([2; 32]), PublisherKey::from_seed([3; 32]));
+    let same = |t: &str| t.to_owned();
+    let (_, v1) = signed(&market, "acme", "1.0.0", &k1, &f.host, same);
+    f.host.set_market_url(Some(index_of(
+        &market,
+        vec![publisher("acme", vec![KeyEntry::new(k1.public_base64())])],
+        vec![v1.clone()],
+    )));
+    f.host.refresh_market().unwrap();
+    let dir = f.host.download_market_plugin("acme.hello").unwrap();
+    let first = f.host.preview_install(&dir).unwrap();
+    assert!(first.needs_consent && !first.signer_changed, "a first install is confirmed");
+    f.host.install_from_dir(&dir, &Consent::default()).unwrap();
+    assert!(updates_announced(&f.events).is_empty());
+
+    // 1.1.0, same key and needs: announced once, installed with the grants it has.
+    let (_, v11) = signed(&market, "acme", "1.1.0", &k1, &f.host, same);
+    let keys1 = vec![KeyEntry::new(k1.public_base64())];
+    index_of(&market, vec![publisher("acme", keys1.clone())], vec![v1.clone(), v11.clone()]);
+    f.host.refresh_market().unwrap();
+    f.host.refresh_market().unwrap();
+    assert_eq!(updates_announced(&f.events), [["acme.hello 1.1.0"]], "once per set of versions");
+    let dir = f.host.download_market_plugin("acme.hello").unwrap();
+    let preview = f.host.preview_install(&dir).unwrap();
+    assert_eq!(preview.replaces.as_deref(), Some("1.0.0"));
+    assert!(!preview.needs_consent && !preview.signer_changed);
+    assert!(preview.capabilities.iter().all(|c| c.granted), "shows what the installed version was granted");
+    f.host.install_from_dir(&dir, &as_granted(&preview)).unwrap();
+    assert!(f.host.market_plugins().iter().all(|p| !p.is_update()));
+
+    // 1.2.0 asks for something new: the user is asked.
+    let (_, v12) = signed(&market, "acme", "1.2.0", &k1, &f.host, |t| {
+        t.replace(
+            "required = [\"editor.read\", \"editor.write\"]",
+            "required = [\"editor.read\", \"editor.write\"]\noptional = [\"net:example.com\"]",
+        )
+    });
+    index_of(&market, vec![publisher("acme", keys1.clone())], vec![v12.clone()]);
+    f.host.refresh_market().unwrap();
+    let dir = f.host.download_market_plugin("acme.hello").unwrap();
+    let preview = f.host.preview_install(&dir).unwrap();
+    assert!(preview.needs_consent && !preview.signer_changed);
+    f.host.install_from_dir(&dir, &Consent::default()).unwrap();
+
+    // 1.3.0 signed with a key the installed one didn't endorse: another signer, the user's call.
+    let (_, v13) = signed(&market, "acme", "1.3.0", &k2, &f.host, same);
+    let keys12 = vec![KeyEntry::new(k1.public_base64()), KeyEntry::new(k2.public_base64())];
+    index_of(&market, vec![publisher("acme", keys12)], vec![v13]);
+    f.host.refresh_market().unwrap();
+    let dir = f.host.download_market_plugin("acme.hello").unwrap();
+    let preview = f.host.preview_install(&dir).unwrap();
+    assert!(preview.signer_changed && preview.needs_consent);
+    let err = f.host.install_from_dir(&dir, &as_granted(&preview)).unwrap_err();
+    assert!(err.message.contains("another key"), "{}", err.message);
+    assert_eq!(f.host.info_of("acme.hello").unwrap().version, "1.2.0", "nothing changed");
+    f.host.install_from_dir(&dir, &Consent { signer_change: true, ..as_granted(&preview) }).unwrap();
+
+    // 1.4.0 signed with k3, which k2 endorsed: a rotation the installed signer vouched for.
+    let (_, v14) = signed(&market, "acme", "1.4.0", &k3, &f.host, same);
+    let keys = vec![
+        KeyEntry { endorsement: Some(k2.endorse("acme", &k3.public_base64())), ..KeyEntry::new(k3.public_base64()) },
+        KeyEntry::new(k2.public_base64()),
+    ];
+    index_of(&market, vec![publisher("acme", keys)], vec![v14]);
+    f.host.refresh_market().unwrap();
+    let dir = f.host.download_market_plugin("acme.hello").unwrap();
+    let preview = f.host.preview_install(&dir).unwrap();
+    assert!(!preview.signer_changed && !preview.needs_consent);
+    f.host.install_from_dir(&dir, &as_granted(&preview)).unwrap();
+    assert_eq!(f.host.info_of("acme.hello").unwrap().version, "1.4.0");
+}
+
+#[test]
+fn an_index_in_a_newer_format_still_revokes() {
+    let f = fixture();
+    let market = f.work.join("market");
+    std::fs::create_dir_all(&market).unwrap();
+    let key = PublisherKey::from_seed([3; 32]);
+    let (_, entry) = signed_hello(&market, "1.0.0", &key, &f.host);
+    f.host.set_market_url(Some(write_index(&market, &key, vec![entry], vec![], false)));
+    f.host.refresh_market().unwrap();
+    let dir = f.host.download_market_plugin("acme.hello").unwrap();
+    f.host.install_from_dir(&dir, &Consent::all()).unwrap();
+
+    let newer = format!(
+        r#"{{"format": {}, "plugins": "a shape this IDE can't read",
+            "revoked": [{{"id": "acme.hello", "reason": "steals tokens"}}]}}"#,
+        package::INDEX_FORMAT + 1
+    );
+    std::fs::write(market.join("index.json"), newer).unwrap();
+    let err = f.host.refresh_market().unwrap_err();
+    assert!(err.message.contains("newer OpenIDEA"), "{}", err.message);
+    let info = f.host.info_of("acme.hello").unwrap();
+    assert_eq!((info.status, info.error.as_deref()), (PluginStatus::Failed, Some("revoked: steals tokens")));
+    assert!(f.host.market_plugins().is_empty());
+}
+
+#[test]
+fn official_plugins_need_the_key_this_ide_was_built_with() {
+    let f = fixture();
+    let market = f.work.join("market");
+    std::fs::create_dir_all(&market).unwrap();
+    let (root, intruder) = (PublisherKey::from_seed([1; 32]), PublisherKey::from_seed([6; 32]));
+    f.host.set_official_keys(vec![root.public_base64()]);
+    // The index lists the intruder's key for the official publisher.
+    let (_, forged) = signed(&market, OFFICIAL_PUBLISHER, "1.0.0", &intruder, &f.host, |t| t.to_owned());
+    let keys = vec![KeyEntry::new(intruder.public_base64())];
+    f.host.set_market_url(Some(index_of(&market, vec![publisher(OFFICIAL_PUBLISHER, keys.clone())], vec![forged])));
+    f.host.refresh_market().unwrap();
+    let err = f.host.download_market_plugin("openidea.hello").unwrap_err();
+    assert!(err.message.contains("trusted publisher"), "{}", err.message);
+
+    // Signed with the built-in key it installs, whatever keys the index lists.
+    let (_, genuine) = signed(&market, OFFICIAL_PUBLISHER, "1.0.1", &root, &f.host, |t| t.to_owned());
+    index_of(&market, vec![publisher(OFFICIAL_PUBLISHER, keys)], vec![genuine]);
+    f.host.refresh_market().unwrap();
+    let dir = f.host.download_market_plugin("openidea.hello").unwrap();
+    assert_eq!(f.host.preview_install(&dir).unwrap().publisher.as_deref(), Some(OFFICIAL_PUBLISHER));
+}
@@ -0,0 +1,115 @@
+//! Explicit external logs allow history reads without adding a writable project root.
+use ide_core::NullSink;
+use ide_host::{Host, HostConfig, ops::vcs};
+use std::{path::Path, process::Command, sync::Arc};
+
+fn git(root: &Path, args: &[&str]) -> String {
+    let output = Command::new("git")
+        .current_dir(root)
+        .args(["-c", "user.name=Test", "-c", "[email protected]", "-c", "commit.gpgsign=false"])
+        .args(args)
+        .output()
+        .unwrap();
+    assert!(output.status.success(), "{}", String::from_utf8_lossy(&output.stderr));
+    String::from_utf8(output.stdout).unwrap().trim().to_owned()
+}
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn external_history_is_readable_and_never_becomes_a_write_target() {
+    let temp = tempfile::tempdir().unwrap();
+    let base = dunce::canonicalize(temp.path()).unwrap();
+    let root = base.join("project");
+    let external = base.join("external");
+    std::fs::create_dir_all(&root).unwrap();
+    std::fs::create_dir_all(&external).unwrap();
+    git(&external, &["init", "-b", "main"]);
+    let deleted = external.join("deleted.txt");
+    std::fs::write(&deleted, "historical content\n").unwrap();
+    git(&external, &["add", "."]);
+    git(&external, &["commit", "-m", "initial"]);
+    let first = git(&external, &["rev-parse", "HEAD"]);
+    git(&external, &["rm", "deleted.txt"]);
+    git(&external, &["commit", "-m", "delete"]);
+    let head = git(&external, &["rev-parse", "HEAD"]);
+    let host = Host::new(HostConfig {
+        config_dir: base.join("config"),
+        data_dir: base.join("data"),
+        local_data_dir: base.join("data"),
+        languages: Arc::new(ide_language::LanguageRegistry::load(None).unwrap()),
+        syntax: Arc::default(),
+        sink_for: Box::new(|_| Arc::new(NullSink)),
+        owner: |w| w,
+        runtime: tokio::runtime::Handle::current(),
+        project_environment: false,
+    });
+    // A standalone editor needs no project, indexer, or writable VCS root.
+    vcs::vcs_open_external_log(&host, "standalone", external.clone()).await.unwrap();
+    let standalone = vcs::vcs_log(&host, "standalone", Some(external.clone()), Default::default()).await.unwrap();
+    assert_eq!(standalone[0].id, head);
+    let details = vcs::vcs_log_details_batch(
+        &host,
+        "standalone",
+        Some(external.clone()),
+        vec![head.clone(), first.clone()],
+        ide_core::RequestId(987),
+    )
+    .await
+    .unwrap();
+    assert!(details.iter().all(|d| d.signature == "N"));
+    assert_eq!(
+        vcs::vcs_revision_children(&host, "standalone", Some(external.clone()), first.clone(), String::new())
+            .await
+            .unwrap(),
+        vec!["deleted.txt"]
+    );
+    assert!(host.project("standalone").is_err());
+    host.trust.decide(&external, false, false).unwrap();
+    let restricted = host.open_project("restricted", &external).unwrap();
+    assert!(!restricted.is_trusted());
+    vcs::vcs_open_external_log(&host, "restricted", external.clone()).await.unwrap();
+    let restricted_log = vcs::vcs_log(
+        &host,
+        "restricted",
+        Some(external.clone()),
+        ide_vcs::LogQuery { request: Some(ide_core::RequestId(988)), summary_only: true, ..Default::default() },
+    )
+    .await
+    .unwrap();
+    assert_eq!(restricted_log[0].id, head);
+    assert_eq!(
+        vcs::vcs_log_details_batch(
+            &host,
+            "restricted",
+            Some(external.clone()),
+            vec![head.clone()],
+            ide_core::RequestId(989)
+        )
+        .await
+        .unwrap()[0]
+            .signature,
+        "N"
+    );
+    host.close_project("restricted");
+    let payload =
+        serde_json::to_vec(&serde_json::json!({ "repo": external, "revision": first, "path": "deleted.txt" })).unwrap();
+    let hex = payload.iter().map(|b| format!("{b:02x}")).collect::<String>();
+    let document =
+        vcs::revision_virtual_document(&host, "standalone", &format!("git-revision:{hex}/deleted.txt")).await.unwrap();
+    assert_eq!(document.text, "historical content\n");
+    host.trust.decide(&root, true, false).unwrap();
+    let project = host.open_project("main", &root).unwrap();
+    assert!(vcs::vcs_log(&host, "main", Some(external.clone()), Default::default()).await.is_err());
+    vcs::vcs_open_external_log(&host, "main", external.clone()).await.unwrap();
+    let log = vcs::vcs_log(&host, "main", Some(external.clone()), Default::default()).await.unwrap();
+    assert_eq!(log.iter().map(|c| c.id.as_str()).collect::<Vec<_>>(), vec![head.as_str(), first.as_str()]);
+    assert_eq!(
+        vcs::vcs_file_at(&host, "main", deleted.clone(), Some(first.clone())).await.unwrap().as_deref(),
+        Some("historical content\n")
+    );
+    assert!(project.repos().at_root(&external).is_none());
+    assert!(vcs::vcs_checkout(&host, "main", Some(external.clone()), first.clone(), false, None).await.is_err());
+    assert!(vcs::vcs_apply_patch(&host, "main", Some(external.clone()), String::new()).await.is_err());
+    assert_eq!(git(&external, &["rev-parse", "HEAD"]), head);
+    assert!(!deleted.exists());
+    host.close_project("main");
+}
@@ -0,0 +1,994 @@
+//! Language smoke tests: the everyday code intelligence of each language — completion, go to
+//! definition, Find Usages, hover, diagnostics with a quick fix, an intention, rename,
+//! formatting, parameter info, the Structure view, auto-import, Optimize Imports and moving a
+//! file — on its `fixtures/` project, through the `ops` the app's commands call and the
+//! language server the app starts by default.
+//!
+//! `#[ignore]`d because they need the servers installed. CI's `Language smoke` job installs
+//! pinned versions and runs one language per job:
+//! `cargo test -p ide-host --test language_smoke -- --ignored --exact <language>`.
+
+use ide_core::{ChangeSet, DocId, IdeEvent, Pos, Range, RequestId, TextChange};
+use ide_host::{Host, HostConfig, ops};
+use ide_lsp::types::{FormatOptions, GotoKind};
+use std::collections::BTreeSet;
+use std::future::Future;
+use std::path::{Path, PathBuf};
+use std::sync::{Arc, Mutex};
+use std::time::{Duration, Instant};
+
+const WINDOW: &str = "main";
+
+/// `word` on the first line of `file` that contains `line`.
+#[derive(Clone, Copy, Debug)]
+struct At {
+    file: &'static str,
+    line: &'static str,
+    word: &'static str,
+}
+
+const fn at(file: &'static str, line: &'static str, word: &'static str) -> At {
+    At { file, line, word }
+}
+
+/// A line typed after the first line of `file` containing `after`.
+#[derive(Clone, Copy, Debug)]
+struct Typed {
+    file: &'static str,
+    after: &'static str,
+    text: &'static str,
+}
+
+const fn typed(file: &'static str, after: &'static str, text: &'static str) -> Typed {
+    Typed { file, after, text }
+}
+
+/// One language's checklist. Every check names what it looks for, so a failure says which
+/// operation broke.
+struct Checks {
+    fixture: &'static str,
+    /// Files written into the project copy before it opens.
+    files: &'static [(&'static str, &'static str)],
+    /// How long the first answer may take (project import and indexing).
+    warm_up: Duration,
+    /// Go to definition from the first spot lands on the second.
+    definition: (At, At),
+    /// Find Usages of the symbol lists usages in these files.
+    references: (At, &'static [&'static str]),
+    /// Hover shows this text.
+    hover: (At, &'static str),
+    /// Completion at the end of the typed line offers this item.
+    completion: (Typed, &'static str),
+    /// The typed line is reported with this diagnostic; the quick fix with this title makes the
+    /// file contain the last text.
+    quick_fix: QuickFix,
+    /// With the word selected, this intention is offered with an edit or command.
+    intention: (At, &'static str),
+    /// Formatting turns the typed line into the expected one.
+    format: (Typed, &'static str),
+    indent: Indent,
+    /// Renaming the symbol to the new name edits these files.
+    rename: (At, &'static str, &'static [&'static str]),
+    /// Parameter info in a call being typed: a signature naming this parameter.
+    signature: (Typed, &'static str),
+    /// The Structure view of a file: these symbols, at any depth.
+    outline: (&'static str, &'static [&'static str]),
+    /// Completing a name the file doesn't import yet also imports it.
+    auto_import: AutoImport,
+    /// Optimize Imports, with an import typed after a line.
+    organize_imports: Option<(Typed, Imports)>,
+    /// Moving a file updates its references: (file, new path, a file that then contains this).
+    file_move: Option<(&'static str, &'static str, &'static str, &'static str)>,
+}
+
+#[derive(Clone, Copy, Debug)]
+struct AutoImport {
+    /// The line typed, ending in the start of the name.
+    typed: Typed,
+    /// The completion item.
+    label: &'static str,
+    /// What the item's import adds to the file.
+    result: &'static str,
+}
+
+/// What Optimize Imports does with the typed import.
+#[derive(Clone, Copy, Debug)]
+enum Imports {
+    /// Removes it (unused).
+    Removed,
+    /// Sorts it before this line.
+    Before(&'static str),
+}
+
+#[derive(Clone, Copy, Debug)]
+struct QuickFix {
+    typed: Typed,
+    diagnostic: &'static str,
+    title: &'static str,
+    result: &'static str,
+}
+
+/// The editor's indentation, sent with a format request.
+#[derive(Clone, Copy, Debug)]
+enum Indent {
+    Spaces(u32),
+    Tabs,
+}
+
+type Events = Arc<Mutex<Vec<IdeEvent>>>;
+
+struct Smoke {
+    language: &'static str,
+    host: Arc<Host>,
+    root: PathBuf,
+    events: Events,
+    warm_up: Duration,
+    _tmp: tempfile::TempDir,
+}
+
+fn fixture_dir(name: &str) -> PathBuf {
+    Path::new(env!("CARGO_MANIFEST_DIR")).join("../../fixtures").join(name)
+}
+
+fn copy_dir(from: &Path, to: &Path) {
+    std::fs::create_dir_all(to).unwrap();
+    for entry in std::fs::read_dir(from).unwrap() {
+        let entry = entry.unwrap();
+        let name = entry.file_name();
+        if matches!(name.to_str(), Some("node_modules" | "target" | "build" | ".gradle" | ".venv")) {
+            continue;
+        }
+        let target = to.join(&name);
+        if entry.file_type().unwrap().is_dir() {
+            copy_dir(&entry.path(), &target);
+        } else {
+            std::fs::copy(entry.path(), target).unwrap();
+        }
+    }
+}
+
+fn utf16_len(s: &str) -> u32 {
+    s.encode_utf16().count() as u32
+}
+
+/// The 0-based line index and text of the first line containing `needle`.
+fn find_line<'a>(text: &'a str, needle: &str, what: &str) -> (u32, &'a str) {
+    text.lines()
+        .enumerate()
+        .find(|(_, l)| l.contains(needle))
+        .map(|(i, l)| (i as u32, l))
+        .unwrap_or_else(|| panic!("{what}: no line containing {needle:?}"))
+}
+
+/// The byte offset of `word` in `line`, not as part of a longer identifier (`parse` in `parser::parse`).
+fn find_word(line: &str, word: &str) -> Option<usize> {
+    let ident = |c: char| c.is_alphanumeric() || c == '_';
+    line.match_indices(word).map(|(i, _)| i).find(|&i| {
+        let before = line[..i].chars().next_back();
+        let after = line[i + word.len()..].chars().next();
+        !(word.starts_with(ident) && before.is_some_and(ident)) && !(word.ends_with(ident) && after.is_some_and(ident))
+    })
+}
+
+impl Smoke {
+    async fn start(language: &'static str, checks: &Checks) -> Self {
+        let tmp = tempfile::tempdir().unwrap();
+        let root = dunce::canonicalize(tmp.path()).unwrap().join(checks.fixture);
+        copy_dir(&fixture_dir(checks.fixture), &root);
+        for (path, text) in checks.files {
+            let path = root.join(path);
+            std::fs::create_dir_all(path.parent().unwrap()).unwrap();
+            std::fs::write(path, text).unwrap();
+        }
+        let events: Events = Arc::default();
+        let app = tmp.path().join("app");
+        let host = Arc::new(Host::new(HostConfig {
+            config_dir: app.join("config"),
+            data_dir: app.join("data"),
+            local_data_dir: app.join("data"),
+            languages: Arc::new(ide_language::LanguageRegistry::load(None).unwrap()),
+            syntax: Arc::default(),
+            sink_for: Box::new({
+                let events = events.clone();
+                move |_| {
+                    let events = events.clone();
+                    Arc::new(move |e: IdeEvent| events.lock().unwrap().push(e))
+                }
+            }),
+            owner: |w| w,
+            runtime: tokio::runtime::Handle::current(),
+            project_environment: false,
+        }));
+        host.trust.decide(&root, true, false).unwrap();
+        host.open_project(WINDOW, &root).unwrap();
+        Smoke { language, host, root, events, warm_up: checks.warm_up, _tmp: tmp }
+    }
+
+    fn fail(&self, check: &str, message: impl std::fmt::Display) -> ! {
+        let servers = ops::lsp::lsp_servers(&self.host, WINDOW).unwrap_or_default();
+        let servers: Vec<String> = servers.iter().map(|s| format!("{} ({:?})", s.name, s.status)).collect();
+        panic!("{} — {check}: {message}\nservers: {servers:?}", self.language)
+    }
+
+    /// Retries `f` until it succeeds (servers answer emptily while importing and indexing); on
+    /// timeout, fails with its last answer.
+    async fn retry<T, D: std::fmt::Debug, F: Future<Output = Result<T, D>>>(
+        &self,
+        check: &str,
+        timeout: Duration,
+        mut f: impl FnMut() -> F,
+    ) -> T {
+        let deadline = Instant::now() + timeout;
+        loop {
+            let last = match f().await {
+                Ok(v) => return v,
+                Err(last) => last,
+            };
+            if Instant::now() > deadline {
+                self.fail(check, format_args!("timed out after {timeout:?}; last answer: {last:?}"));
+            }
+            tokio::time::sleep(Duration::from_millis(500)).await;
+        }
+    }
+
+    async fn doc(&self, file: &str) -> (DocId, String) {
+        let info = ops::doc::open(&self.host, WINDOW, self.root.join(file)).await.unwrap();
+        let info = ops::doc::snapshot(&self.host, WINDOW, info.id).await.unwrap();
+        (info.id, info.text)
+    }
+
+    async fn locate(&self, at: At) -> (DocId, Pos) {
+        let (doc, text) = self.doc(at.file).await;
+        let (line, content) = find_line(&text, at.line, at.file);
+        let col = find_word(content, at.word).unwrap_or_else(|| panic!("{at:?}: word not on the line"));
+        (doc, Pos::new(line, utf16_len(&content[..col])))
+    }
+
+    async fn word_range(&self, at: At) -> (DocId, Range) {
+        let (doc, start) = self.locate(at).await;
+        (doc, Range::new(start, Pos::new(start.line, start.col + utf16_len(at.word))))
+    }
+
+    /// Types a new line; returns the position at its end and the text before it.
+    async fn type_line(&self, t: Typed) -> (DocId, Pos, String) {
+        let (doc, text) = self.doc(t.file).await;
+        let (line, content) = find_line(&text, t.after, t.file);
+        let line_start: usize = text.lines().take(line as usize).map(|l| l.len() + 1).sum();
+        let end = utf16_len(&text[..line_start + content.len()]);
+        self.replace(doc, end, end, &format!("\n{}", t.text)).await;
+        let col = utf16_len(t.text);
+        (doc, Pos::new(line + 1, col), text)
+    }
+
+    async fn replace(&self, doc: DocId, from: u32, to: u32, insert: &str) {
+        let version = ops::doc::snapshot(&self.host, WINDOW, doc).await.unwrap().version;
+        let changes = ChangeSet { changes: vec![TextChange { from, to, insert: insert.into() }] };
+        ops::doc::edit(&self.host, WINDOW, doc, version, changes).unwrap();
+    }
+
+    async fn restore(&self, doc: DocId, text: &str) {
+        let current = ops::doc::snapshot(&self.host, WINDOW, doc).await.unwrap().text;
+        self.replace(doc, 0, utf16_len(&current), text).await;
+    }
+
+    fn path(&self, file: &str) -> PathBuf {
+        self.root.join(file)
+    }
+
+    fn files<P: AsRef<Path>>(&self, paths: impl IntoIterator<Item = P>) -> BTreeSet<String> {
+        paths
+            .into_iter()
+            .filter_map(|p| {
+                let p = p.as_ref().strip_prefix(&self.root).ok()?;
+                Some(p.to_string_lossy().replace('\\', "/"))
+            })
+            .collect()
+    }
+
+    async fn definition(&self, from: At, to: At) {
+        let (doc, pos) = self.locate(from).await;
+        let (_, target) = self.locate(to).await;
+        let want = self.path(to.file);
+        self.retry("go to definition", self.warm_up, || async {
+            let found = ops::lsp::lsp_goto(&self.host, WINDOW, doc, pos, GotoKind::Definition).await;
+            match &found {
+                Ok(locs) if locs.iter().any(|l| *l.path == *want && l.range.start.line == target.line) => Ok(()),
+                _ => Err(found),
+            }
+        })
+        .await;
+    }
+
+    async fn references(&self, of: At, files: &[&str]) {
+        let (doc, pos) = self.locate(of).await;
+        let want: BTreeSet<String> = files.iter().map(|f| f.to_string()).collect();
+        self.retry("find usages", self.warm_up, || async {
+            let found = ops::lsp::lsp_references(&self.host, WINDOW, RequestId(1), doc, pos, true, true).await;
+            match &found {
+                Ok(r) if want.is_subset(&self.files(r.locations.iter().map(|l| l.path.clone()))) => Ok(()),
+                _ => Err(found.map(|r| self.files(r.locations.into_iter().map(|l| l.path)))),
+            }
+        })
+        .await;
+    }
+
+    async fn hover(&self, over: At, shows: &str) {
+        let (doc, pos) = self.locate(over).await;
+        self.retry("hover", self.warm_up, || async {
+            let found = ops::lsp::lsp_hover(&self.host, WINDOW, RequestId(2), doc, pos).await;
+            match &found {
+                Ok(Some(h)) if h.contents.value.contains(shows) => Ok(()),
+                _ => Err(found.map(|h| h.map(|h| h.contents.value))),
+            }
+        })
+        .await;
+    }
+
+    async fn completion(&self, line: Typed, offers: &str) {
+        let (doc, pos, before) = self.type_line(line).await;
+        let trigger = line.text.ends_with('.').then(|| ".".to_string());
+        self.retry("completion", self.warm_up, || async {
+            let found = ops::lsp::lsp_completion(&self.host, WINDOW, RequestId(3), doc, pos, trigger.clone()).await;
+            match &found {
+                Ok(list)
+                    if list.items.iter().any(|i| i.label == offers || i.filter_text.as_deref() == Some(offers)) =>
+                {
+                    Ok(())
+                }
+                _ => Err(found.map(|l| l.items.into_iter().take(30).map(|i| i.label).collect::<Vec<_>>())),
+            }
+        })
+        .await;
+        self.restore(doc, &before).await;
+    }
+
+    async fn diagnostic(&self, file: &str, message: &str) -> Range {
+        let path = self.path(file);
+        self.retry("diagnostics", self.warm_up, || async {
+            let events = self.events.lock().unwrap();
+            let latest = events.iter().rev().filter_map(|e| match e {
+                IdeEvent::Diagnostics { path: p, items, source } if **p == *path => Some((source, items)),
+                _ => None,
+            });
+            let mut seen = Vec::new();
+            for (source, items) in latest {
+                if let Some(d) = items.iter().find(|d| d.message.contains(message)) {
+                    return Ok(d.range);
+                }
+                seen.push(format!("{source}: {:?}", items.iter().map(|d| &d.message).collect::<Vec<_>>()));
+            }
+            Err(seen.into_iter().take(4).collect::<Vec<_>>())
+        })
+        .await
+    }
+
+    /// The code actions over `range` (all kinds, as the ⌥⏎ popup asks), the one titled `title`.
+    async fn action(&self, check: &str, doc: DocId, range: Range, title: &str) -> ide_lsp::types::CodeAction {
+        let action = self
+            .retry(check, self.warm_up, || async {
+                let found = ops::lsp::lsp_code_actions(&self.host, WINDOW, doc, range, vec![]).await;
+                match found.as_ref().ok().and_then(|a| a.iter().find(|a| a.title.contains(title))) {
+                    Some(action) => Ok(action.clone()),
+                    None => Err(found.map(|a| a.into_iter().map(|a| a.title).collect::<Vec<_>>())),
+                }
+            })
+            .await;
+        if action.edit.is_some() || action.command.is_some() {
+            return action;
+        }
+        ops::lsp::lsp_resolve_code_action(&self.host, WINDOW, doc, action)
+            .await
+            .unwrap_or_else(|e| self.fail(check, format_args!("resolving {title:?}: {e}")))
+    }
+
+    async fn quick_fix(&self, fix: QuickFix) {
+        let (doc, _, before) = self.type_line(fix.typed).await;
+        assert!(!before.contains(fix.result), "{fix:?}: the file already contains the result");
+        let range = self.diagnostic(fix.typed.file, fix.diagnostic).await;
+        let action = self.action("quick fix", doc, range, fix.title).await;
+        ops::lsp::lsp_execute_code_action(&self.host, WINDOW, RequestId(4), doc, action, vec![])
+            .await
+            .unwrap_or_else(|e| self.fail("quick fix", format_args!("applying {:?}: {e}", fix.title)));
+        self.retry("quick fix", Duration::from_secs(10), || async {
+            let text = self.doc(fix.typed.file).await.1;
+            if text.contains(fix.result) { Ok(()) } else { Err(text) }
+        })
+        .await;
+        self.restore(doc, &before).await;
+    }
+
+    async fn intention(&self, on: At, title: &str) {
+        let (doc, range) = self.word_range(on).await;
+        let action = self.action("intention", doc, range, title).await;
+        let edits = action.edit.as_ref().is_some_and(|e| !e.files.is_empty());
+        if !edits && action.command.is_none() {
+            self.fail("intention", format_args!("{title:?} has neither an edit nor a command: {action:?}"));
+        }
+    }
+
+    async fn format(&self, line: Typed, indent: Indent, formatted: &str) {
+        let (doc, _, before) = self.type_line(line).await;
+        assert!(!before.lines().any(|l| l == formatted), "{line:?}: the file already has {formatted:?}");
+        let (tab_size, insert_spaces) = match indent {
+            Indent::Spaces(n) => (n, true),
+            Indent::Tabs => (4, false),
+        };
+        let options = FormatOptions { tab_size, insert_spaces, on_save: false, tool: None };
+        let text = self
+            .retry("format", self.warm_up, || async {
+                let edits = ops::lsp::lsp_format(&self.host, WINDOW, doc, None, options.clone()).await;
+                let text = self.doc(line.file).await.1;
+                let mut document = ide_text::Document::new(&text);
+                match &edits {
+                    Ok(edits) if !edits.is_empty() && document.apply_edits(edits).is_ok() => Ok(document.text()),
+                    _ => Err(edits),
+                }
+            })
+            .await;
+        if !text.lines().any(|l| l == formatted) {
+            self.fail("format", format_args!("no line {formatted:?} in:\n{text}"));
+        }
+        self.restore(doc, &before).await;
+    }
+
+    async fn rename(&self, symbol: At, to: &str, files: &[&str]) {
+        let (doc, pos) = self.locate(symbol).await;
+        let prepared = ops::lsp::lsp_prepare_rename(&self.host, WINDOW, doc, pos).await;
+        if !matches!(prepared, Ok(Some(_))) {
+            self.fail("rename", format_args!("prepare rename: {prepared:?}"));
+        }
+        let renamed = ops::lsp::lsp_rename(&self.host, WINDOW, RequestId(5), doc, pos, to.into())
+            .await
+            .unwrap_or_else(|e| self.fail("rename", e));
+        let edited = self.files(renamed.edit.files.iter().filter_map(|f| match f {
+            ide_core::FileEdit::Edit { path, .. } => Some(path.clone()),
+            _ => None,
+        }));
+        let want: BTreeSet<String> = files.iter().map(|f| f.to_string()).collect();
+        if !want.is_subset(&edited) {
+            self.fail("rename", format_args!("edits {edited:?}, expected at least {want:?}: {:?}", renamed.edit));
+        }
+        let mut before = Vec::new();
+        for file in files {
+            before.push(self.doc(file).await.1.matches(to).count());
+        }
+        ops::lsp::apply_workspace_edit(&self.host, WINDOW, renamed.edit)
+            .await
+            .unwrap_or_else(|e| self.fail("rename", format_args!("applying the edit: {e}")));
+        for (file, before) in files.iter().zip(before) {
+            if self.doc(file).await.1.matches(to).count() <= before {
+                self.fail("rename", format_args!("{file} has no new {to:?} after the rename"));
+            }
+        }
+    }
+
+    async fn signature(&self, call: Typed, parameter: &str) {
+        let (doc, pos, before) = self.type_line(call).await;
+        self.retry("parameter info", self.warm_up, || async {
+            let found = ops::lsp::lsp_signature_help(&self.host, WINDOW, doc, pos).await;
+            match &found {
+                Ok(Some(h)) if h.signatures.iter().any(|s| s.label.contains(parameter)) => Ok(()),
+                _ => Err(found.map(|h| h.map(|h| h.signatures.into_iter().map(|s| s.label).collect::<Vec<_>>()))),
+            }
+        })
+        .await;
+        self.restore(doc, &before).await;
+    }
+
+    async fn outline(&self, file: &str, symbols: &[&str]) {
+        let (doc, _) = self.doc(file).await;
+        fn names(items: &[ide_core::OutlineItem], out: &mut BTreeSet<String>) {
+            for item in items {
+                out.insert(item.name.clone());
+                names(&item.children, out);
+            }
+        }
+        self.retry("structure", self.warm_up, || async {
+            let found = ops::doc::doc_outline(&self.host, WINDOW, doc).await;
+            let mut shown = BTreeSet::new();
+            if let Ok(items) = &found {
+                names(items, &mut shown);
+            }
+            if symbols.iter().all(|s| shown.contains(*s)) { Ok(()) } else { Err(shown) }
+        })
+        .await;
+    }
+
+    async fn auto_import(&self, a: AutoImport) {
+        let (doc, pos, before) = self.type_line(a.typed).await;
+        assert!(!before.contains(a.result), "{a:?}: the file already contains the result");
+        self.retry("auto-import completion", self.warm_up, || async {
+            let list = ops::lsp::lsp_completion(&self.host, WINDOW, RequestId(6), doc, pos, None).await;
+            let items = match &list {
+                Ok(l) => l.items.iter().filter(|i| i.label == a.label).cloned().collect::<Vec<_>>(),
+                Err(e) => return Err(format!("{e}")),
+            };
+            let text = self.doc(a.typed.file).await.1;
+            let mut imports = Vec::new();
+            for item in items {
+                // Servers compute the import when the item is resolved (on selection).
+                let item = if item.additional_edits.is_empty() {
+                    ops::lsp::lsp_resolve_completion(&self.host, WINDOW, doc, item.clone()).await.unwrap_or(item)
+                } else {
+                    item
+                };
+                let mut document = ide_text::Document::new(&text);
+                if document.apply_edits(&item.additional_edits).is_ok() && document.text().contains(a.result) {
+                    return Ok(());
+                }
+                // Or accepting it runs a server command that edits the file (kotlin-lsp).
+                if let Some(command) = item.command.clone() {
+                    let ran = ops::lsp::lsp_execute_command(&self.host, WINDOW, doc, command).await;
+                    let text = self.doc(a.typed.file).await.1;
+                    if ran.is_ok() && text.contains(a.result) {
+                        return Ok(());
+                    }
+                }
+                imports.push(format!("{:?} {:?}", item.additional_edits, item.command));
+            }
+            let labels: Vec<String> = list.map(|l| l.items.into_iter().take(20).map(|i| i.label).collect()).unwrap();
+            Err(format!("{:?} items' imports: {imports:?}; items: {labels:?}", a.label))
+        })
+        .await;
+        self.restore(doc, &before).await;
+    }
+
+    async fn organize_imports(&self, import: Typed, expect: Imports) {
+        let (doc, _, before) = self.type_line(import).await;
+        let typed = import.text.trim();
+        let organized = |text: &str| match expect {
+            Imports::Removed => !text.lines().any(|l| l.trim() == typed),
+            Imports::Before(line) => {
+                let at = |needle: &str| text.lines().position(|l| l.trim() == needle);
+                matches!((at(typed), at(line)), (Some(a), Some(b)) if a < b)
+            }
+        };
+        self.retry("optimize imports", self.warm_up, || async {
+            let text = self.doc(import.file).await.1;
+            // The whole file, as Optimize Imports asks (positions past the end fail on jdtls).
+            let last = text.split('\n').count() as u32 - 1;
+            let whole = Range::new(Pos::new(0, 0), Pos::new(last, utf16_len(text.rsplit('\n').next().unwrap_or(""))));
+            let kind = "source.organizeImports".to_string();
+            let found = ops::lsp::lsp_code_actions(&self.host, WINDOW, doc, whole, vec![kind.clone()]).await;
+            let actions: Vec<_> = match &found {
+                Ok(a) => a.iter().filter(|a| a.kind.as_ref().is_some_and(|k| k.starts_with(&kind))).cloned().collect(),
+                Err(e) => return Err(format!("{e}")),
+            };
+            let Some(action) = actions.iter().find(|a| a.is_preferred).or(actions.first()).cloned() else {
+                return Err(format!(
+                    "no {kind} action: {:?}",
+                    found.map(|a| a.into_iter().map(|a| a.title).collect::<Vec<_>>())
+                ));
+            };
+            ops::lsp::lsp_apply_code_action(&self.host, WINDOW, doc, action).await.map_err(|e| e.to_string())?;
+            let text = self.doc(import.file).await.1;
+            if organized(&text) { Ok(()) } else { Err(text) }
+        })
+        .await;
+        self.restore(doc, &before).await;
+    }
+
+    async fn file_move(&self, from: &str, to: &str, referencing: &str, result: &str) {
+        // The servers know the referencing file (opened, as in an editor).
+        let _ = self.doc(referencing).await;
+        let moves = vec![ide_workspace::FileMove { from: self.path(from).into(), to: self.path(to).into() }];
+        let edit = self
+            .retry("move file", self.warm_up, || async {
+                let found =
+                    ops::refactor::refactor_file_move_edits(&self.host, WINDOW, RequestId(7), moves.clone()).await;
+                let want = self.path(referencing);
+                match &found {
+                    Ok(e)
+                        if e.edit
+                            .files
+                            .iter()
+                            .any(|f| matches!(f, ide_core::FileEdit::Edit { path, .. } if **path == *want)) =>
+                    {
+                        Ok(e.edit.clone())
+                    }
+                    _ => Err(found),
+                }
+            })
+            .await;
+        ops::refactor::refactor_move_files(&self.host, WINDOW, moves, edit, "Move".into())
+            .await
+            .unwrap_or_else(|e| self.fail("move file", e));
+        if !self.path(to).is_file() {
+            self.fail("move file", format_args!("{to} doesn't exist after the move"));
+        }
+        let text = self.doc(referencing).await.1;
+        if !text.contains(result) {
+            self.fail("move file", format_args!("{referencing} has no {result:?} after the move:\n{text}"));
+        }
+    }
+
+    async fn run(&self, c: &Checks) {
+        self.definition(c.definition.0, c.definition.1).await;
+        self.references(c.references.0, c.references.1).await;
+        self.hover(c.hover.0, c.hover.1).await;
+        self.completion(c.completion.0, c.completion.1).await;
+        self.quick_fix(c.quick_fix).await;
+        self.intention(c.intention.0, c.intention.1).await;
+        self.format(c.format.0, c.indent, c.format.1).await;
+        self.signature(c.signature.0, c.signature.1).await;
+        self.outline(c.outline.0, c.outline.1).await;
+        self.auto_import(c.auto_import).await;
+        if let Some((import, expect)) = c.organize_imports {
+            self.organize_imports(import, expect).await;
+        }
+        self.rename(c.rename.0, c.rename.1, c.rename.2).await;
+        // Last: it moves a file the other checks use.
+        if let Some((from, to, referencing, result)) = c.file_move {
+            self.file_move(from, to, referencing, result).await;
+        }
+        let shutdown = self.host.project(WINDOW).unwrap().lsp.clone();
+        let _ = tokio::time::timeout(Duration::from_secs(20), shutdown.shutdown_all()).await;
+    }
+}
+
+async fn smoke(language: &'static str, checks: Checks) {
+    let smoke = Smoke::start(language, &checks).await;
+    smoke.run(&checks).await;
+}
+
+const TYPESCRIPT: Checks = Checks {
+    fixture: "ts-app",
+    files: &[],
+    warm_up: Duration::from_secs(120),
+    definition: (
+        at("src/index.ts", "Total: ${formatMoney(total)}", "formatMoney"),
+        at("src/money.ts", "export function formatMoney", "formatMoney"),
+    ),
+    references: (at("src/money.ts", "export function formatMoney", "formatMoney"), &["src/index.ts", "src/money.ts"]),
+    hover: (at("src/index.ts", "price: cents(8999)", "cents"), "cents(value: number): Cents"),
+    completion: (typed("src/index.ts", "const total = cart.total();", "  cart."), "applyDiscount"),
+    quick_fix: QuickFix {
+        typed: typed("src/index.ts", "const total = cart.total();", "  console.log(addMoney(total, total));"),
+        diagnostic: "Cannot find name 'addMoney'",
+        title: "import from \"./money.ts\"",
+        result: "import { addMoney, cents, formatMoney } from \"./money.ts\";",
+    },
+    intention: (at("src/index.ts", "const total = cart.total();", "cart.total()"), "Extract to constant"),
+    format: (
+        typed("src/index.ts", "const total = cart.total();", "  const  shown={total,count:cart.count}"),
+        "  const shown = { total, count: cart.count }",
+    ),
+    indent: Indent::Spaces(2),
+    rename: (
+        // From a usage in another file: the declaration is renamed too, not aliased in the import.
+        at("src/index.ts", "Total: ${formatMoney(total)}", "formatMoney"),
+        "formatPrice",
+        &["src/index.ts", "src/money.ts"],
+    ),
+    signature: (typed("src/index.ts", "const total = cart.total();", "  cart.add("), "product"),
+    outline: ("src/cart.ts", &["Cart", "add", "total"]),
+    auto_import: AutoImport {
+        typed: typed("src/index.ts", "const total = cart.total();", "  addMon"),
+        label: "addMoney",
+        result: "addMoney",
+    },
+    organize_imports: Some((
+        typed(
+            "src/index.ts",
+            "import { cents, formatMoney } from \"./money.ts\";",
+            "import { readFileSync } from \"node:fs\";",
+        ),
+        Imports::Removed,
+    )),
+    file_move: Some(("src/money.ts", "src/lib/money.ts", "src/index.ts", "\"./lib/money.ts\"")),
+};
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 4)]
+#[ignore = "language smoke: needs vtsls"]
+async fn typescript() {
+    smoke("typescript", TYPESCRIPT).await;
+}
+
+const PYTHON: Checks = Checks {
+    fixture: "python-app",
+    // Ruff (lint, quick fixes, formatting) starts in projects configured for it.
+    files: &[("ruff.toml", "")],
+    warm_up: Duration::from_secs(120),
+    definition: (
+        at("src/tasks/cli.py", "tasks = TaskList()", "TaskList"),
+        at("src/tasks/models.py", "class TaskList:", "TaskList"),
+    ),
+    references: (
+        at("src/tasks/models.py", "class TaskList:", "TaskList"),
+        &["src/tasks/cli.py", "src/tasks/models.py"],
+    ),
+    hover: (at("src/tasks/cli.py", "tasks.add(\"Write release notes\"", "add"), "def add("),
+    completion: (typed("src/tasks/cli.py", "tasks = build_demo()", "    tasks."), "pending"),
+    quick_fix: QuickFix {
+        typed: typed("src/tasks/cli.py", "tasks = build_demo()", "    print(Task)"),
+        diagnostic: "\"Task\" is not defined",
+        title: "from .models import Task",
+        result: "from .models import Priority, Task, TaskList",
+    },
+    // basedpyright has no refactorings; Ruff's fixes are the Python intentions.
+    intention: (at("src/tasks/models.py", "import os", "os"), "Remove unused import"),
+    format: (
+        typed("src/tasks/cli.py", "tasks = build_demo()", "    shown2 = {'a':1,'b':  2}"),
+        "    shown2 = {\"a\": 1, \"b\": 2}",
+    ),
+    indent: Indent::Spaces(4),
+    rename: (
+        at("src/tasks/models.py", "class TaskList:", "TaskList"),
+        "TaskBoard",
+        &["src/tasks/cli.py", "src/tasks/models.py"],
+    ),
+    signature: (typed("src/tasks/cli.py", "tasks = build_demo()", "    tasks.add("), "title"),
+    outline: ("src/tasks/models.py", &["Priority", "Task", "TaskList", "pending"]),
+    auto_import: AutoImport {
+        typed: typed("src/tasks/cli.py", "tasks = build_demo()", "    stamp = datetim"),
+        label: "datetime",
+        result: "import datetime",
+    },
+    organize_imports: Some((
+        typed("src/tasks/models.py", "from enum import IntEnum", "import abc"),
+        Imports::Before("import os"),
+    )),
+    // basedpyright has no `workspace/willRenameFiles`.
+    file_move: None,
+};
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 4)]
+#[ignore = "language smoke: needs basedpyright and ruff"]
+async fn python() {
+    smoke("python", PYTHON).await;
+}
+
+const RUST: Checks = Checks {
+    fixture: "rust-app",
+    files: &[],
+    warm_up: Duration::from_secs(180),
+    definition: (
+        at("src/main.rs", "match parser::parse(SAMPLE)", "parse"),
+        at("src/parser.rs", "pub fn parse(text: &str)", "parse"),
+    ),
+    references: (at("src/parser.rs", "pub fn parse(text: &str)", "parse"), &["src/main.rs", "src/parser.rs"]),
+    hover: (at("src/main.rs", "inventory.take(&Sku", "take"), "pub fn take("),
+    completion: (typed("src/main.rs", "let mut inventory = Inventory::new();", "    inventory."), "low_stock"),
+    quick_fix: QuickFix {
+        // rust-analyzer's own analysis, pulled as the file changes (no save, no `cargo check`).
+        typed: typed(
+            "src/main.rs",
+            "let mut inventory = Inventory::new();",
+            "    let _blank = parser::ParseError { line: 1 };",
+        ),
+        diagnostic: "missing structure fields",
+        title: "Fill struct fields",
+        result: "ParseError { line: 1, message",
+    },
+    intention: (at("src/main.rs", "match parser::parse(SAMPLE)", "parser::parse(SAMPLE)"), "Extract into variable"),
+    format: (
+        typed("src/main.rs", "let mut inventory = Inventory::new();", "    let  _spaced=( 1,2 );"),
+        "    let _spaced = (1, 2);",
+    ),
+    indent: Indent::Spaces(4),
+    rename: (at("src/parser.rs", "pub fn parse(text: &str)", "parse"), "parse_all", &["src/main.rs", "src/parser.rs"]),
+    signature: (typed("src/main.rs", "let mut inventory = Inventory::new();", "    inventory.take("), "sku"),
+    outline: ("src/lib.rs", &["Inventory", "Item", "take"]),
+    auto_import: AutoImport {
+        typed: typed("src/main.rs", "let mut inventory = Inventory::new();", "    let _seen = HashSe"),
+        label: "HashSet",
+        result: "use std::collections::HashSet;",
+    },
+    // rust-analyzer has no `source.organizeImports`.
+    organize_imports: None,
+    file_move: Some(("src/parser.rs", "src/csv.rs", "src/lib.rs", "pub mod csv;")),
+};
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 4)]
+#[ignore = "language smoke: needs rust-analyzer"]
+async fn rust() {
+    smoke("rust", RUST).await;
+}
+
+const GO: Checks = Checks {
+    fixture: "go-app",
+    files: &[],
+    warm_up: Duration::from_secs(180),
+    definition: (
+        at("cmd/server/main.go", "s := store.New()", "New"),
+        at("internal/store/store.go", "func New() *Store", "New"),
+    ),
+    references: (
+        at("internal/store/store.go", "func New() *Store", "New"),
+        &["cmd/server/main.go", "internal/store/store.go"],
+    ),
+    hover: (
+        at("cmd/server/main.go", "writeJSON(w, s.Search(", "Search"),
+        "func (s *store.Store) Search(q string) []store.Note",
+    ),
+    completion: (typed("cmd/server/main.go", "s := store.New()", "\ts."), "Create"),
+    quick_fix: QuickFix {
+        typed: typed("cmd/server/main.go", "s := store.New()", "\tfmt.Println(s)"),
+        diagnostic: "undefined: fmt",
+        title: "\"fmt\"",
+        result: "\t\"fmt\"",
+    },
+    intention: (at("cmd/server/main.go", "s := store.New()", "store.New()"), "Extract"),
+    format: (typed("cmd/server/main.go", "s := store.New()", "\t_ =  []int{1,2}"), "\t_ = []int{1, 2}"),
+    indent: Indent::Tabs,
+    rename: (
+        at("internal/store/store.go", "func New() *Store", "New"),
+        "Open",
+        &["cmd/server/main.go", "internal/store/store.go"],
+    ),
+    signature: (typed("cmd/server/main.go", "s := store.New()", "\ts.Create("), "title"),
+    outline: ("internal/store/store.go", &["Store", "New", "(*Store).Create"]),
+    auto_import: AutoImport {
+        typed: typed("cmd/server/main.go", "s := store.New()", "\t_ = strings.ToUpp"),
+        label: "ToUpper",
+        result: "\t\"strings\"",
+    },
+    organize_imports: Some((typed("cmd/server/main.go", "\"strconv\"", "\t\"sort\""), Imports::Removed)),
+    // gopls renames packages, not files: moving a Go file changes no references.
+    file_move: None,
+};
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 4)]
+#[ignore = "language smoke: needs gopls"]
+async fn go() {
+    smoke("go", GO).await;
+}
+
+const JAVA: Checks = Checks {
+    fixture: "java-app",
+    files: &[],
+    warm_up: Duration::from_secs(300),
+    definition: (
+        at("src/main/java/com/example/orders/App.java", "book.place(\"alice\", \"Mechanical", "place"),
+        at("src/main/java/com/example/orders/OrderBook.java", "public Order place(", "place"),
+    ),
+    references: (
+        at("src/main/java/com/example/orders/OrderBook.java", "public Order place(", "place"),
+        &["src/main/java/com/example/orders/App.java", "src/test/java/com/example/orders/OrderBookTest.java"],
+    ),
+    hover: (
+        at("src/main/java/com/example/orders/App.java", "long revenue = book.revenueCents()", "revenueCents"),
+        "long com.example.orders.OrderBook.revenueCents()",
+    ),
+    completion: (
+        typed("src/main/java/com/example/orders/App.java", "long revenue = book.revenueCents();", "        book."),
+        "largest",
+    ),
+    quick_fix: QuickFix {
+        typed: typed(
+            "src/main/java/com/example/orders/App.java",
+            "long revenue = book.revenueCents();",
+            "        List<Order> all = book.byCustomer(\"alice\");",
+        ),
+        diagnostic: "List cannot be resolved to a type",
+        title: "Import 'List' (java.util)",
+        result: "import java.util.List;",
+    },
+    intention: (
+        at("src/main/java/com/example/orders/App.java", "long revenue = book.revenueCents();", "book.revenueCents()"),
+        "Extract to local variable",
+    ),
+    format: (
+        typed(
+            "src/main/java/com/example/orders/App.java",
+            "long revenue = book.revenueCents();",
+            "        long  doubled=revenue*2;",
+        ),
+        "        long doubled = revenue * 2;",
+    ),
+    indent: Indent::Spaces(4),
+    rename: (
+        at("src/main/java/com/example/orders/OrderBook.java", "public Order place(", "place"),
+        "submit",
+        &["src/main/java/com/example/orders/App.java", "src/main/java/com/example/orders/OrderBook.java"],
+    ),
+    signature: (
+        typed(
+            "src/main/java/com/example/orders/App.java",
+            "long revenue = book.revenueCents();",
+            "        book.place(",
+        ),
+        "customer",
+    ),
+    outline: (
+        "src/main/java/com/example/orders/OrderBook.java",
+        &["OrderBook", "place(String, String, int, long)", "revenueCents()"],
+    ),
+    auto_import: AutoImport {
+        typed: typed(
+            "src/main/java/com/example/orders/App.java",
+            "long revenue = book.revenueCents();",
+            "        ArrayLis",
+        ),
+        label: "ArrayList",
+        result: "import java.util.ArrayList;",
+    },
+    organize_imports: Some((
+        typed("src/main/java/com/example/orders/OrderBook.java", "import java.util.Optional;", "import java.util.Map;"),
+        Imports::Removed,
+    )),
+    file_move: Some((
+        "src/main/java/com/example/orders/OrderBook.java",
+        "src/main/java/com/example/orders/Ledger.java",
+        "src/main/java/com/example/orders/App.java",
+        "Ledger book",
+    )),
+};
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 4)]
+#[ignore = "language smoke: needs jdtls and JDK 21"]
+async fn java() {
+    smoke("java", JAVA).await;
+}
+
+const KOTLIN: Checks = Checks {
+    fixture: "kotlin-gradle",
+    files: &[],
+    warm_up: Duration::from_secs(420),
+    definition: (
+        at("src/main/kotlin/com/example/library/App.kt", "val library = Library()", "Library"),
+        at("src/main/kotlin/com/example/library/Library.kt", "class Library(", "Library"),
+    ),
+    references: (
+        at("src/main/kotlin/com/example/library/Library.kt", "fun search(query: String)", "search"),
+        &["src/main/kotlin/com/example/library/App.kt", "src/main/kotlin/com/example/library/Library.kt"],
+    ),
+    hover: (
+        at("src/main/kotlin/com/example/library/App.kt", "library.search(\"java\")", "search"),
+        "fun search(query: String): List<Book>",
+    ),
+    completion: (
+        typed("src/main/kotlin/com/example/library/App.kt", "val library = Library()", "    library."),
+        "lend",
+    ),
+    quick_fix: QuickFix {
+        typed: typed(
+            "src/main/kotlin/com/example/library/App.kt",
+            "val library = Library()",
+            "    val stamp = LocalDateTime.now()",
+        ),
+        diagnostic: "Unresolved reference",
+        title: "Import",
+        result: "import java.time.LocalDateTime",
+    },
+    intention: (
+        at("src/main/kotlin/com/example/library/Library.kt", "fun giveBack(isbn: String): Boolean", "giveBack"),
+        "block body",
+    ),
+    format: (
+        typed("src/main/kotlin/com/example/library/App.kt", "val library = Library()", "    val  pair=listOf(1,2)"),
+        "    val pair = listOf(1, 2)",
+    ),
+    indent: Indent::Spaces(4),
+    rename: (
+        at("src/main/kotlin/com/example/library/Library.kt", "fun search(query: String)", "search"),
+        "find",
+        &["src/main/kotlin/com/example/library/App.kt", "src/main/kotlin/com/example/library/Library.kt"],
+    ),
+    signature: (
+        typed("src/main/kotlin/com/example/library/App.kt", "val library = Library()", "    library.lend("),
+        "isbn",
+    ),
+    outline: ("src/main/kotlin/com/example/library/Library.kt", &["Library", "lend", "search"]),
+    auto_import: AutoImport {
+        typed: typed(
+            "src/main/kotlin/com/example/library/App.kt",
+            "val library = Library()",
+            "    val stamp = LocalDateTi",
+        ),
+        label: "LocalDateTime",
+        result: "import java.time.LocalDateTime",
+    },
+    organize_imports: Some((
+        typed("src/main/kotlin/com/example/library/App.kt", "import java.time.LocalDate", "import java.util.UUID"),
+        Imports::Removed,
+    )),
+    // kotlin-lsp has no `workspace/willRenameFiles`.
+    file_move: None,
+};
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 4)]
+#[ignore = "language smoke: needs kotlin-lsp, a JDK and Gradle"]
+async fn kotlin() {
+    smoke("kotlin", KOTLIN).await;
+}
@@ -493,12 +493,15 @@ fn running_calls_can_be_cancelled() {
        let f = f.clone();
        std::thread::spawn(move || f.run("misbehave", "spin", None))
    };
-    std::thread::sleep(Duration::from_millis(100));
-    let started = Instant::now();
-    f.host.cancel("misbehave");
+    // A cancel before the call runs (the instance may still be starting) does nothing: repeat it.
+    let until = Instant::now() + Duration::from_secs(5);
+    while !spinning.is_finished() {
+        assert!(Instant::now() < until, "the running call wasn't interrupted");
+        f.host.cancel("misbehave");
+        std::thread::sleep(Duration::from_millis(20));
+    }
    let err = spinning.join().unwrap().unwrap_err();
    assert!(err.contains("was cancelled"), "{err}");
-    assert!(started.elapsed() < Duration::from_secs(1));
    assert_eq!(f.run("misbehave", "echo", Some("x")).unwrap().as_deref(), Some("x"), "no backoff");
    let stats = f.host.info_of("misbehave").unwrap().stats;
    assert_eq!((stats.crashes, stats.activations), (0, 2));
@@ -540,7 +543,13 @@ fn edit_path_calls_have_soft_and_hard_deadlines() {
    let provider = host.syntax_provider();
    let mis = LanguageId::new("mis");

-    let tokens = provider.highlights(&mis, "fast").unwrap();
+    // The first call starts the instance, which may take longer than the soft deadline.
+    let mut tokens = None;
+    assert!(eventually(|| {
+        tokens = provider.highlights(&mis, "fast");
+        tokens.is_some()
+    }));
+    let tokens = tokens.unwrap();
    assert_eq!((tokens[0].start, tokens[0].end, tokens[0].kind.as_str()), (0, 4, "keyword"));

    // Slower than the soft deadline: dropped (however late this thread gets
@@ -600,8 +609,9 @@ fn providers_of_several_plugins_run_concurrently() {
        text: text.into(),
    };
    let at = ide_core::Pos::new(0, 0);
-    // Activation is not what is measured.
-    assert_eq!(host.provide_completion(&doc("fast"), at, None).len(), 2);
+    // Activation is not what is measured: a first call that starts an instance
+    // can run past the edit-path budget, and its answer is dropped.
+    assert!(eventually(|| host.provide_completion(&doc("fast"), at, None).len() == 2));

    let started = Instant::now();
    let items = host.provide_completion(&doc("sleep:500"), at, None);
@@ -629,7 +639,7 @@ fn idle_instances_are_reclaimed_and_schedules_reactivate() {
    assert_eq!(f.host.instances(), 0);
    let info = f.host.info_of("misbehave").unwrap();
    assert_eq!((info.status, info.stats.reclaims), (PluginStatus::Inactive, 1));
-    assert_eq!(f.command_titles("misbehave").len(), 8, "contributions stay");
+    assert_eq!(f.command_titles("misbehave").len(), 10, "contributions stay");
    assert_eq!(f.run("misbehave", "echo", Some("y")).unwrap().as_deref(), Some("y"));
    assert_eq!(f.host.info_of("misbehave").unwrap().stats.activations, 2);

@@ -1667,22 +1677,21 @@ fn official_ai_completion_cancels_superseded_requests() {
    };
    let at = ide_core::Pos::new(1, 4);
    let host = Arc::new(f);
-    // A slow request, superseded 200 ms later by the next keystroke's.
+    // A slow request, superseded by the next keystroke's once the server has it
+    // (starting the instance comes first, and takes longer on a slow runner).
    let first = ide_core::CancellationToken::new();
    let slow = {
        let (host, doc, first) = (host.clone(), doc.clone(), first.clone());
-        std::thread::spawn(move || {
-            let started = Instant::now();
-            let r = host.host.provide_inline_completion(&doc, at, &first);
-            (r, started.elapsed())
-        })
+        std::thread::spawn(move || (host.host.provide_inline_completion(&doc, at, &first), Instant::now()))
    };
-    std::thread::sleep(Duration::from_millis(200));
+    assert!(eventually(|| seen.lock().len() == 1), "the first request reaches the server");
+    let cancelled = Instant::now();
    first.cancel();
    let started = Instant::now();
    let second = host.host.provide_inline_completion(&doc, at, &ide_core::CancellationToken::new());
    let took = started.elapsed();
-    let (old, old_took) = slow.join().unwrap();
+    let (old, old_done) = slow.join().unwrap();
+    let old_took = old_done.saturating_duration_since(cancelled);
    assert!(old.is_none(), "the superseded request yields nothing");
    assert!(old_took < Duration::from_secs(1), "cancelled, not waited out: {old_took:?}");
    assert_eq!(second.map(|(_, s)| s.insert_text).as_deref(), Some("a + b"));
@@ -1860,7 +1869,12 @@ fn official_mybatis_navigates_between_interface_and_xml() {
    assert_eq!((target.path, target.range.start), (xml_path.clone(), ide_core::Pos::new(1, 14)));

    let xdoc = doc(&xml_path, "xml", xml);
-    let to_java = f.host.provide_definition(&xdoc, ide_core::Pos::new(1, 16));
+    // Reads the interface from disk: on a slow machine that too can run past the budget.
+    let mut to_java = Vec::new();
+    assert!(eventually(|| {
+        to_java = f.host.provide_definition(&xdoc, ide_core::Pos::new(1, 16));
+        !to_java.is_empty()
+    }));
    assert_eq!(
        to_java.iter().map(|l| (l.path.clone(), l.range.start)).collect::<Vec<_>>(),
        [(java_path.clone(), ide_core::Pos::new(3, 9))]
@@ -2031,6 +2045,83 @@ fn pinned_programs_fill_views_and_open_terminals() {
    assert_eq!(args, ["follow", "build", "--lines=5"]);
 }

+#[test]
+fn views_open_project_files_at_a_line() {
+    let f = fixture(Limits::default());
+    let info = f.install(&sample("jobs"));
+    assert_eq!(info.status, PluginStatus::Inactive, "{:?}", info.error);
+    std::fs::write(f.project.join("jobs.log"), "build\ndeploy\nfailed\n").unwrap();
+    let press = |button: &str| {
+        f.take_events();
+        let result = f.host.view_event("jobs", "jobs", ide_plugin::ViewEvent::Button { id: button.into() }, f.inv());
+        let opened = f.take_events().into_iter().find_map(|(client, e)| match e {
+            PluginEvent::OpenLocation { path, line, column, .. } => Some((client, path.0, line, column)),
+            _ => None,
+        });
+        (result, opened)
+    };
+
+    let (result, opened) = press("log");
+    assert!(result.is_ok(), "{result:?}");
+    let (client, path, line, column) = opened.expect("a location");
+    assert_eq!((client.as_deref(), line, column), (Some("main"), 2, 4));
+    assert_eq!(path.canonicalize().unwrap(), f.project.join("jobs.log").canonicalize().unwrap());
+
+    let (result, opened) = press("outside");
+    assert!(result.is_err(), "a path outside the project is refused");
+    assert!(opened.is_none());
+
+    f.host.set_capability("jobs", "project.read", false).unwrap();
+    let (result, opened) = press("log");
+    assert!(result.unwrap_err().message.contains("project.read"), "needs project.read");
+    assert!(opened.is_none());
+}
+
+#[test]
+fn views_can_use_an_svg_icon_from_the_package() {
+    let f = fixture(Limits::default());
+    let tmp = tempfile::tempdir().unwrap();
+    let clean = r##"<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16"><rect width="16" height="16" fill="#08f"/></svg>"##;
+    let package = |dir: &str, icon: &str, svg: &str| {
+        let pkg = tmp.path().join(dir);
+        for (path, text) in [("panel/index.html", "<p>panel</p>"), ("icons/panel.svg", svg)] {
+            std::fs::create_dir_all(pkg.join(path).parent().unwrap()).unwrap();
+            std::fs::write(pkg.join(path), text).unwrap();
+        }
+        std::fs::write(
+            pkg.join("plugin.toml"),
+            format!(
+                r#"id = "panel-icon"
+name = "Panel Icon"
+version = "1.0.0"
+engines.openidea = "^1.0"
+
+[[contributes.views]]
+id = "panel"
+title = "Panel"
+icon = "{icon}"
+location = "bottom"
+web = "panel/index.html"
+"#
+            ),
+        )
+        .unwrap();
+        pkg
+    };
+
+    assert!(f.host.install_from_dir(&package("missing", "icons/missing.svg", clean), &Consent::all()).is_err());
+    let scripted = clean.replace("<rect", "<script>alert(1)</script><rect");
+    assert!(f.host.install_from_dir(&package("scripted", "icons/panel.svg", &scripted), &Consent::all()).is_err());
+
+    let info = f.install(&package("clean", "icons/panel.svg", clean));
+    assert!(info.error.is_none(), "{:?}", info.error);
+    let view = f.host.ui_items("views").into_iter().find(|v| v.key == "panel").expect("the view");
+    assert_eq!(view.decl["icon"].as_str(), Some("icons/panel.svg"));
+    let assets = f.host.assets("panel-icon", "viewIcon/panel").unwrap();
+    assert_eq!(assets.len(), 1);
+    assert!(assets[0].1.contains("<rect"));
+}
+
 /// A plugin with web views and no code: its pages and their files are
 /// installed with it and served only from the declared directories, while
 /// it is enabled and only for the installed version; file icons and
@@ -2404,3 +2495,61 @@ fn uninstalling_deletes_the_plugins_secrets() {
    f.host.uninstall("openidea.ai-completion").unwrap();
    assert!(keychain.0.lock().is_empty(), "{:?}", keychain.0.lock().keys().collect::<Vec<_>>());
 }
+
+/// Plugin API 1.0 leaves room to grow: event kinds are names, and the editor
+/// providers carry snippets, imports, lazily computed quick fixes and tagged
+/// problems.
+#[test]
+fn completion_quick_fixes_problems_and_event_kinds_of_api_1() {
+    let f = fixture(Limits::default());
+    let pkg = f._tmp.path().join("misbehave-providers");
+    copy_dir(&misbehave_pkg(), &pkg);
+    let manifest = std::fs::read_to_string(pkg.join("plugin.toml")).unwrap();
+    std::fs::write(
+        pkg.join("plugin.toml"),
+        format!("{manifest}\n[[contributes.providers]]\nkinds = [\"completion\", \"code-actions\"]\nlanguages = [\"text\"]\n"),
+    )
+    .unwrap();
+    f.install(&pkg);
+    let doc = |text: &str| ide_plugin::ProviderDocument {
+        path: f.project.join("a.txt"),
+        language: "text".into(),
+        version: 1,
+        text: text.into(),
+    };
+    let at = ide_core::Pos::new(0, 0);
+
+    // The first call starts the instance, which may take longer than the edit-path budget.
+    let mut items = Vec::new();
+    assert!(eventually(|| {
+        items = f.host.provide_completion(&doc("rich"), at, None);
+        !items.is_empty()
+    }));
+    let item = &items[0].1;
+    assert_eq!(
+        (item.insert_text.as_str(), item.snippet, item.filter_text.as_deref()),
+        ("f(${1:x})$0", true, Some("fun"))
+    );
+    assert_eq!(item.additional_edits[0].new_text, "use f;\n");
+
+    // Offered without edits; computed when picked.
+    let actions = f.host.provide_code_actions(&doc("lazy"), ide_core::Range::default());
+    let (plugin, action) = actions.into_iter().next().expect("offered");
+    assert!(action.edits.is_empty() && action.data.as_deref() == Some("fix"));
+    let resolved = f.host.resolve_code_action(&plugin, &doc("lazy"), action.clone()).unwrap();
+    assert_eq!(resolved.edits[0].1[0].new_text, "fixed ");
+    let foreign = ide_plugin::CodeAction { data: Some("other".into()), ..action };
+    assert!(f.host.resolve_code_action(&plugin, &doc("lazy"), foreign).is_err());
+
+    // A kind this IDE doesn't know is refused, not a trap.
+    let err = f.host.run_command("misbehave", "subscribe", Some("file-deleted"), f.inv()).unwrap_err();
+    assert!(err.message.contains("no event kind"), "{}", err.message);
+    let err = f.host.run_command("misbehave", "subscribe", Some("file-saved"), f.inv()).unwrap_err();
+    assert!(err.message.contains("events"), "known, but not granted: {}", err.message);
+
+    // Tags the IDE knows, the tool that found it.
+    let path = f.project.join("a.txt");
+    f.host.run_command("misbehave", "diagnose", Some(&path.to_string_lossy()), f.inv()).unwrap();
+    let d = f.workspace.diagnostics.lock().get(&("misbehave".into(), path)).cloned().unwrap();
+    assert_eq!((d[0].unnecessary, d[0].deprecated, d[0].source.as_deref()), (true, false, Some("lint")));
+}
@@ -0,0 +1,285 @@
+//! Opening each `fixtures/` project the way the app does, through the `ops` its commands call:
+//! the source and test roots detected from its build file, the index (files and symbols),
+//! Search Everywhere / Go to Class / Go to Symbol answered from it and kept current as files
+//! come and go, and the Maven / Gradle model.
+//!
+//! The `#[ignore]`d tests run Maven, Gradle, python3 and a JDK 21 (CI's `Language smoke`
+//! java, kotlin and python jobs):
+//! `cargo test -p ide-host --test project_smoke -- --ignored`.
+
+use ide_host::{Host, HostConfig, ops};
+use ide_index::SymbolFilter;
+use ide_workspace::roots::RootKind;
+use std::path::{Path, PathBuf};
+use std::sync::Arc;
+use std::time::{Duration, Instant};
+
+const WINDOW: &str = "main";
+
+struct Fixture {
+    dir: &'static str,
+    /// Detected roots: (project-relative path, kind).
+    roots: &'static [(&'static str, RootKind)],
+    /// Search Everywhere › Files: (query, file found).
+    file: (&'static str, &'static str),
+    /// Go to Class: (name, file declaring it).
+    class: (&'static str, &'static str),
+    /// Go to Symbol: (name, file declaring it).
+    symbol: (&'static str, &'static str),
+    /// A file created while the project is open: (path, text declaring the class `FreshWidget`).
+    added: (&'static str, &'static str),
+}
+
+struct Opened {
+    host: Arc<Host>,
+    root: PathBuf,
+    _tmp: tempfile::TempDir,
+}
+
+fn copy_dir(from: &Path, to: &Path) {
+    std::fs::create_dir_all(to).unwrap();
+    for entry in std::fs::read_dir(from).unwrap().flatten() {
+        let (src, dst) = (entry.path(), to.join(entry.file_name()));
+        if entry.file_type().unwrap().is_dir() {
+            copy_dir(&src, &dst);
+        } else {
+            std::fs::copy(&src, &dst).unwrap();
+        }
+    }
+}
+
+async fn open(fixture: &str) -> Opened {
+    let tmp = tempfile::tempdir().unwrap();
+    let root = dunce::canonicalize(tmp.path()).unwrap().join(fixture);
+    copy_dir(&Path::new(env!("CARGO_MANIFEST_DIR")).join("../../fixtures").join(fixture), &root);
+    let app = tmp.path().join("app");
+    let host = Arc::new(Host::new(HostConfig {
+        config_dir: app.join("config"),
+        data_dir: app.join("data"),
+        local_data_dir: app.join("data"),
+        languages: Arc::new(ide_language::LanguageRegistry::load(None).unwrap()),
+        syntax: Arc::default(),
+        sink_for: Box::new(|_| Arc::new(|_| {})),
+        owner: |w| w,
+        runtime: tokio::runtime::Handle::current(),
+        project_environment: false,
+    }));
+    host.trust.decide(&root, true, false).unwrap();
+    ops::project::open(&host, WINDOW, &root).await.unwrap();
+    Opened { host, root, _tmp: tmp }
+}
+
+/// Polls `check` until it holds; fails with its last answer.
+async fn until<T: std::fmt::Debug>(what: &str, timeout: Duration, mut check: impl FnMut() -> Result<(), T>) {
+    let deadline = Instant::now() + timeout;
+    loop {
+        match check() {
+            Ok(()) => return,
+            Err(last) if Instant::now() > deadline => panic!("{what}: timed out after {timeout:?}; last: {last:?}"),
+            Err(_) => tokio::time::sleep(Duration::from_millis(100)).await,
+        }
+    }
+}
+
+impl Opened {
+    fn files(&self, query: &str) -> Vec<String> {
+        let found = ops::nav::find_files(&self.host, WINDOW, query.into(), 20).unwrap();
+        found.into_iter().map(|f| f.rel_path).collect()
+    }
+
+    fn symbols(&self, query: &str, filter: SymbolFilter) -> Vec<(String, String)> {
+        let found = ops::nav::find_symbols(&self.host, WINDOW, query.into(), filter, 20).unwrap();
+        found.into_iter().map(|s| (s.name, s.rel_path)).collect()
+    }
+
+    fn has_symbol(&self, name: &str, file: &str, filter: SymbolFilter) -> Result<(), Vec<(String, String)>> {
+        let found = self.symbols(name, filter);
+        if found.iter().any(|(n, f)| n == name && f == file) { Ok(()) } else { Err(found) }
+    }
+}
+
+async fn smoke(f: Fixture) {
+    let p = open(f.dir).await;
+    until("indexing", Duration::from_secs(30), || {
+        let s = ops::nav::index_status(&p.host, WINDOW).unwrap();
+        if !s.indexing && s.files > 0 && s.symbols > 0 { Ok(()) } else { Err(s) }
+    })
+    .await;
+
+    let roots = ops::project::roots(&p.host, WINDOW).unwrap().roots;
+    for (path, kind) in f.roots {
+        assert!(
+            roots.iter().any(|r| r.path == *path && r.kind == *kind),
+            "{}: no {kind:?} root {path:?} in {roots:?}",
+            f.dir
+        );
+    }
+
+    let files = p.files(f.file.0);
+    assert!(files.iter().any(|r| r == f.file.1), "{}: files for {:?}: {files:?}", f.dir, f.file.0);
+    if let Err(found) = p.has_symbol(f.class.0, f.class.1, SymbolFilter::Types) {
+        panic!("{}: Go to Class {:?}: {found:?}", f.dir, f.class.0);
+    }
+    if let Err(found) = p.has_symbol(f.symbol.0, f.symbol.1, SymbolFilter::All) {
+        panic!("{}: Go to Symbol {:?}: {found:?}", f.dir, f.symbol.0);
+    }
+
+    // The index follows the file system while the project is open.
+    let (added, text) = f.added;
+    std::fs::write(p.root.join(added), text).unwrap();
+    until("a new file's class", Duration::from_secs(20), || p.has_symbol("FreshWidget", added, SymbolFilter::Types))
+        .await;
+    std::fs::remove_file(p.root.join(added)).unwrap();
+    until("a deleted file's class", Duration::from_secs(20), || {
+        let found = p.symbols("FreshWidget", SymbolFilter::Types);
+        if found.is_empty() { Ok(()) } else { Err(found) }
+    })
+    .await;
+}
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 4)]
+async fn rust_app() {
+    smoke(Fixture {
+        dir: "rust-app",
+        roots: &[("src", RootKind::Source), ("tests", RootKind::Test)],
+        file: ("pars", "src/parser.rs"),
+        class: ("Inventory", "src/lib.rs"),
+        symbol: ("low_stock", "src/lib.rs"),
+        added: ("src/fresh.rs", "pub struct FreshWidget;\n"),
+    })
+    .await;
+}
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 4)]
+async fn ts_app() {
+    smoke(Fixture {
+        dir: "ts-app",
+        roots: &[("src", RootKind::Source), ("tests", RootKind::Test)],
+        file: ("cart", "src/cart.ts"),
+        class: ("Cart", "src/cart.ts"),
+        symbol: ("formatMoney", "src/money.ts"),
+        added: ("src/fresh.ts", "export class FreshWidget {}\n"),
+    })
+    .await;
+}
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 4)]
+async fn python_app() {
+    smoke(Fixture {
+        dir: "python-app",
+        roots: &[("src", RootKind::Source), ("tests", RootKind::Test)],
+        file: ("models", "src/tasks/models.py"),
+        class: ("TaskList", "src/tasks/models.py"),
+        symbol: ("build_demo", "src/tasks/cli.py"),
+        added: ("src/tasks/fresh.py", "class FreshWidget:\n    pass\n"),
+    })
+    .await;
+}
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 4)]
+async fn go_app() {
+    smoke(Fixture {
+        dir: "go-app",
+        roots: &[("", RootKind::Source)],
+        file: ("store", "internal/store/store.go"),
+        class: ("Store", "internal/store/store.go"),
+        symbol: ("writeJSON", "cmd/server/main.go"),
+        added: ("internal/store/fresh.go", "package store\n\ntype FreshWidget struct{}\n"),
+    })
+    .await;
+}
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 4)]
+async fn java_app() {
+    smoke(Fixture {
+        dir: "java-app",
+        roots: &[("src/main/java", RootKind::Source), ("src/test/java", RootKind::Test)],
+        file: ("OrderBook", "src/main/java/com/example/orders/OrderBook.java"),
+        class: ("OrderBook", "src/main/java/com/example/orders/OrderBook.java"),
+        symbol: ("revenueCents", "src/main/java/com/example/orders/OrderBook.java"),
+        added: (
+            "src/main/java/com/example/orders/FreshWidget.java",
+            "package com.example.orders;\n\npublic class FreshWidget {}\n",
+        ),
+    })
+    .await;
+    let p = open("java-app").await;
+    let model = ops::build::build_model(&p.host, WINDOW).await.unwrap();
+    let maven = model.maven.expect("a Maven model");
+    assert_eq!(maven.projects.iter().map(|m| m.artifact_id.as_str()).collect::<Vec<_>>(), ["openidea-fixture-orders"]);
+    assert!(maven.projects[0].dependencies.iter().any(|d| d.artifact_id == "junit-jupiter"), "{maven:?}");
+}
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 4)]
+async fn kotlin_gradle() {
+    smoke(Fixture {
+        dir: "kotlin-gradle",
+        roots: &[("src/main/kotlin", RootKind::Source), ("src/test/kotlin", RootKind::Test)],
+        file: ("Library", "src/main/kotlin/com/example/library/Library.kt"),
+        class: ("Library", "src/main/kotlin/com/example/library/Library.kt"),
+        symbol: ("giveBack", "src/main/kotlin/com/example/library/Library.kt"),
+        added: ("src/main/kotlin/com/example/library/Fresh.kt", "package com.example.library\n\nclass FreshWidget\n"),
+    })
+    .await;
+    let p = open("kotlin-gradle").await;
+    let model = ops::build::build_model(&p.host, WINDOW).await.unwrap();
+    let gradle = model.gradle.expect("a Gradle model");
+    assert_eq!(gradle.projects.iter().map(|g| g.name.as_str()).collect::<Vec<_>>(), ["openidea-fixture-library"]);
+}
+
+/// Maven / Gradle sync (Reload in the build tool window): the build's own model.
+async fn sync(fixture: &str, tool: ide_build::BuildTool) -> ide_build::BuildModel {
+    let p = open(fixture).await;
+    let progress = ops::Channel::new(|_: ide_build::SyncProgress| {});
+    let model =
+        ops::build::build_sync(&p.host, WINDOW, tool, ide_core::RequestId(1), false, vec![], progress).await.unwrap();
+    // The cached sync is what the next open shows.
+    let reloaded = ops::build::build_model(&p.host, WINDOW).await.unwrap();
+    assert_eq!(reloaded, model);
+    model
+}
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 4)]
+#[ignore = "project smoke: needs Maven and a JDK"]
+async fn maven_sync() {
+    let maven = sync("java-app", ide_build::BuildTool::Maven).await.maven.unwrap();
+    assert_eq!(maven.sync_error, None);
+    assert!(maven.synced_at.is_some());
+    let junit = maven.projects[0].dependencies.iter().find(|d| d.artifact_id == "junit-jupiter").unwrap();
+    // The resolved tree, not only the declaration.
+    assert!(!junit.children.is_empty(), "{junit:?}");
+}
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 4)]
+#[ignore = "project smoke: needs Gradle and a JDK"]
+async fn gradle_sync() {
+    let gradle = sync("kotlin-gradle", ide_build::BuildTool::Gradle).await.gradle.unwrap();
+    assert_eq!(gradle.sync_error, None);
+    assert!(gradle.synced_at.is_some());
+    let tasks: Vec<&str> = gradle.projects[0].tasks.iter().map(|t| t.name.as_str()).collect();
+    // The build's own tasks: the application and Kotlin plugins' too.
+    for task in ["run", "compileKotlin", "test"] {
+        assert!(tasks.contains(&task), "no {task} in {tasks:?}");
+    }
+}
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 4)]
+#[ignore = "project smoke: needs python3"]
+async fn python_venv() {
+    let p = open("python-app").await;
+    let made = std::process::Command::new("python3").args(["-m", "venv", ".venv"]).current_dir(&p.root).status();
+    assert!(made.unwrap().success());
+    // The project's virtualenv: listed first, and the interpreter the project uses.
+    let found = ops::sdk::sdk_detect(&p.host, WINDOW, ide_sdk::SdkKind::Python).await.unwrap();
+    assert_eq!(found.first().map(|s| s.source.as_str()), Some("venv"), "{found:?}");
+    let effective = ops::sdk::sdk_python_effective(&p.host, WINDOW).unwrap().expect("an interpreter");
+    assert!(effective.starts_with(p.root.join(".venv")), "{effective:?}");
+}
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 4)]
+#[ignore = "project smoke: needs JDK 21"]
+async fn jdk() {
+    let p = open("java-app").await;
+    let found = ops::sdk::sdk_detect(&p.host, WINDOW, ide_sdk::SdkKind::Jdk).await.unwrap();
+    assert!(found.iter().any(|s| s.version.as_deref().is_some_and(|v| v.starts_with("21"))), "{found:?}");
+}
@@ -43,6 +43,7 @@ fn walk(dir: &std::path::Path) -> Vec<std::path::PathBuf> {

 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn manual_proxy_applies_and_the_password_is_saved_apart() {
+    ide_ssh::secrets::testing::use_memory_store();
    let tmp = tempfile::tempdir().unwrap();
    let host = host(tmp.path());
    assert_eq!(proxy().mode, ProxyMode::Auto);
@@ -61,7 +62,7 @@ async fn manual_proxy_applies_and_the_password_is_saved_apart() {

    assert!(!settings_files(tmp.path()).contains("s3cret"), "no password in settings.toml");
    let saved = std::fs::read_to_string(tmp.path().join("data/proxy-password.json")).unwrap();
-    assert!(saved.contains("s3cret"));
+    assert!(!saved.contains("s3cret"), "the password is in the credential store, not on disk: {saved}");
    assert_eq!(ops::project::settings(&host, "main").proxy.password, "s3cret");

    // A whole-table write keeps the password out of the file too; an empty one forgets it.
@@ -228,7 +228,9 @@ async fn serves_projects_files_documents_search_and_runs() {
    // Real project-host ignore writes travel through the remote command dispatcher.
    assert!(Dispatcher::standard().commands().contains(&"vcs_add_to_ignore"));
    let ignore_root = dunce::canonicalize(&project).unwrap();
-    for (name, destination) in [("shared.tmp", "gitignore"), ("private.tmp", "localExclude")] {
+    // Not `.tmp`: a machine's global excludes file (often `*.tmp`) already
+    // ignores those, so the backend never writes the entry anywhere.
+    for (name, destination) in [("shared.ignore-me", "gitignore"), ("private.ignore-me", "localExclude")] {
        let path = ignore_root.join(name);
        std::fs::write(&path, "temporary").unwrap();
        invoke(&peer, "vcs_add_to_ignore", json!({ "paths": [path], "destination": destination })).await.unwrap();
@@ -237,9 +239,9 @@ async fn serves_projects_files_documents_search_and_runs() {
        assert_eq!(entry["ignored"], true);
        assert_eq!(entry["excluded"], false);
    }
-    assert!(std::fs::read_to_string(project.join(".gitignore")).unwrap().contains("/shared.tmp"));
-    assert!(std::fs::read_to_string(project.join(".git/info/exclude")).unwrap().contains("/private.tmp"));
-    let outside = tmp.path().join("outside.tmp");
+    assert!(std::fs::read_to_string(project.join(".gitignore")).unwrap().contains("/shared.ignore-me"));
+    assert!(std::fs::read_to_string(project.join(".git/info/exclude")).unwrap().contains("/private.ignore-me"));
+    let outside = tmp.path().join("outside.ignore-me");
    std::fs::write(&outside, "keep").unwrap();
    assert!(
        invoke(&peer, "vcs_add_to_ignore", json!({ "paths": [outside], "destination": "gitignore" })).await.is_err()
@@ -141,3 +141,19 @@ async fn workspace_cmake_before_launch_tasks_resolve_in_the_member() {
        assert!(configs.iter().any(|c| c.id == task.target && c.cwd == build.cwd));
    }
 }
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn gradle_init_scripts_are_written_by_the_host_that_runs_the_build() {
+    let tmp = tempfile::tempdir().unwrap();
+    let host = host(tmp.path());
+    let text = "allprojects { }\n".to_string();
+    let path =
+        ops::run::run_gradle_init_script(&host, "main", "openidea-gradle-tests".into(), text.clone()).await.unwrap();
+    assert!(path.contains("openidea-gradle-tests-"), "{path}");
+    assert_eq!(std::fs::read_to_string(&path).unwrap(), text);
+    let again = ops::run::run_gradle_init_script(&host, "main", "openidea-gradle-tests".into(), text).await.unwrap();
+    assert_eq!(again, path);
+    // A name is not a path.
+    let escaped = ops::run::run_gradle_init_script(&host, "main", "../escape".into(), String::new()).await;
+    assert!(escaped.is_err(), "{escaped:?}");
+}
@@ -58,6 +58,11 @@ async fn application_commands_work_in_restricted_projects_and_without_a_project(
        "vcs_write_patch",
        "remote_bootstrap_list",
        "deploy_test_connection",
+        "plugin_market",
+        "plugin_market_url",
+        "plugin_set_market_url",
+        "plugin_market_download",
+        "plugin_preview_install",
    ] {
        assert!(ide_host::trust::restricted_command_allowed(command), "{command}");
        for window in ["main", "welcome"] {
@@ -72,8 +77,6 @@ async fn application_commands_work_in_restricted_projects_and_without_a_project(
        "tools_list",
        "tools_install",
        "tools_uninstall",
-        "plugin_install_dir",
-        "plugin_reload",
        "vcs_git_version",
        "docker_compose_op",
        "db_execute",
@@ -93,6 +96,12 @@ async fn application_commands_work_in_restricted_projects_and_without_a_project(
            assert!(host.authorize_command(window, command).is_err(), "{window}: {command}");
        }
    }
+    // Plugin installs run plugin code: from the welcome screen, but not in an untrusted project.
+    for command in ["plugin_install_dir", "plugin_uninstall", "plugin_set_enabled", "plugin_reload"] {
+        assert!(!ide_host::trust::restricted_command_allowed(command), "{command}");
+        assert!(host.authorize_command("main", command).is_err(), "{command}");
+        assert!(host.authorize_command("welcome", command).is_ok(), "{command}");
+    }
    // These requests validate the vendor before any network access, independently of project trust.
    for window in ["main", "welcome"] {
        let error = ide_host::ops::tools::jdk_download_releases(
@@ -0,0 +1,100 @@
+use ide_core::{NullSink, RequestId};
+use ide_host::{Host, HostConfig, ops};
+use std::{sync::Arc, time::Duration};
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn opens_unity_without_generated_solutions_and_excludes_caches_from_the_index() {
+    let temp = tempfile::tempdir().unwrap();
+    let base = dunce::canonicalize(temp.path()).unwrap();
+    let root = base.join("Game");
+    for name in ["Assets/Scripts", "Packages", "ProjectSettings", "Library/PackageCache", "Temp", "Logs"] {
+        std::fs::create_dir_all(root.join(name)).unwrap();
+    }
+    std::fs::write(root.join("ProjectSettings/ProjectVersion.txt"), "m_EditorVersion: 6000.0.62f1\n").unwrap();
+    std::fs::write(root.join("Assets/Scripts/Player.cs"), "class Player {}\n").unwrap();
+    std::fs::write(root.join("Packages/manifest.json"), "{}\n").unwrap();
+    std::fs::write(root.join("Library/PackageCache/Cached.cs"), "class Cached {}\n").unwrap();
+    std::fs::write(root.join("Temp/Temporary.cs"), "class Temporary {}\n").unwrap();
+    std::fs::write(root.join("Logs/Editor.log"), "log\n").unwrap();
+    let host = Host::new(HostConfig {
+        config_dir: base.join("config"),
+        data_dir: base.join("data"),
+        local_data_dir: base.join("data"),
+        languages: Arc::new(ide_language::LanguageRegistry::load(None).unwrap()),
+        syntax: Arc::default(),
+        sink_for: Box::new(|_| Arc::new(NullSink)),
+        owner: |w| w,
+        runtime: tokio::runtime::Handle::current(),
+        project_environment: false,
+    });
+    let project = host.open_project("main", &root).unwrap();
+    let info = ops::project::info(&project);
+    assert_eq!(info.name, "Game");
+    let unity = info.unity.unwrap();
+    assert_eq!(unity.editor_version.as_deref(), Some("6000.0.62f1"));
+    assert!(unity.projects.is_empty() && unity.solutions.is_empty());
+    assert!(project.index.wait_idle(Duration::from_secs(20)));
+    assert_eq!(project.index.find_files("Player.cs", 100).len(), 1);
+    for name in ["Cached.cs", "Temporary.cs", "Editor.log"] {
+        assert!(project.index.find_files(name, 100).is_empty(), "indexed generated file {name}");
+    }
+    let hits = Arc::new(std::sync::Mutex::new(Vec::new()));
+    let out = hits.clone();
+    let query = serde_json::from_value(serde_json::json!({
+        "pattern": "class", "isRegex": false, "caseSensitive": false, "wholeWord": false,
+        "include": [], "exclude": [], "scope": { "kind": "project" }, "maxMatches": 100,
+    }))
+    .unwrap();
+    ops::search::start(
+        &host,
+        "main",
+        RequestId::next(),
+        query,
+        Arc::new(move |event| {
+            if let ops::search::SearchEvent::File { file } = event {
+                out.lock().unwrap().push(file.rel_path);
+            }
+        }),
+    )
+    .await
+    .unwrap();
+    assert_eq!(*hits.lock().unwrap(), ["Assets/Scripts/Player.cs"]);
+    let listing = ops::fs::read_dir(&host, "main", root.clone()).await.unwrap();
+    assert!(listing.iter().any(|e| e.name == "Library" && e.excluded));
+    assert!(project.exclude_globs().contains(&"/Obj".to_owned()));
+
+    // Project metadata refreshes without reopening when Unity generates its solution.
+    std::fs::write(root.join("Game.sln"), "").unwrap();
+    std::fs::write(root.join("Assembly-CSharp.csproj"), "").unwrap();
+    let unity = ops::project::info(&project).unity.unwrap();
+    assert_eq!(unity.solutions, ["Game.sln"]);
+    assert_eq!(unity.projects, ["Assembly-CSharp.csproj"]);
+
+    // Desktop commands and remote RPC share these host operations.
+    let original = root.join("Assets/Scripts/Player.cs");
+    let renamed = root.join("Assets/Scripts/Hero.cs");
+    let copied = root.join("Assets/Scripts/HeroCopy.cs");
+    let meta = |path: &std::path::Path| -> std::path::PathBuf {
+        let mut name = path.as_os_str().to_os_string();
+        name.push(".meta");
+        name.into()
+    };
+    let original_metadata = "fileFormatVersion: 2\nguid: 11111111111111111111111111111111\n";
+    std::fs::write(meta(&original), original_metadata).unwrap();
+    ops::fs::rename(&host, original.clone(), renamed.clone()).await.unwrap();
+    assert!(!original.exists() && !meta(&original).exists());
+    assert_eq!(std::fs::read_to_string(meta(&renamed)).unwrap(), original_metadata);
+    ops::fs::copy(&host, renamed.clone(), copied.clone()).await.unwrap();
+    assert!(copied.exists());
+    assert_ne!(std::fs::read_to_string(meta(&copied)).unwrap(), original_metadata);
+    assert_eq!(std::fs::read_to_string(meta(&renamed)).unwrap(), original_metadata);
+    host.close_project("main");
+
+    let ordinary = base.join("ConsoleApp");
+    std::fs::create_dir(&ordinary).unwrap();
+    std::fs::write(ordinary.join("App.csproj"), "").unwrap();
+    let project = host.open_project("main", &ordinary).unwrap();
+    assert!(ops::project::info(&project).unity.is_none());
+    assert!(!project.exclude_globs().contains(&"/Library".to_owned()));
+    host.close_project("main");
+}
@@ -0,0 +1,209 @@
+//! A day with Git on a `fixtures/` project, through the `ops` the app's commands call: an edit
+//! marked in the gutter, Local Changes and its diff, a commit in the log, a branch, a stash, and
+//! a merge that conflicts, resolved and committed. Open documents follow every step.
+
+use ide_core::DocId;
+use ide_host::{Host, HostConfig, ops};
+use ide_vcs::{ChangeKind, CommitOptions, FileStatus, HunkKind, LogQuery};
+use std::path::{Path, PathBuf};
+use std::process::Command;
+use std::sync::Arc;
+use std::time::Duration;
+
+const WINDOW: &str = "main";
+/// The line every branch changes, in `src/lib.rs`.
+const LINE: &str = "pub fn format_price(cents: u64) -> String {";
+
+fn git(root: &Path, args: &[&str]) -> String {
+    let out = Command::new("git").current_dir(root).args(args).output().unwrap();
+    assert!(out.status.success(), "git {args:?}: {}", String::from_utf8_lossy(&out.stderr));
+    String::from_utf8(out.stdout).unwrap()
+}
+
+fn copy_dir(from: &Path, to: &Path) {
+    std::fs::create_dir_all(to).unwrap();
+    for entry in std::fs::read_dir(from).unwrap().flatten() {
+        let (src, dst) = (entry.path(), to.join(entry.file_name()));
+        if entry.file_type().unwrap().is_dir() {
+            copy_dir(&src, &dst);
+        } else {
+            std::fs::copy(&src, &dst).unwrap();
+        }
+    }
+}
+
+struct Flow {
+    host: Arc<Host>,
+    root: PathBuf,
+    _tmp: tempfile::TempDir,
+}
+
+impl Flow {
+    async fn new(fixture: &str) -> Self {
+        let tmp = tempfile::tempdir().unwrap();
+        let base = dunce::canonicalize(tmp.path()).unwrap();
+        let root = base.join(fixture);
+        copy_dir(&Path::new(env!("CARGO_MANIFEST_DIR")).join("../../fixtures").join(fixture), &root);
+        git(&root, &["init", "-q", "-b", "main"]);
+        for (key, value) in [
+            ("user.name", "Test"),
+            ("user.email", "[email protected]"),
+            ("commit.gpgsign", "false"),
+            ("core.autocrlf", "false"),
+        ] {
+            git(&root, &["config", key, value]);
+        }
+        git(&root, &["add", "-A"]);
+        git(&root, &["commit", "-q", "-m", "Initial commit"]);
+        let host = Arc::new(Host::new(HostConfig {
+            config_dir: base.join("config"),
+            data_dir: base.join("data"),
+            local_data_dir: base.join("data"),
+            languages: Arc::new(ide_language::LanguageRegistry::load(None).unwrap()),
+            syntax: Arc::default(),
+            sink_for: Box::new(|_| Arc::new(|_| {})),
+            owner: |w| w,
+            runtime: tokio::runtime::Handle::current(),
+            project_environment: false,
+        }));
+        host.trust.decide(&root, true, false).unwrap();
+        let project = ops::project::open(&host, WINDOW, &root).await.unwrap();
+        for _ in 0..500 {
+            if !project.repos().is_empty() {
+                break;
+            }
+            tokio::time::sleep(Duration::from_millis(10)).await;
+        }
+        Flow { host, root, _tmp: tmp }
+    }
+
+    async fn open(&self, file: &str) -> DocId {
+        ops::doc::open(&self.host, WINDOW, self.root.join(file)).await.unwrap().id
+    }
+
+    async fn text(&self, doc: DocId) -> String {
+        ops::doc::snapshot(&self.host, WINDOW, doc).await.unwrap().text
+    }
+
+    /// Types `with` over `LINE` in the editor (unsaved).
+    async fn edit_line(&self, doc: DocId, with: &str) {
+        let text = self.text(doc).await;
+        let current = text.lines().find(|l| l.starts_with("pub fn format_price")).unwrap().to_owned();
+        let project = self.host.project(WINDOW).unwrap();
+        project.documents.replace_all(doc, &text.replacen(&current, with, 1)).unwrap();
+    }
+
+    async fn save(&self, doc: DocId) {
+        ops::doc::save(&self.host, WINDOW, doc).await.unwrap();
+    }
+
+    async fn status(&self) -> Vec<FileStatus> {
+        ops::vcs::status(&self.host, WINDOW).await.unwrap()
+    }
+
+    async fn commit(&self, files: &[&str], message: &str) -> String {
+        let paths = files.iter().map(|f| self.root.join(f)).collect();
+        ops::vcs::vcs_stage(&self.host, WINDOW, paths).await.unwrap();
+        let options = CommitOptions { run_hooks: true, ..Default::default() };
+        ops::vcs::vcs_commit(&self.host, WINDOW, None, message.into(), options).await.unwrap()
+    }
+
+    async fn head(&self) -> ide_vcs::Commit {
+        let log = ops::vcs::vcs_log(&self.host, WINDOW, None, LogQuery::default()).await.unwrap();
+        log.into_iter().next().expect("a commit")
+    }
+}
+
+fn changed<'a>(status: &'a [FileStatus], file: &str) -> Option<&'a FileStatus> {
+    status.iter().find(|s| s.rel_path == file)
+}
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 4)]
+async fn change_commit_branch_stash_and_merge_a_conflict() {
+    let f = Flow::new("rust-app").await;
+    let lib_path = f.root.join("src/lib.rs");
+    let lib = f.open("src/lib.rs").await;
+    let original = f.text(lib).await;
+    let line = original.lines().position(|l| l == LINE).expect("the fixture's line") as u32;
+
+    // An edit in the editor: a modified line in the gutter, against HEAD, before saving.
+    let base = "pub fn format_price(cents: u64) -> String { // base";
+    f.edit_line(lib, base).await;
+    let hunks = ops::vcs::vcs_line_hunks(&f.host, WINDOW, lib_path.clone()).await.unwrap();
+    assert!(
+        matches!(&hunks[..], [h] if h.kind == HunkKind::Modified && h.start == line && h.old_text.contains(LINE)),
+        "{hunks:?}"
+    );
+    assert!(f.status().await.is_empty(), "nothing saved yet");
+
+    // Saved: Local Changes lists it, and its diff shows the edit.
+    f.save(lib).await;
+    let status = f.status().await;
+    assert_eq!(changed(&status, "src/lib.rs").and_then(|s| s.unstaged), Some(ChangeKind::Modified), "{status:?}");
+    let diff = ops::vcs::vcs_diff_text(&f.host, WINDOW, lib_path.clone(), false).await.unwrap();
+    assert!(diff.contains(&format!("-{LINE}")) && diff.contains(&format!("+{base}")), "{diff}");
+
+    // Commit: the log's head; nothing left to commit; no gutter marks.
+    let id = f.commit(&["src/lib.rs"], "Mark the base").await;
+    let head = f.head().await;
+    assert_eq!((head.id.as_str(), head.summary.as_str()), (id.as_str(), "Mark the base"));
+    assert!(f.status().await.is_empty());
+    assert!(ops::vcs::vcs_line_hunks(&f.host, WINDOW, lib_path.clone()).await.unwrap().is_empty());
+
+    // A branch changes the line its way.
+    ops::vcs::vcs_create_branch(&f.host, WINDOW, None, "feature".into(), None, true).await.unwrap();
+    let theirs = "pub fn format_price(cents: u64) -> String { // feature";
+    f.edit_line(lib, theirs).await;
+    f.save(lib).await;
+    f.commit(&["src/lib.rs"], "Feature's change").await;
+    let branches = ops::vcs::vcs_branches(&f.host, WINDOW, None).await.unwrap();
+    assert!(branches.iter().any(|b| b.name == "feature" && b.current), "{branches:?}");
+
+    // Back on main, the open file shows main's text.
+    ops::vcs::vcs_checkout(&f.host, WINDOW, None, "main".into(), false, None).await.unwrap();
+    assert!(f.text(lib).await.contains(base));
+
+    // Stash: work in progress put aside and brought back.
+    let main_rs = f.open("src/main.rs").await;
+    let wip = format!("{}// work in progress\n", f.text(main_rs).await);
+    f.host.project(WINDOW).unwrap().documents.replace_all(main_rs, &wip).unwrap();
+    f.save(main_rs).await;
+    ops::vcs::vcs_stash_push(&f.host, WINDOW, None, Some("wip".into()), false, false).await.unwrap();
+    assert!(f.status().await.is_empty());
+    assert!(!f.text(main_rs).await.contains("work in progress"));
+    let stashes = ops::vcs::vcs_stashes(&f.host, WINDOW, None).await.unwrap();
+    assert!(matches!(&stashes[..], [s] if s.message.contains("wip")), "{stashes:?}");
+    ops::vcs::vcs_stash_apply(&f.host, WINDOW, None, 0, true, false, None).await.unwrap();
+    assert_eq!(f.text(main_rs).await, wip);
+    assert!(ops::vcs::vcs_stashes(&f.host, WINDOW, None).await.unwrap().is_empty());
+    ops::vcs::vcs_discard(&f.host, WINDOW, vec![f.root.join("src/main.rs")]).await.unwrap();
+    assert!(f.status().await.is_empty());
+
+    // Main changes the same line: merging the branch conflicts.
+    let ours = "pub fn format_price(cents: u64) -> String { // main";
+    f.edit_line(lib, ours).await;
+    f.save(lib).await;
+    f.commit(&["src/lib.rs"], "Main's change").await;
+    let merged = ops::vcs::vcs_merge(&f.host, WINDOW, None, "feature".into()).await;
+    let status = f.status().await;
+    let conflicted = changed(&status, "src/lib.rs").map(|s| (s.staged, s.unstaged));
+    assert!(
+        matches!(conflicted, Some((Some(ChangeKind::Conflicted), _) | (_, Some(ChangeKind::Conflicted)))),
+        "merge: {merged:?}; status: {status:?}"
+    );
+    // The open file shows the conflict as Git left it.
+    assert!(f.text(lib).await.contains("<<<<<<<"), "{}", f.text(lib).await);
+    let versions = ops::vcs::vcs_conflict_versions(&f.host, WINDOW, lib_path.clone()).await.unwrap();
+    let has = |side: &Option<String>, line: &str| side.as_deref().is_some_and(|t| t.contains(line));
+    assert!(has(&versions.base, base) && has(&versions.ours, ours) && has(&versions.theirs, theirs), "{versions:?}");
+
+    // Resolved (Accept Theirs) and committed: a merge commit, nothing left.
+    let resolved = versions.theirs.clone().unwrap();
+    f.host.project(WINDOW).unwrap().documents.replace_all(lib, &resolved).unwrap();
+    f.save(lib).await;
+    f.commit(&["src/lib.rs"], "Merge feature").await;
+    let head = f.head().await;
+    assert_eq!(head.parents.len(), 2, "{head:?}");
+    assert!(f.status().await.is_empty());
+    assert_eq!(std::fs::read_to_string(&lib_path).unwrap(), resolved);
+}
@@ -175,3 +175,66 @@ async fn contended_version_reads_do_not_block_the_async_worker() {
        assert!(watchdog.join().unwrap(), "request {request_kind} blocked the only async worker");
    }
 }
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn code_actions_skip_a_command_no_server_provides_after_their_edit() {
+    use ide_lsp::types::{CodeAction, Command};
+    let tmp = tempfile::tempdir().unwrap();
+    let file = tmp.path().join("imports.txt");
+    std::fs::write(&file, "unused\nused\n").unwrap();
+    let host = Host::new(HostConfig {
+        config_dir: tmp.path().join("config"),
+        data_dir: tmp.path().join("data"),
+        local_data_dir: tmp.path().join("local-data"),
+        languages: Arc::new(ide_language::LanguageRegistry::load(None).unwrap()),
+        syntax: Arc::default(),
+        sink_for: Box::new(|_| Arc::new(|_| {})),
+        owner: |window| window,
+        runtime: tokio::runtime::Handle::current(),
+        project_environment: false,
+    });
+    host.open_light("main", &file).unwrap();
+    let info = ops::doc::open(&host, "main", file.clone()).await.unwrap();
+    // Optimize Imports as vtsls offers it: the edit, then a command its client runs itself.
+    let action = |edit: bool| CodeAction {
+        title: "Organize Imports".into(),
+        kind: Some("source.organizeImports".into()),
+        is_preferred: false,
+        disabled_reason: None,
+        edit: edit.then(|| {
+            serde_json::from_value(json!({ "files": [{ "kind": "edit", "path": file, "edits": [
+                { "range": { "start": { "line": 0, "col": 0 }, "end": { "line": 1, "col": 0 } }, "new_text": "" }
+            ] }] }))
+            .unwrap()
+        }),
+        command: Some(Command {
+            title: String::new(),
+            command: "_typescript.didOrganizeImports".into(),
+            arguments: vec![],
+        }),
+        data: None,
+        server: ide_core::ServerId(1),
+    };
+    let follow_up = action(true).command.unwrap();
+    let asked = ops::lsp::lsp_resolve_command(
+        &host,
+        "main",
+        ide_core::RequestId(1),
+        info.id,
+        ide_core::ServerId(1),
+        follow_up,
+        vec![],
+    )
+    .await;
+    assert!(matches!(asked, Ok(None)), "{asked:?}");
+    ops::lsp::lsp_execute_code_action(&host, "main", ide_core::RequestId(2), info.id, action(true), vec![])
+        .await
+        .unwrap();
+    assert_eq!(ops::doc::snapshot(&host, "main", info.id).await.unwrap().text, "used\n");
+    ops::lsp::lsp_apply_code_action(&host, "main", info.id, action(true)).await.unwrap();
+    assert_eq!(ops::doc::snapshot(&host, "main", info.id).await.unwrap().text, "");
+    // Without an edit the command is the action: it still can't run.
+    let ran =
+        ops::lsp::lsp_execute_code_action(&host, "main", ide_core::RequestId(3), info.id, action(false), vec![]).await;
+    assert!(ran.is_err(), "{ran:?}");
+}
@@ -114,3 +114,54 @@ async fn linked_projects_share_navigation_but_keep_files_repositories_and_run_di
    assert_eq!(automatic.index.find_files("same.txt", 100).len(), 1);
    host.close_project("main");
 }
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn php_language_level_follows_the_member_of_the_file() {
+    use ide_sdk::php::{PhpLanguageLevel, PhpLevelSource};
+    let temp = tempfile::tempdir().unwrap();
+    let base = dunce::canonicalize(temp.path()).unwrap();
+    let (api, legacy) = (base.join("api"), base.join("legacy"));
+    for (member, composer) in [
+        (&api, r#"{"require": {"php": "^7.4"}}"#),
+        (&legacy, r#"{"require": {"php": "^7.4"}, "config": {"platform": {"php": "8.0.5"}}}"#),
+    ] {
+        std::fs::create_dir(member).unwrap();
+        std::fs::write(member.join("composer.json"), composer).unwrap();
+    }
+    let root = base.join("workspace");
+    Workspace::save(&root, "PHP", vec![api.clone(), legacy.clone()], true).unwrap();
+    std::fs::write(root.join("composer.json"), r#"{"require": {"php": "^8.2"}}"#).unwrap();
+    let config_dir = base.join("config");
+    ide_workspace::SettingsStore::load(&config_dir, Some(&legacy))
+        .set(ide_workspace::SettingsScope::Project, "languages.php.languageLevel", "8.3".into())
+        .unwrap();
+    let host = Host::new(HostConfig {
+        config_dir,
+        data_dir: base.join("data"),
+        local_data_dir: base.join("data"),
+        languages: Arc::new(ide_language::LanguageRegistry::load(None).unwrap()),
+        syntax: Arc::default(),
+        sink_for: Box::new(|_| Arc::new(NullSink)),
+        owner: |w| w,
+        runtime: tokio::runtime::Handle::current(),
+        project_environment: false,
+    });
+    host.trust.decide(&root, true, false).unwrap();
+    host.open_project("main", &root).unwrap();
+    let found = |version: &str, source| Some(PhpLanguageLevel { version: version.into(), source });
+    let level = async |path: std::path::PathBuf| ops::sdk::sdk_php_language_level(&host, "main", path).await.unwrap();
+
+    let level_of_api = level(api.join("src/Invoice.php")).await;
+    assert_eq!(level_of_api.effective, found("7.4.0", PhpLevelSource::Require));
+    assert_eq!(level_of_api.auto, level_of_api.effective);
+    assert_eq!(level_of_api.member.as_deref(), Some(api.as_path()));
+    // The member's own settings, not the workspace's.
+    let level_of_legacy = level(legacy.join("index.php")).await;
+    assert_eq!(level_of_legacy.effective, found("8.3.0", PhpLevelSource::Settings));
+    assert_eq!(level_of_legacy.auto, found("8.0.5", PhpLevelSource::Platform));
+    // Outside every member: the workspace's own.
+    let level_elsewhere = level(base.join("elsewhere.php")).await;
+    assert_eq!(level_elsewhere.effective, found("8.2.0", PhpLevelSource::Require));
+    assert_eq!(level_elsewhere.member, None);
+    host.close_project("main");
+}
@@ -14,6 +14,9 @@ fn bench(c: &mut Criterion) {
    for q in ["ordcon", "src/user", "PaymentService", "zzzz", "a"] {
        g.bench_function(format!("find_files/{q}"), |b| b.iter(|| black_box(index.find_files(q, 50).len())));
    }
+    for q in ["util", "src/ui", "a"] {
+        g.bench_function(format!("find_dirs/{q}"), |b| b.iter(|| black_box(index.find_dirs(q, 50).len())));
+    }
    for q in ["OCo", "invoiceRepo", "renderView", "q"] {
        g.bench_function(format!("find_symbols/{q}"), |b| {
            b.iter(|| black_box(index.find_symbols(q, SymbolFilter::All, 50).len()))
@@ -40,6 +40,8 @@ pub(crate) struct FileRecord {
    pub size: u64,
    pub hash: [u8; 32],
    pub symbols: Vec<StoredSymbol>,
+    /// Matched by an ignore file: listed by name only (no hash, no symbols).
+    pub ignored: bool,
 }

 #[derive(Clone, Debug, Serialize, Deserialize)]
@@ -72,6 +74,7 @@ pub(crate) struct FileEntry {
    pub size: u64,
    pub hash: [u8; 32],
    pub symbols: Box<[Sym]>,
+    pub ignored: bool,
 }

 impl FileEntry {
@@ -100,6 +103,7 @@ impl FileEntry {
            size: record.size,
            hash: record.hash,
            symbols,
+            ignored: record.ignored,
        }
    }

@@ -126,14 +130,23 @@ impl FileEntry {
                    range: s.range,
                })
                .collect(),
+            ignored: self.ignored,
        }
    }
+
+    /// Whether the entry is out of date for `found` on disk.
+    pub(crate) fn stale_for(&self, found: &crate::filter::Found) -> bool {
+        self.mtime != found.mtime || self.size != found.size || self.ignored != found.ignored
+    }
 }

 #[derive(Default)]
 pub(crate) struct IndexData {
    pub files: Vec<Option<FileEntry>>,
    by_path: HashMap<PathBuf, u32>,
+    /// Every folder holding an indexed file at any depth, keyed by its `rel` with a
+    /// trailing `/`: its absolute path and the number of files below it.
+    pub dirs: HashMap<Box<str>, (PathBuf, u32)>,
    free: Vec<u32>,
    pub file_count: u32,
    pub symbol_count: u32,
@@ -167,6 +180,11 @@ impl IndexData {
            }
        };
        let path = self.files[slot as usize].as_ref().map(|e| e.path.clone()).unwrap_or_default();
+        if let Some(e) = &self.files[slot as usize] {
+            for (rel, abs) in ancestors(e) {
+                self.dirs.entry(rel.into()).or_insert_with(|| (abs.to_owned(), 0)).1 += 1;
+            }
+        }
        self.by_path.insert(path, slot);
        self.file_count += 1;
        self.symbol_count += symbols;
@@ -176,6 +194,14 @@ impl IndexData {
        let slot = self.by_path.remove(path)?;
        let old = self.files[slot as usize].take()?;
        self.free.push(slot);
+        for (rel, _) in ancestors(&old) {
+            if let Some(d) = self.dirs.get_mut(rel) {
+                d.1 -= 1;
+                if d.1 == 0 {
+                    self.dirs.remove(rel);
+                }
+            }
+        }
        self.file_count -= 1;
        self.symbol_count -= old.symbols.len() as u32;
        Some(old)
@@ -197,6 +223,7 @@ impl IndexData {
        self.files.shrink_to_fit();
        self.free.shrink_to_fit();
        self.by_path.shrink_to_fit();
+        self.dirs.shrink_to_fit();
    }

    pub(crate) fn paths(&self) -> impl Iterator<Item = &PathBuf> {
@@ -204,6 +231,19 @@ impl IndexData {
    }
 }

+/// The folders holding `e` (`rel` with a trailing `/`, absolute path), innermost first.
+fn ancestors(e: &FileEntry) -> impl Iterator<Item = (&str, &Path)> {
+    let mut rel = e.dir();
+    let mut abs = e.path.parent();
+    std::iter::from_fn(move || {
+        let path = abs.filter(|_| !rel.is_empty())?;
+        let here = rel;
+        rel = rel[..rel.len() - 1].rfind('/').map_or("", |i| &rel[..=i]);
+        abs = path.parent();
+        Some((here, path))
+    })
+}
+
 #[cfg(test)]
 mod tests {
    use super::*;
@@ -223,6 +263,23 @@ mod tests {
        FileEntry::new(PathBuf::from("/r").join(path), path.to_owned(), record)
    }

+    #[test]
+    fn dirs_follow_inserts_and_removals() {
+        let mut d = IndexData::default();
+        d.insert(entry("a/b/c.rs", 0));
+        d.insert(entry("a/d.rs", 0));
+        d.insert(entry("a/d.rs", 0));
+        d.insert(entry("top.rs", 0));
+        let mut dirs: Vec<_> = d.dirs.iter().map(|(k, v)| (k.to_string(), v.1)).collect();
+        dirs.sort();
+        assert_eq!(dirs, [("a/".into(), 2), ("a/b/".into(), 1)]);
+        assert_eq!(d.dirs["a/b/"].0, PathBuf::from("/r/a/b"));
+        d.remove(Path::new("/r/a/b/c.rs"));
+        assert!(!d.dirs.contains_key("a/b/"));
+        d.remove_tree(Path::new("/r/a"));
+        assert!(d.dirs.is_empty());
+    }
+
    #[test]
    fn insert_replace_remove_keep_counts() {
        let mut d = IndexData::default();
@@ -1,10 +1,16 @@
 //! Which paths belong in the index: `.gitignore`/`.ignore` rules (via the
 //! `ignore` crate) plus the user's `files.exclude` globs, below the project root
 //! and the extra content roots (Project Structure).
+//!
+//! Like IDEA, ignored directories are left out entirely, while ignored files in
+//! the remaining directories (`.env`) are listed by name only, so Go to File finds
+//! them but their symbols stay out of the index.

 use globset::{GlobBuilder, GlobSet, GlobSetBuilder};
 use ignore::gitignore::{Gitignore, GitignoreBuilder};
 use ignore::{WalkBuilder, WalkState};
+use std::collections::HashMap;
+use std::collections::hash_map::Entry;
 use std::path::{Path, PathBuf};
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::mpsc;
@@ -57,11 +63,25 @@ fn rel_string(rel: &Path) -> String {
    out
 }

+/// Whether `path` below `root` matches the exclude globs.
+fn glob_excluded(excludes: &GlobSet, root: &Path, path: &Path) -> bool {
+    match path.strip_prefix(root) {
+        Ok(rel) if !rel.as_os_str().is_empty() => {
+            let rel = rel.to_string_lossy();
+            let rel = if std::path::MAIN_SEPARATOR == '/' { rel } else { rel.replace('\\', "/").into() };
+            excludes.is_match(rel.as_ref())
+        }
+        _ => false,
+    }
+}
+
 #[derive(Clone, Debug)]
 pub(crate) struct Found {
    pub path: PathBuf,
    pub mtime: u64,
    pub size: u64,
+    /// Matched by an ignore file: listed by name only.
+    pub ignored: bool,
 }

 pub(crate) fn mtime_of(meta: &std::fs::Metadata) -> u64 {
@@ -177,8 +197,9 @@ impl PathFilter {
        ALWAYS_SKIP.contains(&name)
    }

-    /// Whether a path reported by the watcher should be ignored (outside the
-    /// root, inside an excluded/ignored directory, or ignored itself).
+    /// Whether a path reported by the watcher should be left out (outside the
+    /// root, excluded, or an ignored directory or inside one). Ignored files
+    /// elsewhere stay in, listed by name only.
    pub(crate) fn is_excluded(&self, path: &Path, is_dir: bool) -> bool {
        let Some((base, _, gitignore)) = self.base_of(path) else { return true };
        let rel = path.strip_prefix(base).map(rel_string).unwrap_or_default();
@@ -198,16 +219,27 @@ impl PathFilter {
                return true;
            }
        }
-        gitignore.matched_path_or_any_parents(path, is_dir).is_ignore()
+        let dir = if is_dir { Some(path) } else { path.parent().filter(|p| *p != base) };
+        dir.is_some_and(|d| gitignore.matched_path_or_any_parents(d, true).is_ignore())
    }

    /// All indexable files at or below `dir`, walked in parallel.
    /// Stops early (returning what was found so far) once `cancel` is set.
    pub(crate) fn walk(&self, dir: &Path, cancel: &AtomicBool) -> Vec<Found> {
+        self.walk_to(dir, None, cancel)
+    }
+
+    /// The indexable files directly in `dir`, classified by the same rules as [`Self::walk`].
+    pub(crate) fn list_dir(&self, dir: &Path) -> Vec<Found> {
+        self.walk_to(dir, Some(1), &AtomicBool::new(false))
+    }
+
+    fn walk_to(&self, dir: &Path, max_depth: Option<usize>, cancel: &AtomicBool) -> Vec<Found> {
        let (tx, rx) = mpsc::channel::<Vec<Found>>();
        let Some((root, _, _)) = self.base_of(dir) else { return Vec::new() };
        let root = root.to_path_buf();
        let excludes = self.excludes.clone();
+        let (walk_root, walk_excludes) = (root.clone(), excludes.clone());
        let walker = WalkBuilder::new(dir)
            .hidden(false)
            .parents(true)
@@ -215,43 +247,65 @@ impl PathFilter {
            .git_ignore(true)
            .git_global(true)
            .git_exclude(true)
-            .require_git(false)
+            .require_git(ide_core::ignored::inside_git_repo(dir))
            .follow_links(false)
+            .max_depth(max_depth)
            .filter_entry(move |e| {
                let name = e.file_name().to_string_lossy();
-                if Self::skip_name(&name) {
-                    return false;
-                }
-                match e.path().strip_prefix(&root) {
-                    Ok(rel) if !rel.as_os_str().is_empty() => {
-                        let rel = rel.to_string_lossy();
-                        let rel = if std::path::MAIN_SEPARATOR == '/' { rel } else { rel.replace('\\', "/").into() };
-                        !excludes.is_match(rel.as_ref())
-                    }
-                    _ => true,
-                }
+                !Self::skip_name(&name) && !glob_excluded(&walk_excludes, &walk_root, e.path())
            })
            .build_parallel();
        walker.run(|| {
+            let (root, excludes) = (&root, &excludes);
            let mut batch = Batch { tx: tx.clone(), items: Vec::with_capacity(256) };
            Box::new(move |entry| {
                if cancel.load(Ordering::Relaxed) {
                    return WalkState::Quit;
                }
                let Ok(entry) = entry else { return WalkState::Continue };
-                if entry.file_type().is_some_and(|t| t.is_file())
+                let Some(file_type) = entry.file_type() else { return WalkState::Continue };
+                if file_type.is_dir() && max_depth.is_none_or(|max| entry.depth() < max) {
+                    // The walker drops ignored files unseen: list every file of a
+                    // walked directory; those the walker doesn't report are ignored.
+                    let Ok(children) = std::fs::read_dir(entry.path()) else { return WalkState::Continue };
+                    for child in children.flatten() {
+                        let path = child.path();
+                        if child.file_type().is_ok_and(|t| t.is_file())
+                            && !Self::skip_name(&child.file_name().to_string_lossy())
+                            && !glob_excluded(excludes, root, &path)
+                            && let Ok(meta) = child.metadata()
+                        {
+                            batch.items.push(Found { path, mtime: mtime_of(&meta), size: meta.len(), ignored: true });
+                        }
+                    }
+                } else if file_type.is_file()
                    && let Ok(meta) = entry.metadata()
                {
-                    batch.items.push(Found { path: entry.into_path(), mtime: mtime_of(&meta), size: meta.len() });
-                    if batch.items.len() >= 256 && batch.tx.send(std::mem::take(&mut batch.items)).is_err() {
-                        return WalkState::Quit;
-                    }
+                    batch.items.push(Found {
+                        path: entry.into_path(),
+                        mtime: mtime_of(&meta),
+                        size: meta.len(),
+                        ignored: false,
+                    });
+                }
+                if batch.items.len() >= 256 && batch.tx.send(std::mem::take(&mut batch.items)).is_err() {
+                    return WalkState::Quit;
                }
                WalkState::Continue
            })
        });
        drop(tx);
-        rx.into_iter().flatten().collect()
+        // Each file comes once from its directory listing and, unless ignored, once from the walker.
+        let mut by_path: HashMap<PathBuf, Found> = HashMap::new();
+        for f in rx.into_iter().flatten() {
+            match by_path.entry(f.path.clone()) {
+                Entry::Occupied(mut e) => e.get_mut().ignored &= f.ignored,
+                Entry::Vacant(e) => {
+                    e.insert(f);
+                }
+            }
+        }
+        by_path.into_values().collect()
    }
 }

@@ -311,6 +365,103 @@ mod tests {
        assert!(!filter.is_excluded(&root.join("src/new.rs"), false));
    }

+    #[test]
+    fn ignored_files_are_listed_but_ignored_directories_are_not() {
+        let dir = tempfile::tempdir().unwrap();
+        let root = dunce::canonicalize(dir.path()).unwrap();
+        for f in [
+            ".env",
+            "src/a.rs",
+            "src/debug.log",
+            "src/local/secrets.json",
+            "pkg/.gitignore",
+            "pkg/gen.rs",
+            "pkg/keep.rs",
+            "build/out.rs",
+            "build/nested/deep.rs",
+            "logs/app.log",
+            "node_modules/x/.env",
+            "src/.DS_Store",
+            "src/.git",
+        ] {
+            touch(&root, f);
+        }
+        std::fs::write(
+            root.join(".gitignore"),
+            ".env
+*.log
+build/
+logs/
+src/local/
+",
+        )
+        .unwrap();
+        std::fs::write(
+            root.join("pkg/.gitignore"),
+            "gen.rs
+",
+        )
+        .unwrap();
+        let filter = PathFilter::new(&root, &vec![].into(), &["**/node_modules".into(), "**/.DS_Store".into()]);
+        let mut found: Vec<(String, bool)> = filter
+            .walk(&root, &AtomicBool::new(false))
+            .iter()
+            .filter_map(|f| Some((filter.rel(&f.path)?, f.ignored)))
+            .collect();
+        found.sort();
+        let expected = [
+            (".env", true),
+            (".gitignore", false),
+            ("pkg/.gitignore", false),
+            ("pkg/gen.rs", true),
+            ("pkg/keep.rs", false),
+            ("src/a.rs", false),
+            ("src/debug.log", true),
+        ];
+        assert_eq!(found, expected.map(|(p, i)| (p.to_owned(), i)));
+
+        // One directory at a time (watcher updates): same classification, no descent.
+        let mut listed: Vec<(String, bool)> =
+            filter.list_dir(&root.join("pkg")).iter().filter_map(|f| Some((filter.rel(&f.path)?, f.ignored))).collect();
+        listed.sort();
+        let expected = [("pkg/.gitignore", false), ("pkg/gen.rs", true), ("pkg/keep.rs", false)];
+        assert_eq!(listed, expected.map(|(p, i)| (p.to_owned(), i)));
+        let top: Vec<String> = filter.list_dir(&root).iter().filter_map(|f| filter.rel(&f.path)).collect();
+        assert!(top.iter().all(|p| !p.contains('/')), "{top:?}");
+
+        for (rel, excluded) in [
+            (".env", false),
+            ("src/new.log", false),
+            ("src/new.rs", false),
+            ("build/x.rs", true),
+            ("logs/app.log", true),
+            ("src/local/x.json", true),
+        ] {
+            assert_eq!(filter.is_excluded(&root.join(rel), false), excluded, "{rel}");
+        }
+        assert!(filter.is_excluded(&root.join("build"), true));
+        assert!(!filter.is_excluded(&root.join("src"), true));
+    }
+
+    #[test]
+    fn a_nested_repository_is_not_hidden_by_the_outer_repositorys_gitignore() {
+        let dir = tempfile::tempdir().unwrap();
+        let base = dunce::canonicalize(dir.path()).unwrap();
+        for f in ["projects/nested/src/a.rs", "projects/nested/out/x.rs"] {
+            touch(&base, f);
+        }
+        std::fs::create_dir(base.join(".git")).unwrap();
+        std::fs::create_dir(base.join("projects/nested/.git")).unwrap();
+        std::fs::write(base.join("projects/.gitignore"), "*\n!.gitignore\n").unwrap();
+        std::fs::write(base.join("projects/nested/.gitignore"), "out/\n").unwrap();
+        let root = base.join("projects/nested");
+        let filter = PathFilter::new(&root, &vec![].into(), &[]);
+        let mut found: Vec<String> =
+            filter.walk(&root, &AtomicBool::new(false)).iter().filter_map(|f| filter.rel(&f.path)).collect();
+        found.sort();
+        assert_eq!(found, [".gitignore", "src/a.rs"]);
+    }
+
    #[test]
    fn extra_content_roots_are_walked_and_prefixed() {
        let dir = tempfile::tempdir().unwrap();
@@ -8,6 +8,7 @@ use ide_language::{LanguageRegistry, Syntax};
 use parking_lot::Mutex;
 use serde::{Deserialize, Serialize};
 use specta::Type;
+use std::collections::HashMap;
 use std::path::{Path, PathBuf};
 use std::sync::Arc;
 use std::sync::atomic::Ordering;
@@ -64,6 +65,14 @@ pub struct IndexStatus {
    pub symbols: u32,
 }

+/// How many indexed files share an extension (lower case, without the dot).
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize, Type)]
+#[serde(rename_all = "camelCase")]
+pub struct ExtensionCount {
+    pub extension: String,
+    pub files: u32,
+}
+
 pub struct ProjectIndex {
    shared: Arc<Shared>,
    worker: Mutex<Option<JoinHandle<()>>>,
@@ -159,6 +168,27 @@ impl ProjectIndex {
        }
    }

+    /// The extensions of the indexed files, most common first: the project's file
+    /// types, for suggestions such as Find in Files' file masks. Dotfiles
+    /// (`.gitignore`) have no extension.
+    pub fn file_extensions(&self) -> Vec<ExtensionCount> {
+        let d = self.shared.data.read();
+        let mut counts: HashMap<String, u32> = HashMap::new();
+        for file in d.files.iter().flatten() {
+            let name = &file.rel[file.name_start as usize..];
+            if let Some((stem, extension)) = name.rsplit_once('.')
+                && !stem.is_empty()
+                && !extension.is_empty()
+            {
+                *counts.entry(extension.to_ascii_lowercase()).or_default() += 1;
+            }
+        }
+        let mut out: Vec<ExtensionCount> =
+            counts.into_iter().map(|(extension, files)| ExtensionCount { extension, files }).collect();
+        out.sort_by(|a, b| b.files.cmp(&a.files).then_with(|| a.extension.cmp(&b.extension)));
+        out
+    }
+
    /// Fuzzy file search. IDEA-like ranking: file-name matches beat directory
    /// matches; `/` in the query matches path segments; recently opened files boost.
    pub fn find_files(&self, query: &str, limit: usize) -> Vec<FileMatch> {
@@ -167,6 +197,11 @@ impl ProjectIndex {
        matching::find_files(&d, &matching::Recents { paths: &recent }, query, limit)
    }

+    /// Fuzzy search for folders that hold indexed files; `rel_path` ends in `/`.
+    pub fn find_dirs(&self, query: &str, limit: usize) -> Vec<FileMatch> {
+        matching::find_dirs(&self.shared.data.read(), query, limit)
+    }
+
    /// Fuzzy symbol search; CamelHump aware (`OCo` → `OrderController`).
    pub fn find_symbols(&self, query: &str, filter: SymbolFilter, limit: usize) -> Vec<SymbolMatch> {
        let recent = self.shared.recent.lock().clone();
@@ -366,6 +401,10 @@ pub mod bench_support {
            matching::find_files(&self.data, &matching::Recents { paths: &self.recent }, query, limit)
        }

+        pub fn find_dirs(&self, query: &str, limit: usize) -> Vec<FileMatch> {
+            matching::find_dirs(&self.data, query, limit)
+        }
+
        pub fn find_symbols(&self, query: &str, filter: SymbolFilter, limit: usize) -> Vec<SymbolMatch> {
            matching::find_symbols(&self.data, &matching::Recents { paths: &self.recent }, query, filter, limit)
        }
@@ -12,7 +12,7 @@ use nucleo_matcher::{Config, Matcher, Utf32Str, Utf32String};
 use rayon::prelude::*;
 use std::cell::RefCell;
 use std::cmp::Ordering;
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};

 const TIER_NAME: u32 = 1 << 20;
 const EXACT: u32 = 4000;
@@ -251,6 +251,76 @@ pub(crate) fn find_files(data: &IndexData, recents: &Recents, query: &str, limit
        .collect()
 }

+/// Fuzzy folder search over the folders holding indexed files: folder-name matches beat
+/// path matches; `/` in the query matches the whole path. `rel_path` ends in `/`.
+pub(crate) fn find_dirs(data: &IndexData, query: &str, limit: usize) -> Vec<FileMatch> {
+    let q = normalize_file_query(query);
+    if limit == 0 || q.is_empty() {
+        return Vec::new();
+    }
+    let by_path = q.contains('/');
+    let needle = Needle::new(q.trim_end_matches('/'));
+    // (score, rel without the trailing `/`, char offset of the name when it matched by name)
+    let score = |m: &mut Matcher, buf: &mut Vec<char>, rel: &str| -> Option<(u32, Option<u32>)> {
+        let trimmed = &rel[..rel.len() - 1];
+        let start = trimmed.rfind('/').map_or(0, |i| i + 1);
+        let name = &trimmed[start..];
+        if !by_path
+            && needle.mask & char_mask(name) == needle.mask
+            && let Some(s) = needle.score(m, name, buf)
+        {
+            return Some((TIER_NAME + s * 4 + needle.name_boost(name), Some(trimmed[..start].chars().count() as u32)));
+        }
+        if needle.mask & char_mask(trimmed) != needle.mask {
+            return None;
+        }
+        needle.score(m, trimmed, buf).map(|s| (s, None))
+    };
+    let mut best: Vec<(u32, &str, &Path, Option<u32>)> = data
+        .dirs
+        .par_iter()
+        .filter_map(|(rel, (path, _))| {
+            let mut buf = Vec::new();
+            with_matcher(|m| score(m, &mut buf, rel)).map(|(s, at)| (s, &**rel, path.as_path(), at))
+        })
+        .collect();
+    let order = |a: &(u32, &str, &Path, Option<u32>), b: &(u32, &str, &Path, Option<u32>)| {
+        b.0.cmp(&a.0).then_with(|| a.1.len().cmp(&b.1.len())).then_with(|| a.1.cmp(b.1))
+    };
+    if best.len() > limit {
+        best.select_nth_unstable_by(limit, order);
+        best.truncate(limit);
+    }
+    // Match indices and the CamelHump bonus `find_files` gives, so equal matches rank alike.
+    let mut out: Vec<FileMatch> = with_matcher(|m| {
+        let (mut buf, mut idx) = (Vec::new(), Vec::new());
+        best.into_iter()
+            .map(|(score, rel, path, name_at)| {
+                let trimmed = &rel[..rel.len() - 1];
+                let (bonus, indices) = match name_at {
+                    Some(at) => {
+                        let name = &trimmed[trimmed.rfind('/').map_or(0, |i| i + 1)..];
+                        needle.indices(m, name, &mut buf, &mut idx);
+                        (hump_bonus(name, &idx), idx.iter().map(|i| i + at).collect())
+                    }
+                    None => {
+                        needle.indices(m, trimmed, &mut buf, &mut idx);
+                        (hump_bonus(trimmed, &idx), idx.clone())
+                    }
+                };
+                FileMatch { path: path.to_path_buf().into(), rel_path: rel.to_owned(), score: score + bonus, indices }
+            })
+            .collect()
+    });
+    out.sort_by(|a, b| {
+        b.score
+            .cmp(&a.score)
+            .then_with(|| a.rel_path.len().cmp(&b.rel_path.len()))
+            .then_with(|| a.rel_path.cmp(&b.rel_path))
+    });
+    out
+}
+
 fn file(data: &IndexData, slot: u32) -> &FileEntry {
    data.files[slot as usize].as_ref().expect("candidate slots are live")
 }
@@ -8,7 +8,7 @@ use std::path::Path;
 const FILES: TableDefinition<&str, &[u8]> = TableDefinition::new("files");
 const META: TableDefinition<&str, &[u8]> = TableDefinition::new("meta");
 /// Bump when [`FileRecord`] or its encoding changes.
-const SCHEMA: &str = "openidea-index-2";
+const SCHEMA: &str = "openidea-index-3";

 type Result<T> = std::result::Result<T, String>;

@@ -111,6 +111,28 @@ fn indexes_files_and_symbols_honouring_excludes() {
    assert_eq!(m.path, fx.root.join("src/main.rs"));
 }

+#[test]
+fn counts_file_extensions_most_common_first() {
+    let fx = Fixture::new(&[
+        ("src/a.rs", "fn a() {}\n"),
+        ("src/b.RS", "fn b() {}\n"),
+        ("src/lib.rs", "fn c() {}\n"),
+        ("Cargo.toml", "[package]\n"),
+        ("README.md", "# r\n"),
+        ("docs/guide.md", "# g\n"),
+        (".gitignore", "target\n"),
+        ("Makefile", "all:\n"),
+        ("target/debug/gen.rs", "fn generated() {}\n"),
+    ]);
+    let idx = fx.open();
+    let counts: Vec<(String, u32)> = idx.file_extensions().into_iter().map(|c| (c.extension, c.files)).collect();
+    assert_eq!(
+        counts,
+        [("rs".into(), 3), ("md".into(), 2), ("toml".into(), 1)],
+        "case-folded, excluded folders and extension-less files left out"
+    );
+}
+
 #[test]
 fn file_ranking_is_idea_like() {
    let fx = sample();
@@ -138,6 +160,23 @@ fn file_ranking_is_idea_like() {
    assert_eq!(shown.to_lowercase(), "uibtn");
 }

+#[test]
+fn find_dirs_ranks_folder_names() {
+    let f = sample();
+    let idx = f.open();
+    let dirs = |q: &str| idx.find_dirs(q, 20).into_iter().map(|m| m.rel_path).collect::<Vec<_>>();
+    assert_eq!(dirs("order"), ["src/order/"]);
+    assert_eq!(dirs("src")[0], "src/");
+    assert!(dirs("src").contains(&"src/ui/".to_owned()), "{:?}", dirs("src"));
+    assert_eq!(dirs("src/ui/"), ["src/ui/"]);
+    assert!(dirs("").is_empty());
+    assert!(dirs("main").is_empty());
+
+    let m = &idx.find_dirs("ui", 1)[0];
+    assert_eq!(m.path.0, f.root.join("src/ui"));
+    assert_eq!(m.indices, vec![4, 5]);
+}
+
 #[test]
 fn shorter_paths_win_ties_and_recent_files_boost() {
    let fx = Fixture::new(&[("a/b/c/util.rs", ""), ("x/util.rs", ""), ("y/util.rs", "")]);
@@ -276,6 +315,56 @@ fn binary_and_huge_files_are_listed_without_symbols() {
    assert_eq!(idx.status().symbols, 0);
 }

+#[test]
+fn go_to_file_finds_ignored_files_but_not_their_symbols() {
+    let fx = Fixture::new(&[
+        (".gitignore", ".env\n*.local.ts\ndist/\n"),
+        (".env", "SECRET=1\n"),
+        ("src/app.ts", "export function app() {}\n"),
+        ("src/config.local.ts", "export function localOnly() {}\n"),
+        ("dist/bundle.js", "function bundled() {}\n"),
+    ]);
+    let idx = fx.open();
+    assert_eq!(files(&idx, ".env"), vec![".env"], "the reported case: a git-ignored root file");
+    assert_eq!(files(&idx, "config.local"), vec!["src/config.local.ts"]);
+    assert!(files(&idx, "bundle").is_empty(), "ignored directories stay out");
+    assert!(symbols(&idx, "localOnly", SymbolFilter::All).is_empty(), "ignored files are listed by name only");
+    assert_eq!(symbols(&idx, "app", SymbolFilter::All), vec!["app"]);
+
+    // Watcher updates keep the distinction.
+    let fresh = fx.write("src/fresh.local.ts", "export function freshLocal() {}\n");
+    let bundled = fx.write("dist/more.js", "function more() {}\n");
+    idx.update(&[fresh, bundled], &[]);
+    assert!(idx.wait_idle(WAIT));
+    assert_eq!(files(&idx, "fresh.local"), vec!["src/fresh.local.ts"]);
+    assert!(symbols(&idx, "freshLocal", SymbolFilter::All).is_empty());
+    assert!(files(&idx, "more.js").is_empty());
+
+    // Nested ignore files apply to watcher updates as they do to the scan.
+    fx.write("pkg/.gitignore", "gen.ts\n");
+    let generated = fx.write("pkg/gen.ts", "export function generatedThing() {}\n");
+    let kept = fx.write("pkg/kept.ts", "export function keptThing() {}\n");
+    idx.update(&[generated, kept], &[]);
+    assert!(idx.wait_idle(WAIT));
+    assert_eq!(files(&idx, "pkg/gen"), vec!["pkg/gen.ts"]);
+    assert!(symbols(&idx, "generatedThing", SymbolFilter::All).is_empty());
+    assert_eq!(symbols(&idx, "keptThing", SymbolFilter::All), vec!["keptThing"]);
+    drop(idx);
+
+    // No longer ignored: the next scan parses it although its mtime is unchanged.
+    std::fs::write(fx.root.join(".gitignore"), ".env\ndist/\n").unwrap();
+    let idx = fx.open();
+    assert_eq!(symbols(&idx, "localOnly", SymbolFilter::All), vec!["localOnly"]);
+    assert_eq!(files(&idx, ".env"), vec![".env"]);
+    drop(idx);
+
+    // Ignored again: its symbols are dropped.
+    std::fs::write(fx.root.join(".gitignore"), "*.local.ts\n").unwrap();
+    let idx = fx.open();
+    assert!(symbols(&idx, "localOnly", SymbolFilter::All).is_empty());
+    assert_eq!(files(&idx, "bundle"), vec!["dist/bundle.js"]);
+}
+
 #[test]
 fn second_window_on_same_project_works_in_memory() {
    let fx = sample();
@@ -2,13 +2,13 @@
 //! updates queued by the watcher.

 use crate::data::{FileEntry, FileRecord, IndexData, StoredSymbol};
-use crate::filter::{Found, PathFilter, mtime_of};
+use crate::filter::{Found, PathFilter};
 use crate::store::Store;
 use ide_core::{IdeEvent, SharedSink, TaskId};
 use ide_language::{LanguageRegistry, Syntax};
 use parking_lot::{Condvar, Mutex, RwLock};
 use rayon::prelude::*;
-use std::collections::{HashSet, VecDeque};
+use std::collections::{HashMap, HashSet, VecDeque};
 use std::io::Read;
 use std::path::{Path, PathBuf};
 use std::sync::atomic::{AtomicBool, Ordering};
@@ -233,10 +233,7 @@ impl Shared {
        let seen: HashSet<&Path> = found.iter().map(|f| f.path.as_path()).collect();
        let (todo, stale): (Vec<&Found>, Vec<PathBuf>) = {
            let d = self.data.read();
-            let todo = found
-                .iter()
-                .filter(|f| d.get(&f.path).is_none_or(|e| e.mtime != f.mtime || e.size != f.size))
-                .collect();
+            let todo = found.iter().filter(|f| d.get(&f.path).is_none_or(|e| e.stale_for(f))).collect();
            let stale = d.paths().filter(|p| !seen.contains(p.as_path())).cloned().collect();
            (todo, stale)
        };
@@ -311,6 +308,7 @@ impl Shared {
                        let mut rec = d.get(&f.path)?.record();
                        rec.mtime = f.mtime;
                        rec.size = f.size;
+                        rec.ignored = f.ignored;
                        Some((rel, rec, f.path.clone()))
                    }
                    Extracted::New(rec) => Some((rel, rec, f.path.clone())),
@@ -342,8 +340,8 @@ impl Shared {
    }

    fn extract(&self, f: &Found, prev_hash: Option<[u8; 32]>) -> Extracted {
-        let mut rec = FileRecord { mtime: f.mtime, size: f.size, ..Default::default() };
-        if f.size > MAX_SYMBOL_FILE {
+        let mut rec = FileRecord { mtime: f.mtime, size: f.size, ignored: f.ignored, ..Default::default() };
+        if f.ignored || f.size > MAX_SYMBOL_FILE {
            return Extracted::New(rec);
        }
        let mut bytes = Vec::with_capacity(f.size as usize);
@@ -420,6 +418,7 @@ impl Shared {

        let mut files: Vec<Found> = Vec::new();
        let mut seen = HashSet::new();
+        let mut by_dir: HashMap<PathBuf, HashSet<PathBuf>> = HashMap::new();
        for path in changed {
            if !seen.insert(path.clone()) {
                continue;
@@ -430,16 +429,19 @@ impl Shared {
            }
            if meta.is_dir() {
                files.extend(filter.walk(&path, &self.cancelled));
-            } else if meta.is_file() {
-                files.push(Found { mtime: mtime_of(&meta), size: meta.len(), path });
+            } else if meta.is_file()
+                && let Some(dir) = path.parent()
+            {
+                by_dir.entry(dir.to_owned()).or_default().insert(path);
            }
        }
+        // Listing the folder applies every ignore file (nested, global) to tell ignored files apart.
+        for (dir, wanted) in by_dir {
+            files.extend(filter.list_dir(&dir).into_iter().filter(|f| wanted.contains(&f.path)));
+        }
        let files: Vec<Found> = {
            let d = self.data.read();
-            files
-                .into_iter()
-                .filter(|f| d.get(&f.path).is_none_or(|e| e.mtime != f.mtime || e.size != f.size))
-                .collect()
+            files.into_iter().filter(|f| d.get(&f.path).is_none_or(|e| e.stale_for(f))).collect()
        };
        if !files.is_empty() {
            touched = true;
@@ -457,7 +459,7 @@ impl Shared {
                    .filter(|p| before.detect(p, None) != self.languages.detect(p, None))
                    .filter_map(|p| {
                        let e = d.get(p)?;
-                        Some(Found { path: p.clone(), mtime: e.mtime, size: e.size })
+                        Some(Found { path: p.clone(), mtime: e.mtime, size: e.size, ignored: e.ignored })
                    })
                    .collect()
            };
@@ -16,3 +16,6 @@ parking_lot.workspace = true
 thiserror.workspace = true
 tracing.workspace = true
 encoding_rs.workspace = true
+
+[dev-dependencies]
+tempfile.workspace = true
@@ -216,6 +216,9 @@ pub trait Handler: Send + Sync + 'static {
    fn on_request_with_data(&self, method: &str, params: Value) -> Result<Value, (i64, String, Option<Value>)> {
        self.on_request(method, params).map_err(|(code, message)| (code, message, None))
    }
+
+    /// Called once the response to a `method` request is queued: what it sends follows the response.
+    fn after_response(&self, _method: &str) {}
 }

 /// A [`Handler`] that ignores notifications and rejects requests.
@@ -243,6 +246,9 @@ struct Inner {
    pid: Option<u32>,
    /// Fired when the reader task has stopped (EOF, error or kill).
    reader_done: CancellationToken,
+    /// Fired once the child process has exited and been reaped (after [`Peer::kill`],
+    /// also what it started); at once when there is no child.
+    exited: CancellationToken,
 }

 impl Inner {
@@ -432,6 +438,7 @@ impl Peer {
                    (child.wait().await.ok(), true)
                }
            };
+            inner.exited.cancel();
            if !killed {
                // Bounded: a grandchild may keep the pipes open.
                let drained = async {
@@ -510,7 +517,11 @@ impl Peer {
            kill: CancellationToken::new(),
            pid,
            reader_done: CancellationToken::new(),
+            exited: CancellationToken::new(),
        });
+        if pid.is_none() {
+            inner.exited.cancel();
+        }

        // Writer: a single task drains the queue so messages never interleave.
        {
@@ -704,6 +715,13 @@ impl Peer {
        self.inner.close_transport();
        self.inner.kill.cancel();
    }
+
+    /// Resolves once the child process is gone: exited on its own, or killed with what it
+    /// started and reaped. [`closed`](Self::closed) can come earlier, at EOF. Until then the
+    /// child may still hold files open, which on Windows can't be deleted.
+    pub async fn exited(&self) {
+        self.inner.exited.cancelled().await;
+    }
 }

 /// Removes the pending entry and tells the remote side to stop when a request
@@ -740,7 +758,8 @@ enum Incoming {

 async fn handle_request(inner: Arc<Inner>, handler: Arc<dyn Handler>, id: Value, method: String, params: Value) {
    let m = method.clone();
-    let result = tokio::task::spawn_blocking(move || handler.on_request_with_data(&m, params)).await;
+    let h = handler.clone();
+    let result = tokio::task::spawn_blocking(move || h.on_request_with_data(&m, params)).await;
    let reply = match result {
        Ok(Ok(result)) => json!({ "jsonrpc": "2.0", "id": id, "result": result }),
        Ok(Err((code, message, data))) => {
@@ -755,7 +774,9 @@ async fn handle_request(inner: Arc<Inner>, handler: Arc<dyn Handler>, id: Value,
            "error": { "code": codes::INTERNAL_ERROR, "message": format!("handler for {method} panicked") }
        }),
    };
-    let _ = inner.send_value(&reply);
+    if inner.send_value(&reply).is_ok() {
+        handler.after_response(&method);
+    }
 }

 fn dispatch(inner: &Arc<Inner>, notif_tx: &std::sync::mpsc::Sender<Incoming>, body: &[u8]) {
@@ -251,6 +251,34 @@ async fn server_to_client_request() {
    assert!(matches!(err, RpcError::Server { code: codes::METHOD_NOT_FOUND, .. }));
 }

+#[tokio::test(flavor = "multi_thread")]
+async fn after_response_messages_follow_the_response() {
+    #[derive(Default)]
+    struct Client(std::sync::OnceLock<Peer>);
+    impl Handler for Client {
+        fn on_notification(&self, _: &str, _: Value) {}
+        fn on_request(&self, _: &str, _: Value) -> Result<Value, (i64, String)> {
+            Ok(json!("answer"))
+        }
+        fn after_response(&self, method: &str) {
+            self.0.get().unwrap().notify("after", method).unwrap();
+        }
+    }
+    let client = Arc::new(Client::default());
+    let (client_io, server_io) = duplex(64 * 1024);
+    let (cr, cw) = tokio::io::split(client_io);
+    assert!(client.0.set(Peer::connect(cr, cw, client.clone())).is_ok());
+    let (sr, mut sw) = tokio::io::split(server_io);
+    let request = br#"{"jsonrpc":"2.0","id":1,"method":"workspace/configuration","params":{}}"#;
+    framing::write_message(&mut sw, request).await.unwrap();
+    let mut reader = tokio::io::BufReader::new(sr);
+    let mut next = async || -> Value {
+        serde_json::from_slice(&framing::read_message(&mut reader).await.unwrap().unwrap()).unwrap()
+    };
+    assert_eq!(next().await, json!({ "jsonrpc": "2.0", "id": 1, "result": "answer" }));
+    assert_eq!(next().await, json!({ "jsonrpc": "2.0", "method": "after", "params": "workspace/configuration" }));
+}
+
 #[tokio::test(flavor = "multi_thread")]
 async fn requests_start_after_the_notifications_before_them() {
    // `seen` answers with the notifications handled so far; handling one is slow.
@@ -413,6 +441,65 @@ async fn kill_terminates_process() {
    tokio::time::timeout(Duration::from_secs(5), peer.closed()).await.unwrap();
 }

+#[cfg(unix)]
+#[tokio::test(flavor = "multi_thread")]
+async fn exited_resolves_once_the_killed_process_is_reaped() {
+    let peer =
+        Peer::spawn("sleep", &["30".into()], &std::env::temp_dir(), &[], Arc::new(NoopHandler), Box::new(|_| {}))
+            .unwrap();
+    let pid = peer.pid().unwrap().to_string();
+    let exited = tokio::time::timeout(Duration::from_millis(200), peer.exited()).await;
+    assert!(exited.is_err(), "running until killed");
+    peer.kill();
+    tokio::time::timeout(Duration::from_secs(5), peer.exited()).await.unwrap();
+    let alive = std::process::Command::new("kill").args(["-0", &pid]).status().unwrap().success();
+    assert!(!alive, "reaped, not even a zombie");
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn exited_resolves_at_once_without_a_process() {
+    let (client, _server) = pair(Arc::new(NoopHandler), Arc::new(Recorder::default()));
+    tokio::time::timeout(Duration::from_secs(1), client.exited()).await.unwrap();
+}
+
+#[cfg(windows)]
+#[tokio::test(flavor = "multi_thread")]
+async fn exited_waits_for_a_windows_descendant_to_release_its_file() {
+    use std::os::windows::fs::OpenOptionsExt;
+    let tmp = tempfile::tempdir().unwrap();
+    std::fs::write(
+        tmp.path().join("hold.ps1"),
+        "$f=[IO.File]::Open('locked.txt','Create','ReadWrite','None'); [IO.File]::WriteAllText('ready.txt','ready'); Start-Sleep 30",
+    )
+    .unwrap();
+    let peer = Peer::spawn(
+        "cmd",
+        &[
+            "/D".into(),
+            "/C".into(),
+            "powershell -NoProfile -NonInteractive -ExecutionPolicy Bypass -File hold.ps1".into(),
+        ],
+        tmp.path(),
+        &[],
+        Arc::new(NoopHandler),
+        Box::new(|_| {}),
+    )
+    .unwrap();
+    tokio::time::timeout(Duration::from_secs(10), async {
+        while !tmp.path().join("ready.txt").exists() {
+            tokio::time::sleep(Duration::from_millis(10)).await;
+        }
+    })
+    .await
+    .unwrap();
+    let open = || std::fs::OpenOptions::new().read(true).share_mode(0).open(tmp.path().join("locked.txt"));
+    assert_eq!(open().unwrap_err().raw_os_error(), Some(32));
+    assert!(tokio::time::timeout(Duration::from_millis(200), peer.exited()).await.is_err());
+    peer.kill();
+    tokio::time::timeout(Duration::from_secs(5), peer.exited()).await.unwrap();
+    drop(open().expect("exited must wait for the descendant's file handle to close"));
+}
+
 /// A launcher that prints in the system code page and exits before speaking the
 /// protocol: `jdtls.bat` on a Chinese Windows when its Python step fails, then
 /// `pause` prints `请按任意键继续. . .` in GBK on stdout.
@@ -60,6 +60,9 @@ pub struct LanguageConfig {
    /// External formatter used when no language server can format, or selected in settings.
    #[serde(default)]
    pub formatter: Option<FormatterConfig>,
+    /// Content of a new scratch file; `$END$` marks where the caret goes.
+    #[serde(default)]
+    pub scratch_template: Option<String>,
 }

 /// An external formatting tool and its language-specific parser.
@@ -152,6 +155,11 @@ pub struct LanguageServerConfig {
    /// Register source files with tsserver when no project configuration exists.
    #[serde(default)]
    pub tsserver_project: bool,
+    /// Re-sends the open documents (unchanged) once `workspace/configuration` is answered:
+    /// the server (Intelephense) applies some settings, such as the PHP version, only when
+    /// it parses a document.
+    #[serde(default)]
+    pub resync_on_configuration: bool,
    /// Set on plugin languages: start exactly this approved program.
    #[serde(skip)]
    pub pinned: Option<ProgramPin>,
@@ -242,6 +250,10 @@ pub struct LanguageInfo {
    #[serde(default)]
    #[specta(optional)]
    pub first_line: Option<String>,
+    /// Content of a new scratch file; `$END$` marks where the caret goes.
+    #[serde(default)]
+    #[specta(optional)]
+    pub scratch_template: Option<String>,
 }

 impl From<&LanguageConfig> for LanguageInfo {
@@ -258,6 +270,7 @@ impl From<&LanguageConfig> for LanguageInfo {
            language_servers: c.language_servers.iter().map(|s| s.name.clone()).collect(),
            filenames: c.filenames.clone(),
            first_line: c.first_line.clone(),
+            scratch_template: c.scratch_template.clone(),
        }
    }
 }
@@ -772,6 +772,10 @@ mod tests {
                    assert!(addr.parse::<std::net::SocketAddr>().is_ok(), "{name}: bad connect address {addr}");
                }
            }
+            if let Some(t) = &cfg.scratch_template {
+                assert_eq!(t.matches("$END$").count(), 1, "{name}: scratch-template needs one $END$");
+                assert!(!cfg.extensions.is_empty(), "{name}: scratch-template without an extension");
+            }
            for ext in &cfg.extensions {
                assert_eq!(ext, &ext.to_ascii_lowercase(), "{name}: extensions must be lower case");
                assert!(!ext.starts_with('.'), "{name}: extension {ext} must not start with a dot");
@@ -37,7 +37,7 @@ pub fn client_capabilities() -> Value {
            "fileOperations": { "dynamicRegistration": true, "willRename": true, "didRename": true },
            "configuration": true,
            "didChangeConfiguration": { "dynamicRegistration": false },
-            "didChangeWatchedFiles": { "dynamicRegistration": false, "relativePatternSupport": false },
+            "didChangeWatchedFiles": { "dynamicRegistration": true, "relativePatternSupport": true },
            "symbol": {
                "dynamicRegistration": false,
                "symbolKind": { "valueSet": symbol_kinds },
@@ -48,7 +48,7 @@ pub fn client_capabilities() -> Value {
            "semanticTokens": { "refreshSupport": true },
            "codeLens": { "refreshSupport": true },
            "inlayHint": { "refreshSupport": true },
-            "diagnostics": { "refreshSupport": false },
+            "diagnostics": { "refreshSupport": true },
            "textDocumentContent": { "dynamicRegistration": true }
        },
        "textDocument": {
@@ -130,6 +130,7 @@ pub fn client_capabilities() -> Value {
                "prepareSupportDefaultBehavior": 1,
                "honorsChangeAnnotations": false
            },
+            "diagnostic": { "dynamicRegistration": false, "relatedDocumentSupport": false },
            "publishDiagnostics": {
                "relatedInformation": true,
                "tagSupport": { "valueSet": [1, 2] },
@@ -59,7 +59,7 @@ fn source_files(root: &Path, exclude_root: &Path, excludes: Vec<String>, limit:
    }
    let Ok(ignores) = ignores.build() else { return Vec::new() };
    let mut walk = ignore::WalkBuilder::new(root);
-    walk.require_git(false).follow_links(false).filter_entry(move |entry| {
+    walk.require_git(ide_core::ignored::inside_git_repo(root)).follow_links(false).filter_entry(move |entry| {
        if entry.depth() == 0 {
            return true;
        }
@@ -0,0 +1,150 @@
+//! `workspace/didChangeWatchedFiles` registrations: which changes on disk a
+//! server asked to hear of (its globs, relative patterns and change kinds).
+
+use crate::uri;
+use globset::{GlobBuilder, GlobMatcher};
+use serde_json::Value;
+use std::collections::BTreeMap;
+use std::path::{Path, PathBuf};
+
+/// `FileChangeType`.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum Change {
+    Created = 1,
+    Changed = 2,
+    Deleted = 3,
+}
+
+impl Change {
+    /// The `WatchKind` bit.
+    fn kind_bit(self) -> u64 {
+        match self {
+            Self::Created => 1,
+            Self::Changed => 2,
+            Self::Deleted => 4,
+        }
+    }
+}
+
+struct Watcher {
+    /// Relative pattern's base; `None` for a plain glob, matched below the server's root.
+    base: Option<PathBuf>,
+    /// A plain glob that is an absolute path pattern.
+    absolute: bool,
+    glob: GlobMatcher,
+    kind: u64,
+}
+
+/// A server's registrations, by registration id.
+#[derive(Default)]
+pub struct FileWatchers(BTreeMap<String, Vec<Watcher>>);
+
+impl FileWatchers {
+    pub fn register(&mut self, id: &str, options: Option<&Value>) {
+        let watchers = options
+            .and_then(|o| o.get("watchers"))
+            .and_then(Value::as_array)
+            .into_iter()
+            .flatten()
+            .filter_map(parse)
+            .collect();
+        self.0.insert(id.to_owned(), watchers);
+    }
+
+    pub fn unregister(&mut self, id: &str) {
+        self.0.remove(id);
+    }
+
+    pub fn is_empty(&self) -> bool {
+        self.0.is_empty()
+    }
+
+    /// Whether a server rooted at `root` wants to hear of `change` to `path`.
+    pub fn wants(&self, root: &Path, path: &Path, change: Change) -> bool {
+        self.0.values().flatten().any(|w| {
+            if w.kind & change.kind_bit() == 0 {
+                return false;
+            }
+            match &w.base {
+                Some(base) => path.strip_prefix(base).is_ok_and(|rel| w.glob.is_match(rel)),
+                None if w.absolute => w.glob.is_match(path),
+                None => path.strip_prefix(root).is_ok_and(|rel| w.glob.is_match(rel)),
+            }
+        })
+    }
+
+    /// Bases of relative patterns, which may lie outside the project (a virtualenv's
+    /// `site-packages`, a path dependency): the client watches them for the server.
+    pub fn bases(&self) -> impl Iterator<Item = &Path> {
+        self.0.values().flatten().filter_map(|w| w.base.as_deref())
+    }
+}
+
+fn parse(watcher: &Value) -> Option<Watcher> {
+    let kind = watcher.get("kind").and_then(Value::as_u64).unwrap_or(7);
+    let (base, pattern) = match watcher.get("globPattern")? {
+        Value::String(p) => (None, p.as_str()),
+        relative => {
+            let base = relative.get("baseUri")?;
+            // A `WorkspaceFolder` or a URI.
+            let base = base.get("uri").unwrap_or(base).as_str()?;
+            let base = uri::uri_to_path(base)?;
+            // Changes are reported for canonical paths (`/tmp` is `/private/tmp` on macOS).
+            (Some(dunce::canonicalize(&base).unwrap_or(base)), relative.get("pattern")?.as_str()?)
+        }
+    };
+    let glob = GlobBuilder::new(pattern).literal_separator(true).build().ok()?.compile_matcher();
+    let absolute = base.is_none() && Path::new(pattern).is_absolute();
+    Some(Watcher { base, absolute, glob, kind })
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use serde_json::json;
+
+    fn watchers(list: Value) -> FileWatchers {
+        let mut w = FileWatchers::default();
+        w.register("1", Some(&json!({ "watchers": list })));
+        w
+    }
+
+    #[test]
+    fn matches_globs_relative_patterns_and_kinds() {
+        let root = Path::new("/p");
+        let venv = uri::path_to_uri(Path::new("/opt/venv/lib/site-packages"));
+        let w = watchers(json!([
+            { "globPattern": "**/*.{go,mod,sum}" },
+            { "globPattern": "**/pyrightconfig.json", "kind": 2 },
+            { "globPattern": { "baseUri": venv, "pattern": "**" } },
+            { "globPattern": { "baseUri": { "uri": uri::path_to_uri(Path::new("/shared")), "name": "s" }, "pattern": "*.toml" } },
+        ]));
+        let cases = [
+            ("/p/go.mod", Change::Changed, true),
+            ("/p/sub/main.go", Change::Created, true),
+            ("/elsewhere/main.go", Change::Created, false),
+            ("/p/pyrightconfig.json", Change::Changed, true),
+            ("/p/pyrightconfig.json", Change::Created, false),
+            ("/opt/venv/lib/site-packages/idna/__init__.py", Change::Created, true),
+            ("/opt/venv/lib/site-packages", Change::Deleted, true),
+            ("/shared/Cargo.toml", Change::Changed, true),
+            ("/shared/nested/Cargo.toml", Change::Changed, false),
+            ("/p/readme.md", Change::Changed, false),
+        ];
+        for (path, change, expected) in cases {
+            assert_eq!(w.wants(root, Path::new(path), change), expected, "{path} {change:?}");
+        }
+        let mut bases: Vec<_> = w.bases().collect();
+        bases.sort();
+        assert_eq!(bases, [Path::new("/opt/venv/lib/site-packages"), Path::new("/shared")]);
+    }
+
+    #[test]
+    fn unregistering_drops_the_watchers() {
+        let mut w = watchers(json!([{ "globPattern": "**" }]));
+        assert!(w.wants(Path::new("/p"), Path::new("/p/a"), Change::Created));
+        w.unregister("1");
+        assert!(w.is_empty());
+        assert!(!w.wants(Path::new("/p"), Path::new("/p/a"), Change::Created));
+    }
+}
@@ -130,15 +130,8 @@ impl ClientHandler {
        {
            return;
        }
-        let conv = mgr.conv(self.encoding());
-        let items = params
-            .diagnostics
-            .iter()
-            .cloned()
-            .map(|d| convert::diagnostic(&conv, &path, d, &self.server.name))
-            .collect();
-        self.server.set_diagnostics(path.clone(), params.diagnostics);
-        mgr.sink().emit(IdeEvent::Diagnostics { path: path.into(), source: self.server.name.clone(), items });
+        let shown = self.server.set_diagnostics(path.clone(), params.diagnostics);
+        mgr.emit_diagnostics(&self.server, path, shown, self.encoding());
    }

    fn show_message(&self, mgr: &LspManager, params: &Value) {
@@ -206,19 +199,33 @@ impl ClientHandler {
        Ok(reply)
    }

-    fn registration(&self, params: &Value, register: bool) {
-        let Some(run) = self.server.running_gen(self.generation) else { return };
+    fn registration(&self, mgr: &LspManager, params: &Value, register: bool) {
+        let Some(run) = self.server.initialized_gen(self.generation) else { return };
        let key = if register { "registrations" } else { "unregisterations" };
        let list = params.get(key).or_else(|| params.get("unregistrations")).and_then(Value::as_array);
        let mut caps = run.caps.write();
+        let mut watchers_changed = false;
        for reg in list.into_iter().flatten() {
            let Some(method) = reg.get("method").and_then(Value::as_str) else { continue };
-            if register {
+            if method == "workspace/didChangeWatchedFiles" {
+                let id = reg.get("id").and_then(Value::as_str).unwrap_or_default();
+                let mut watchers = run.watchers.write();
+                if register {
+                    watchers.register(id, reg.get("registerOptions"));
+                } else {
+                    watchers.unregister(id);
+                }
+                watchers_changed = true;
+            } else if register {
                caps.register(method, reg.get("registerOptions"));
            } else {
                caps.unregister(method);
            }
        }
+        drop(caps);
+        if watchers_changed {
+            mgr.file_watch_roots_changed();
+        }
    }
 }

@@ -278,11 +285,11 @@ impl Handler for ClientHandler {
            "workspace/configuration" => Ok(self.configuration(&params)),
            "workspace/workspaceFolders" => Ok(mgr.workspace_folders(&self.server)),
            "client/registerCapability" => {
-                self.registration(&params, true);
+                self.registration(&mgr, &params, true);
                Ok(Value::Null)
            }
            "client/unregisterCapability" => {
-                self.registration(&params, false);
+                self.registration(&mgr, &params, false);
                Ok(Value::Null)
            }
            "workspace/applyEdit" => self.apply_edit(&mgr, params),
@@ -295,10 +302,23 @@ impl Handler for ClientHandler {
                mgr.sink().emit(IdeEvent::LspRefresh { server: self.server.id, kind });
                Ok(Value::Null)
            }
-            "workspace/diagnostic/refresh" | "workspace/inlineValue/refresh" => Ok(Value::Null),
+            "workspace/diagnostic/refresh" => {
+                mgr.refresh_pulled_diagnostics(&self.server);
+                Ok(Value::Null)
+            }
+            "workspace/inlineValue/refresh" => Ok(Value::Null),
            other => Err((codes::METHOD_NOT_FOUND, format!("unsupported method {other}"))),
        }
    }
+
+    fn after_response(&self, method: &str) {
+        if method == "workspace/configuration"
+            && self.server.config.resync_on_configuration
+            && let Some(mgr) = self.mgr.upgrade()
+        {
+            mgr.resync_documents(&self.server, self.generation);
+        }
+    }
 }

 /// What `workspace/configuration` sections are looked up in: the server's
@@ -6,8 +6,6 @@
 //! (`textDocument/diagnostic`). The others are waited on: the first
 //! `publishDiagnostics` for the file after it was opened, then a short quiet
 //! period so follow-up publishes (syntax first, semantics later) are caught.
-//! The client never advertises pull support, so servers keep pushing for the
-//! editor as before.

 use crate::convert;
 use crate::server::Server;
@@ -1,5 +1,5 @@
 //! Pull Members Up / Push Members Down through the app-owned JDT extension
-//! (`plugins/java-usages`). The server checks the move and computes the edit; the UI
+//! (`java/java-usages`). The server checks the move and computes the edit; the UI
 //! shows its problems and applies the edit itself.
 use super::COMMAND_TIMEOUT;
 use crate::types::{HierarchyChoice, HierarchyMembers, HierarchyRefactored, HierarchyRefactoring, RefactoringProblem};
@@ -12,15 +12,18 @@ mod clang_tidy;
 mod convert;
 mod external_project;
 mod file_ops;
+mod file_watch;
 mod handler;
 mod inspect;
 pub mod jdtls;
 mod launch;
 mod library_source;
+mod pull;
 mod scope;
 mod server;
 mod tcp;
 mod text;
+mod ts_file_moves;
 mod tsserver_bridge;
 pub mod types;
 mod uri;
@@ -160,6 +163,9 @@ impl DocSnap {
    }
 }

+/// Receives the folders outside the project that servers want watched.
+pub type WatchRootsFn = dyn Fn(Vec<PathBuf>) + Send + Sync;
+
 pub struct LspManager {
    me: Weak<LspManager>,
    project_root: PathBuf,
@@ -177,6 +183,7 @@ pub struct LspManager {
    servers_hook: RwLock<Option<Arc<ServersFn>>>,
    candidates_hook: RwLock<Option<Arc<CandidateFn>>>,
    excludes_hook: RwLock<Option<Arc<external_project::ExcludesFn>>>,
+    watch_roots_hook: RwLock<Option<Arc<WatchRootsFn>>>,
    shutting_down: AtomicBool,
    execution_allowed: AtomicBool,
    java_usages_warned: AtomicBool,
@@ -336,6 +343,7 @@ impl LspManager {
            servers_hook: RwLock::new(None),
            candidates_hook: RwLock::new(None),
            excludes_hook: RwLock::new(None),
+            watch_roots_hook: RwLock::new(None),
            shutting_down: AtomicBool::new(false),
            execution_allowed: AtomicBool::new(true),
            java_usages_warned: AtomicBool::new(false),
@@ -426,6 +434,7 @@ impl LspManager {
        let wanted: Vec<(DocId, Vec<Arc<Server>>)> =
            open.into_iter().map(|(id, language, path)| (id, self.servers_for(&language, &path))).collect();
        let mut start = Vec::new();
+        let mut opened = Vec::new();
        {
            let mut docs = self.docs.lock();
            for (id, servers) in wanted {
@@ -440,6 +449,7 @@ impl LspManager {
                            user_did_open(server, &run, &d.path, &d.uri, d.did_open_params());
                        }
                        attached.opened_gen = Some(run.generation);
+                        opened.push((id, server.clone()));
                    }
                    d.servers.push(attached);
                    if !start.iter().any(|s: &Arc<Server>| s.id == server.id) {
@@ -450,6 +460,9 @@ impl LspManager {
                d.servers.sort_by_key(|a| servers.iter().position(|s| s.id == a.server.id).unwrap_or(usize::MAX));
            }
        }
+        for (doc, server) in opened {
+            self.schedule_pull(doc, Some(&server), Duration::ZERO);
+        }
        for server in &start {
            self.ensure_started(server);
        }
@@ -587,6 +600,9 @@ impl LspManager {
                return;
            }
        };
+        let run =
+            Running { generation, peer: peer.clone(), caps: Arc::new(RwLock::new(caps)), watchers: Default::default() };
+        server.set_initializing(Some(run.clone()));
        if let Err(e) = peer.notify("initialized", json!({})) {
            tracing::warn!("{}: {e}", server.name);
        }
@@ -598,29 +614,34 @@ impl LspManager {
        {
            tracing::debug!("{}: didChangeConfiguration: {e}", server.name);
        }
-        let run = Running { generation, peer: peer.clone(), caps: Arc::new(RwLock::new(caps)) };

        self.refresh_external_project(&server, &run).await;

        // Publish readiness and (re)open attached documents atomically w.r.t. did_change.
+        let mut reopened = Vec::new();
        {
            let mut docs = self.docs.lock();
            if !server.mark_ready(generation, run.clone()) {
                drop(docs);
+                server.set_initializing(None);
                peer.kill();
                return;
            }
            let open_close = run.caps.read().open_close;
-            for d in docs.values_mut() {
+            for (id, d) in docs.iter_mut() {
                let params = d.did_open_params();
                for a in d.servers.iter_mut().filter(|a| a.server.id == server.id && a.opened_gen != Some(generation)) {
                    if open_close && let Err(e) = peer.notify("textDocument/didOpen", params.clone()) {
                        tracing::debug!("{}: didOpen: {e}", server.name);
                    }
                    a.opened_gen = Some(generation);
+                    reopened.push(*id);
                }
            }
        }
+        for doc in reopened {
+            self.schedule_pull(doc, Some(&server), Duration::ZERO);
+        }
        self.check_clang_tidy(&server).await;
        server.refresh_busy_status(&self.sink);
        server.announce_ready(generation);
@@ -644,6 +665,7 @@ impl LspManager {
            None => return, // superseded instance
        };
        self.clear_server_state(&server);
+        self.file_watch_roots_changed();
        if intentional {
            server.announce_down();
            return;
@@ -843,6 +865,7 @@ impl LspManager {
            }
            docs.insert(doc, state);
        }
+        self.schedule_pull(doc, None, Duration::ZERO);
        for s in &servers {
            self.ensure_started(s);
            if s.running().is_some()
@@ -920,6 +943,30 @@ impl LspManager {
                tracing::debug!("{}: didChange: {e}", server.name);
            }
        }
+        drop(docs);
+        self.schedule_pull(doc, None, pull::AFTER_EDIT);
+    }
+
+    /// Sends the documents open on instance `generation` of `server` again, as a `didChange`
+    /// with their unchanged text, so the server parses them with the settings it just read.
+    pub(crate) fn resync_documents(&self, server: &Server, generation: u64) {
+        let Some(run) = server.running_gen(generation) else { return };
+        if run.caps.read().sync == SyncKind::None {
+            return;
+        }
+        let docs = self.docs.lock();
+        for d in docs.values() {
+            if !d.servers.iter().any(|a| a.server.id == server.id && a.opened_gen == Some(generation)) {
+                continue;
+            }
+            let params = json!({
+                "textDocument": { "uri": d.uri, "version": d.version },
+                "contentChanges": [{ "text": d.text.as_str() }],
+            });
+            if let Err(e) = run.peer.notify("textDocument/didChange", params) {
+                tracing::debug!("{}: didChange: {e}", server.name);
+            }
+        }
    }

    pub fn did_save(&self, doc: DocId, text: &str) {
@@ -942,11 +989,15 @@ impl LspManager {
                tracing::debug!("{}: didSave: {e}", a.server.name);
            }
        }
+        drop(docs);
+        self.schedule_pull(doc, None, Duration::ZERO);
+        self.pull_dependents(doc);
    }

    pub fn did_close(&self, doc: DocId) {
        let Some(d) = self.docs.lock().remove(&doc) else { return };
        for a in &d.servers {
+            self.forget_pulled(&a.server, &d.path, a.server.running().as_ref());
            let Some(run) = a.server.running() else { continue };
            if a.opened_gen == Some(run.generation)
                && run.caps.read().open_close
@@ -1642,6 +1693,20 @@ impl LspManager {
        Ok(())
    }

+    /// Whether a server of `doc` (`server`, when given) provides the command `name`. Code actions
+    /// can carry commands other editors' extensions run themselves after the edit (vtsls'
+    /// `_typescript.didOrganizeImports`): no server provides those.
+    pub async fn provides_command(&self, doc: DocId, server: Option<ide_core::ServerId>, name: &str) -> bool {
+        let servers = match self.snapshot(doc) {
+            Ok(snap) => snap.servers,
+            Err(_) => self.servers.lock().clone(),
+        };
+        self.ready_targets(&servers, |c| c.commands().iter().any(|c| c == name))
+            .await
+            .iter()
+            .any(|t| server.is_none_or(|s| t.server.id == s))
+    }
+
    async fn command_target(&self, doc: DocId, server: ide_core::ServerId, name: &str) -> IdeResult<Target> {
        let snap = self.snapshot(doc)?;
        self.ready_targets(&snap.servers, |c| c.commands().iter().any(|c| c == name))
@@ -1660,6 +1725,10 @@ impl LspManager {
        answers: Vec<FormAnswer>,
        cancel: CancellationToken,
    ) -> IdeResult<Option<CommandForm>> {
+        // Nothing to ask for a command its server doesn't provide (executing it decides).
+        if !self.provides_command(doc, Some(server), &command.command).await {
+            return Ok(None);
+        }
        let t = self.command_target(doc, server, &command.command).await?;
        let interactive = t.server.name == "gopls"
            && t.caps()
@@ -1942,7 +2011,30 @@ impl LspManager {
            servers.iter().zip(ready).filter_map(|(s, run)| Some(Target { server: s.clone(), run: run? })).collect();
        let mut out = FileRenameEdits::default();
        for t in targets {
-            let Some(params) = Self::file_op_params(&t, "willRename", &moves) else { continue };
+            let Some(params) = Self::file_op_params(&t, "willRename", &moves) else {
+                if t.server.config.tsserver_project && t.caps().commands().iter().any(|c| c == ts_file_moves::COMMAND) {
+                    out.servers.push(t.server.name.clone());
+                    let opened = self.open_for_file_op(&t, &moves);
+                    for (from, to, _) in &moves {
+                        let r: IdeResult<Value> = self
+                            .call(
+                                &t,
+                                "workspace/executeCommand",
+                                ts_file_moves::request(from, to),
+                                Some(&cancel),
+                                LONG_TIMEOUT,
+                            )
+                            .await;
+                        match r {
+                            Ok(result) => out.edit.files.extend(ts_file_moves::edit(&result).files),
+                            Err(e) if e.kind == ErrorKind::Cancelled && cancel.is_cancelled() => return Err(e),
+                            Err(e) => out.errors.push(e.message),
+                        }
+                    }
+                    drop(opened);
+                }
+                continue;
+            };
            out.servers.push(t.server.name.clone());
            let opened = self.open_for_file_op(&t, &moves);
            let r: IdeResult<Option<lsp::WorkspaceEdit>> =
@@ -1973,29 +2065,78 @@ impl LspManager {
        }
    }

-    /// Files that changed on disk, outside the editor too (a checkout, another tool): each running
-    /// server hears of those of its languages under its root through `workspace/didChangeWatchedFiles`.
-    /// Without it jdtls's incremental build never sees them, so a launch runs stale classes.
-    pub fn watched_files_changed(&self, created: &[PathBuf], modified: &[PathBuf], removed: &[PathBuf]) {
+    /// Files that changed on disk, outside the editor too (a checkout, another tool), sent to
+    /// running servers through `workspace/didChangeWatchedFiles`. A server that registered file
+    /// watchers hears of what they match, including `excluded_dirs` (folders in excluded or
+    /// ignored trees whose entries came or went, reported as created): a package installed
+    /// into `.venv` or a `go.mod` rewritten by `go get` is picked up without a restart. Other
+    /// servers hear of their languages' files under their root; without it jdtls's incremental
+    /// build never sees them, so a launch runs stale classes.
+    pub fn watched_files_changed(
+        &self,
+        created: &[PathBuf],
+        modified: &[PathBuf],
+        removed: &[PathBuf],
+        excluded_dirs: &[PathBuf],
+    ) {
+        use file_watch::Change;
        let servers: Vec<Arc<Server>> = self.servers.lock().clone();
        for s in servers {
            let Some(run) = s.running() else { continue };
-            let languages = s.languages();
-            let changes: Vec<Value> = [(created, 1), (modified, 2), (removed, 3)]
+            let all = [(created, Change::Created), (modified, Change::Changed), (removed, Change::Deleted)]
                .into_iter()
-                .flat_map(|(paths, kind)| paths.iter().map(move |p| (p, kind)))
-                .filter(|(p, _)| p.starts_with(&s.root) && languages.contains(&self.languages.detect(p, None)))
-                .map(|(p, kind)| json!({ "uri": uri::path_to_uri(p), "type": kind }))
-                .collect();
+                .flat_map(|(paths, change)| paths.iter().map(move |p| (p, change)));
+            let watchers = run.watchers.read();
+            let changes: Vec<(&PathBuf, Change)> = if watchers.is_empty() {
+                let languages = s.languages();
+                all.filter(|(p, _)| p.starts_with(&s.root) && languages.contains(&self.languages.detect(p, None)))
+                    .collect()
+            } else {
+                all.chain(excluded_dirs.iter().map(|p| (p, Change::Created)))
+                    .filter(|(p, change)| watchers.wants(&s.root, p, *change))
+                    .collect()
+            };
+            drop(watchers);
            if changes.is_empty() {
                continue;
            }
+            let changes: Vec<Value> =
+                changes.iter().map(|(p, c)| json!({ "uri": uri::path_to_uri(p), "type": *c as u8 })).collect();
            if let Err(e) = run.peer.notify("workspace/didChangeWatchedFiles", json!({ "changes": changes })) {
                tracing::debug!("{}: didChangeWatchedFiles: {e}", s.name);
            }
        }
    }

+    /// Called with the folders outside the project that servers registered file watchers
+    /// for (a virtualenv elsewhere, a path dependency), whenever they change. Changes
+    /// below them go to [`Self::watched_files_changed`].
+    pub fn set_file_watch_roots_hook(&self, hook: Box<WatchRootsFn>) {
+        *self.watch_roots_hook.write() = Some(Arc::from(hook));
+        self.file_watch_roots_changed();
+    }
+
+    pub(crate) fn file_watch_roots_changed(&self) {
+        let Some(hook) = self.watch_roots_hook.read().clone() else { return };
+        let servers: Vec<Arc<Server>> = self.servers.lock().clone();
+        let mut roots: Vec<PathBuf> = Vec::new();
+        for run in servers.iter().filter_map(|s| s.instance()) {
+            roots.extend(
+                run.watchers.read().bases().filter(|b| !b.starts_with(&self.project_root)).map(Path::to_path_buf),
+            );
+        }
+        roots.sort();
+        roots.dedup();
+        // Sorted, so a folder's subfolders follow it.
+        let mut outer: Vec<PathBuf> = Vec::new();
+        for r in roots {
+            if !outer.last().is_some_and(|o| r.starts_with(o)) {
+                outer.push(r);
+            }
+        }
+        hook(outer);
+    }
+
    /// Checks initialized capabilities, including dynamic registrations, before choosing a formatter.
    pub async fn can_format(&self, doc: DocId) -> IdeResult<bool> {
        let snap = self.snapshot(doc)?;
@@ -2451,6 +2592,12 @@ impl LspManager {
        }
    }

+    /// [`Self::reconfigure`] on the manager's runtime, for callers outside one (file watchers).
+    pub fn reconfigure_soon(self: &Arc<Self>) {
+        let me = self.clone();
+        self.runtime.spawn(async move { me.reconfigure().await });
+    }
+
    pub async fn reconfigure(&self) {
        if !self.execution_allowed.load(Ordering::Acquire) {
            let servers = self.servers.lock().clone();
@@ -0,0 +1,192 @@
+//! Pull diagnostics (`textDocument/diagnostic`). Servers that provide them may stop pushing
+//! their own analysis to a client that can pull (rust-analyzer pushes only `cargo check`
+//! then): the editor pulls an open file's diagnostics when it opens, after edits and saves,
+//! and when the server asks for a refresh. Pulled diagnostics are kept apart from pushed ones
+//! and shown together.
+
+use crate::server::{Running, Server};
+use crate::{LspManager, convert};
+use ide_core::{DocId, IdeEvent};
+use ide_jsonrpc::RpcError;
+use lsp_types as lsp;
+use serde_json::{Value, json};
+use std::path::PathBuf;
+use std::sync::Arc;
+use std::time::Duration;
+
+/// How long typing must pause before a changed file is pulled again.
+pub(crate) const AFTER_EDIT: Duration = Duration::from_millis(300);
+const TIMEOUT: Duration = Duration::from_secs(30);
+/// Retries of a pull the server cancelled (`ServerCancelled`, e.g. while indexing).
+const RETRIES: u32 = 20;
+
+struct PullTarget {
+    server: Arc<Server>,
+    run: Running,
+    path: PathBuf,
+    uri: lsp::Uri,
+}
+
+fn provides_pull(run: &Running) -> bool {
+    let caps = run.caps.read();
+    caps.restriction.diagnostics() && caps.has("diagnosticProvider")
+}
+
+fn inter_file(run: &Running) -> bool {
+    run.caps.read().raw.pointer("/diagnosticProvider/interFileDependencies").and_then(Value::as_bool) == Some(true)
+}
+
+impl LspManager {
+    /// Pulls `doc`'s diagnostics from its servers that provide them (`only`: from that one)
+    /// after `delay`; a later pull of the same file supersedes it.
+    pub(crate) fn schedule_pull(&self, doc: DocId, only: Option<&Server>, delay: Duration) {
+        let targets: Vec<PullTarget> = {
+            let docs = self.docs.lock();
+            let Some(d) = docs.get(&doc) else { return };
+            d.servers
+                .iter()
+                .filter(|a| only.is_none_or(|s| s.id == a.server.id))
+                .filter_map(|a| {
+                    let run = a.server.running()?;
+                    (a.opened_gen == Some(run.generation) && provides_pull(&run)).then(|| PullTarget {
+                        server: a.server.clone(),
+                        run,
+                        path: d.path.clone(),
+                        uri: d.uri.clone(),
+                    })
+                })
+                .collect()
+        };
+        for t in targets {
+            if t.server.suppresses_diagnostics(&t.path) {
+                continue;
+            }
+            let pull = t.server.next_pull(&t.path);
+            let me = self.me.clone();
+            self.runtime.spawn(async move {
+                tokio::time::sleep(delay).await;
+                if let Some(me) = me.upgrade() {
+                    me.pull(t, pull).await;
+                }
+            });
+        }
+    }
+
+    /// Pulls every open file of `server` again (`workspace/diagnostic/refresh`).
+    pub(crate) fn refresh_pulled_diagnostics(&self, server: &Server) {
+        let docs: Vec<DocId> = self
+            .docs
+            .lock()
+            .iter()
+            .filter(|(_, d)| d.servers.iter().any(|a| a.server.id == server.id))
+            .map(|(id, _)| *id)
+            .collect();
+        for doc in docs {
+            self.schedule_pull(doc, Some(server), Duration::ZERO);
+        }
+    }
+
+    /// After `doc` was saved: servers whose diagnostics depend on other files pull those
+    /// open files too.
+    pub(crate) fn pull_dependents(&self, doc: DocId) {
+        let docs = self.docs.lock();
+        let Some(d) = docs.get(&doc) else { return };
+        let servers: Vec<Arc<Server>> = d
+            .servers
+            .iter()
+            .filter(|a| a.server.running().is_some_and(|run| provides_pull(&run) && inter_file(&run)))
+            .map(|a| a.server.clone())
+            .collect();
+        let others: Vec<(DocId, Vec<Arc<Server>>)> = docs
+            .iter()
+            .filter(|(id, _)| **id != doc)
+            .map(|(id, o)| {
+                (*id, servers.iter().filter(|s| o.servers.iter().any(|a| a.server.id == s.id)).cloned().collect())
+            })
+            .collect();
+        drop(docs);
+        for (other, servers) in others {
+            for server in servers {
+                self.schedule_pull(other, Some(&server), Duration::ZERO);
+            }
+        }
+    }
+
+    /// Drops what was pulled for a closed file and shows what remains.
+    pub(crate) fn forget_pulled(&self, server: &Server, path: &std::path::Path, run: Option<&Running>) {
+        if let Some(shown) = server.clear_pulled(path) {
+            let enc = run.map(|r| r.caps.read().encoding).unwrap_or_default();
+            self.emit_diagnostics(server, path.to_owned(), shown, enc);
+        }
+    }
+
+    async fn pull(&self, t: PullTarget, pull: u64) {
+        let mut attempt = 0;
+        loop {
+            if !t.server.is_latest_pull(&t.path, pull) {
+                return;
+            }
+            let mut params = json!({ "textDocument": { "uri": t.uri } });
+            if let Some(id) = t.server.pulled_result_id(&t.path) {
+                params["previousResultId"] = json!(id);
+            }
+            if let Some(identifier) = t.run.caps.read().raw.pointer("/diagnosticProvider/identifier") {
+                params["identifier"] = identifier.clone();
+            }
+            let request = t.run.peer.request::<Value, Value>("textDocument/diagnostic", params, None);
+            let report = match tokio::time::timeout(TIMEOUT, request).await {
+                Ok(Ok(report)) => report,
+                // This request has no cancellation of its own: the server cancelled it
+                // (`ServerCancelled` while busy, which asks to be asked again).
+                Ok(Err(RpcError::Cancelled)) if attempt < RETRIES => {
+                    attempt += 1;
+                    tokio::time::sleep(Duration::from_millis(250 * u64::from(attempt.min(8)))).await;
+                    continue;
+                }
+                Ok(Err(e)) => {
+                    tracing::debug!("{}: textDocument/diagnostic: {e}", t.server.name);
+                    return;
+                }
+                Err(_) => {
+                    tracing::debug!("{}: textDocument/diagnostic timed out", t.server.name);
+                    return;
+                }
+            };
+            // A newer pull, a closed file or a restarted server makes this report stale.
+            if !t.server.is_latest_pull(&t.path, pull)
+                || t.server.running().is_none_or(|r| r.generation != t.run.generation)
+                || !self.docs.lock().values().any(|d| d.path == t.path)
+            {
+                return;
+            }
+            let result_id = report.get("resultId").and_then(Value::as_str).map(str::to_owned);
+            let items = match report.get("kind").and_then(Value::as_str) {
+                Some("unchanged") => None,
+                _ => match serde_json::from_value(report.get("items").cloned().unwrap_or(json!([]))) {
+                    Ok(items) => Some(items),
+                    Err(e) => {
+                        tracing::debug!("{}: bad textDocument/diagnostic report: {e}", t.server.name);
+                        return;
+                    }
+                },
+            };
+            let shown = t.server.set_pulled(t.path.clone(), result_id, items);
+            let enc = t.run.caps.read().encoding;
+            self.emit_diagnostics(&t.server, t.path, shown, enc);
+            return;
+        }
+    }
+
+    /// Shows `items` as `server`'s diagnostics for `path`.
+    pub(crate) fn emit_diagnostics(
+        &self,
+        server: &Server,
+        path: PathBuf,
+        items: Vec<lsp::Diagnostic>,
+        enc: crate::text::Encoding,
+    ) {
+        let conv = self.conv(enc);
+        let items = items.into_iter().map(|d| convert::diagnostic(&conv, &path, d, &server.name)).collect();
+        self.sink.emit(IdeEvent::Diagnostics { path: path.into(), source: server.name.clone(), items });
+    }
+}
@@ -27,6 +27,8 @@ pub struct Running {
    pub generation: u64,
    pub peer: Peer,
    pub caps: Arc<RwLock<ServerCaps>>,
+    /// `workspace/didChangeWatchedFiles` registrations.
+    pub watchers: Arc<RwLock<crate::file_watch::FileWatchers>>,
 }

 pub enum Conn {
@@ -82,6 +84,9 @@ pub struct Server {
    pub resolved_binary: RwLock<Option<PathBuf>>,
    languages: Mutex<Vec<LanguageId>>,
    state: Mutex<State>,
+    /// The instance being initialized, from `initialized` until ready: registrations
+    /// sent right after `initialized` must not be lost.
+    initializing: Mutex<Option<Running>>,
    /// Fired when the instance being started is abandoned (stop / restart while starting).
    start_cancel: Mutex<CancellationToken>,
    phase: watch::Sender<Phase>,
@@ -92,7 +97,13 @@ pub struct Server {
    started: Mutex<Option<Instant>>,
    stderr: Mutex<VecDeque<String>>,
    pub progress: Mutex<HashMap<String, Progress>>,
+    /// What the editor shows per path: the pushed and the pulled diagnostics together.
    diagnostics: Mutex<HashMap<PathBuf, Vec<lsp::Diagnostic>>>,
+    /// `publishDiagnostics` per path.
+    pushed: Mutex<HashMap<PathBuf, Vec<lsp::Diagnostic>>>,
+    /// `textDocument/diagnostic` reports per path, and the latest pull asked for each.
+    pulled: Mutex<HashMap<PathBuf, Pulled>>,
+    pulls: Mutex<HashMap<PathBuf, u64>>,
    /// When diagnostics were last published per path (empty lists included).
    published: Mutex<HashMap<PathBuf, Instant>>,
    /// Woken on every `publishDiagnostics` (Inspect Code waits on it).
@@ -118,6 +129,7 @@ impl Server {
            resolved_binary: RwLock::new(None),
            languages: Mutex::new(vec![language]),
            state: Mutex::new(State { generation: 0, conn: Conn::Idle }),
+            initializing: Mutex::new(None),
            start_cancel: Mutex::new(CancellationToken::new()),
            phase: watch::channel(Phase::Down).0,
            status: Mutex::new((ServerStatus::Stopped, None)),
@@ -126,6 +138,9 @@ impl Server {
            stderr: Mutex::new(VecDeque::new()),
            progress: Mutex::new(HashMap::new()),
            diagnostics: Mutex::new(HashMap::new()),
+            pushed: Mutex::new(HashMap::new()),
+            pulled: Mutex::new(HashMap::new()),
+            pulls: Mutex::new(HashMap::new()),
            published: Mutex::new(HashMap::new()),
            published_notify: Notify::new(),
            idle_notify: Notify::new(),
@@ -210,6 +225,8 @@ impl Server {
            return false;
        }
        st.conn = Conn::Ready(run);
+        drop(st);
+        self.set_initializing(None);
        true
    }

@@ -234,6 +251,20 @@ impl Server {
        }
    }

+    /// The instance told `initialized`, ready or not.
+    pub fn instance(&self) -> Option<Running> {
+        self.running().or_else(|| self.initializing.lock().clone())
+    }
+
+    /// Generation `generation` once it was told `initialized`, ready or not.
+    pub fn initialized_gen(&self, generation: u64) -> Option<Running> {
+        self.instance().filter(|r| r.generation == generation)
+    }
+
+    pub fn set_initializing(&self, run: Option<Running>) {
+        *self.initializing.lock() = run;
+    }
+
    /// The running instance if it is still generation `generation`.
    pub fn running_gen(&self, generation: u64) -> Option<Running> {
        self.running().filter(|r| r.generation == generation)
@@ -471,17 +502,71 @@ impl Server {
        self.progress.lock().drain().map(|(_, p)| (p.task, p.title)).collect()
    }

-    pub fn set_diagnostics(&self, path: PathBuf, items: Vec<lsp::Diagnostic>) {
+    /// Records the diagnostics the server pushed for `path`; returns what the file now shows.
+    pub fn set_diagnostics(&self, path: PathBuf, items: Vec<lsp::Diagnostic>) -> Vec<lsp::Diagnostic> {
+        set_or_remove(&mut self.pushed.lock(), path.clone(), items);
+        self.combine(path)
+    }
+
+    /// Records a pulled report for `path` (`None` items: unchanged since `result_id`'s
+    /// predecessor); returns what the file now shows.
+    pub fn set_pulled(
+        &self,
+        path: PathBuf,
+        result_id: Option<String>,
+        items: Option<Vec<lsp::Diagnostic>>,
+    ) -> Vec<lsp::Diagnostic> {
+        {
+            let mut pulled = self.pulled.lock();
+            let entry = pulled.entry(path.clone()).or_default();
+            entry.result_id = result_id;
+            if let Some(items) = items {
+                entry.items = items;
+            }
+        }
+        self.combine(path)
+    }
+
+    /// Forgets the pulled report of a closed file; `None` when there was none.
+    pub fn clear_pulled(&self, path: &Path) -> Option<Vec<lsp::Diagnostic>> {
+        self.pulls.lock().remove(path);
+        self.pulled.lock().remove(path)?;
+        Some(self.combine(path.to_owned()))
+    }
+
+    /// The `resultId` of the last report pulled for `path`.
+    pub fn pulled_result_id(&self, path: &Path) -> Option<String> {
+        self.pulled.lock().get(path).and_then(|p| p.result_id.clone())
+    }
+
+    /// Starts a pull for `path`, superseding earlier ones; see [`Server::is_latest_pull`].
+    pub fn next_pull(&self, path: &Path) -> u64 {
+        static NEXT: std::sync::atomic::AtomicU64 = std::sync::atomic::AtomicU64::new(1);
+        let id = NEXT.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
+        self.pulls.lock().insert(path.to_owned(), id);
+        id
+    }
+
+    pub fn is_latest_pull(&self, path: &Path, id: u64) -> bool {
+        self.pulls.lock().get(path) == Some(&id)
+    }
+
+    fn combine(&self, path: PathBuf) -> Vec<lsp::Diagnostic> {
+        let mut items = self.pushed.lock().get(&path).cloned().unwrap_or_default();
+        if let Some(pulled) = self.pulled.lock().get(&path) {
+            for d in &pulled.items {
+                if !items.contains(d) {
+                    items.push(d.clone());
+                }
+            }
+        }
        {
            let mut d = self.diagnostics.lock();
            self.published.lock().insert(path.clone(), Instant::now());
-            if items.is_empty() {
-                d.remove(&path);
-            } else {
-                d.insert(path, items);
-            }
+            set_or_remove(&mut d, path, items.clone());
        }
        self.published_notify.notify_waiters();
+        items
    }

    /// When diagnostics for `path` were last published by this server.
@@ -506,10 +591,28 @@ impl Server {

    pub fn take_diagnostic_paths(&self) -> Vec<PathBuf> {
        self.published.lock().clear();
+        self.pushed.lock().clear();
+        self.pulled.lock().clear();
+        self.pulls.lock().clear();
        self.diagnostics.lock().drain().map(|(p, _)| p).collect()
    }
 }

+/// A file's last `textDocument/diagnostic` report.
+#[derive(Default)]
+struct Pulled {
+    result_id: Option<String>,
+    items: Vec<lsp::Diagnostic>,
+}
+
+fn set_or_remove(map: &mut HashMap<PathBuf, Vec<lsp::Diagnostic>>, path: PathBuf, items: Vec<lsp::Diagnostic>) {
+    if items.is_empty() {
+        map.remove(&path);
+    } else {
+        map.insert(path, items);
+    }
+}
+
 /// The last `n` stderr lines, led by the exception headline: Node.js / Python /
 /// JVM crashes print the error first and a stack after it, so a plain tail
 /// shows frames without saying what went wrong.
@@ -0,0 +1,89 @@
+//! Reference updates for moved files from vtsls, which has no `workspace/willRenameFiles`:
+//! it updates imports itself after `didRenameFiles`, behind a prompt the client answers. The
+//! IDE asks tsserver for the same edits up front (`getEditsForFileRename`, through
+//! `typescript.tsserverRequest`), so they join the move's preview and undo, and the server's
+//! own update is off (`updateImportsOnFileMove.enabled = "never"` in `languages/*.toml`).
+
+use ide_core::{FileEdit, Pos, Range, TextEdit, WorkspaceEdit};
+use serde::Deserialize;
+use serde_json::{Value, json};
+use std::path::PathBuf;
+
+pub(crate) const COMMAND: &str = "typescript.tsserverRequest";
+
+/// The `typescript.tsserverRequest` arguments asking for the edits of moving `from` to `to`.
+pub(crate) fn request(from: &std::path::Path, to: &std::path::Path) -> Value {
+    json!({
+        "command": COMMAND,
+        "arguments": ["getEditsForFileRename", { "oldFilePath": from, "newFilePath": to }],
+    })
+}
+
+#[derive(Deserialize)]
+struct Location {
+    line: u32,
+    offset: u32,
+}
+
+#[derive(Deserialize)]
+#[serde(rename_all = "camelCase")]
+struct Change {
+    start: Location,
+    end: Location,
+    new_text: String,
+}
+
+#[derive(Deserialize)]
+#[serde(rename_all = "camelCase")]
+struct FileChanges {
+    file_name: PathBuf,
+    text_changes: Vec<Change>,
+}
+
+/// tsserver's `FileCodeEdits[]` (the command's `body`; 1-based lines and UTF-16 offsets) as an edit.
+pub(crate) fn edit(result: &Value) -> WorkspaceEdit {
+    let body = result.get("body").unwrap_or(result);
+    let files: Vec<FileChanges> = serde_json::from_value(body.clone()).unwrap_or_default();
+    let pos = |l: &Location| Pos::new(l.line.saturating_sub(1), l.offset.saturating_sub(1));
+    WorkspaceEdit {
+        files: files
+            .into_iter()
+            .filter(|f| !f.text_changes.is_empty())
+            .map(|f| FileEdit::Edit {
+                path: f.file_name.into(),
+                edits: f
+                    .text_changes
+                    .into_iter()
+                    .map(|c| TextEdit { range: Range::new(pos(&c.start), pos(&c.end)), new_text: c.new_text })
+                    .collect(),
+                version: None,
+            })
+            .collect(),
+        preconditions: Vec::new(),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn converts_tsserver_file_code_edits() {
+        let result = json!({ "success": true, "body": [
+            { "fileName": "/p/src/index.ts", "textChanges": [
+                { "start": { "line": 2, "offset": 31 }, "end": { "line": 2, "offset": 41 }, "newText": "./lib/money.ts" }
+            ] },
+            { "fileName": "/p/src/unchanged.ts", "textChanges": [] }
+        ] });
+        let edit = edit(&result);
+        assert_eq!(edit.files.len(), 1);
+        let FileEdit::Edit { path, edits, version } = &edit.files[0] else { panic!("{edit:?}") };
+        assert_eq!(**path, *std::path::Path::new("/p/src/index.ts"));
+        assert_eq!(
+            edits,
+            &[TextEdit { range: Range::new(Pos::new(1, 30), Pos::new(1, 40)), new_text: "./lib/money.ts".into() }]
+        );
+        assert!(version.is_none());
+        assert!(super::edit(&json!({ "success": false })).files.is_empty());
+    }
+}
@@ -31,6 +31,8 @@ struct MockState {
    errors: Mutex<HashMap<String, (i64, String)>>,
    /// Computes a response from the request and the open documents (before `responses`).
    responder: Mutex<Option<Responder>>,
+    /// Holds the handling of notifications of this method until the gate opens.
+    held: Mutex<Option<(String, Arc<Gate>)>>,
    peer: Mutex<Option<Peer>>,
 }

@@ -74,6 +76,12 @@ struct MockHandler(Arc<MockState>);
 impl Handler for MockHandler {
    fn on_notification(&self, method: &str, params: Value) {
        let s = &self.0;
+        let held = s.held.lock().clone();
+        if let Some((m, gate)) = held
+            && m == method
+        {
+            gate.hold();
+        }
        // Held throughout: a test that sees the effect (a document, the peer gone) also sees the record.
        let mut log = s.notifications.lock();
        let uri = params["textDocument"]["uri"].as_str().unwrap_or_default().to_owned();
@@ -230,6 +238,7 @@ fn server_cfg(name: &str) -> LanguageServerConfig {
        max_java: None,
        launch_error: None,
        tsserver_project: false,
+        resync_on_configuration: false,
        pinned: None,
    }
 }
@@ -269,6 +278,7 @@ fn harness_configured(
        ui_mode: None,
        framework_ui_modes: Vec::new(),
        formatter: None,
+        scratch_template: None,
        tree_sitter: None,
        language_servers: servers
            .iter()
@@ -419,6 +429,7 @@ async fn files_changed_on_disk_reach_the_servers_of_their_language() {
        &[created.clone(), other],
        &[modified.clone(), outside],
        std::slice::from_ref(&removed),
+        &[h.root.join(".venv/lib/site-packages")],
    );
    eventually(|| !s.notified("workspace/didChangeWatchedFiles").is_empty()).await;
    assert_eq!(
@@ -430,12 +441,81 @@ async fn files_changed_on_disk_reach_the_servers_of_their_language() {
        ])
    );
    // Nothing of its languages: no notification.
-    h.mgr.watched_files_changed(&[h.root.join("b.txt")], &[], &[]);
+    h.mgr.watched_files_changed(&[h.root.join("b.txt")], &[], &[], &[]);
    tokio::time::sleep(std::time::Duration::from_millis(100)).await;
    assert_eq!(s.notified("workspace/didChangeWatchedFiles").len(), 1);
    h.mgr.shutdown_all().await;
 }

+/// A server that registers file watchers hears of what they match, inside excluded folders
+/// too (`uv add` into `.venv`, `go get` rewriting `go.mod`); folders outside the project
+/// that relative patterns name are reported for watching; unregistered, it falls back to
+/// its languages' files.
+#[tokio::test(flavor = "multi_thread")]
+async fn registered_file_watchers_choose_the_changes_a_server_hears_of() {
+    let h = harness(&[("mock", incremental_caps())]);
+    let roots = Arc::new(Mutex::new(Vec::<Vec<PathBuf>>::new()));
+    {
+        let roots = roots.clone();
+        h.mgr.set_file_watch_roots_hook(Box::new(move |r| roots.lock().push(r)));
+    }
+    h.open("a.mk", "x");
+    h.wait_status("mock", ServerStatus::Ready).await;
+    let s = h.launcher.state("mock");
+    let outside = tempfile::tempdir().unwrap();
+    let outside = dunce::canonicalize(outside.path()).unwrap();
+    let external = outside.join("venv/lib/site-packages");
+    s.peer()
+        .request::<_, Value>(
+            "client/registerCapability",
+            json!({ "registrations": [{ "id": "w", "method": "workspace/didChangeWatchedFiles", "registerOptions": { "watchers": [
+                { "globPattern": "**/*.{mk,mod}" },
+                { "globPattern": "**/pyrightconfig.json", "kind": 2 },
+                { "globPattern": "**/site-packages/**" },
+                { "globPattern": { "baseUri": uri_of(&external), "pattern": "**" } },
+                { "globPattern": { "baseUri": uri_of(&h.root.join("sub")), "pattern": "**" } },
+            ] } }] }),
+            None,
+        )
+        .await
+        .unwrap();
+    assert_eq!(roots.lock().last(), Some(&vec![external.clone()]), "only folders outside the project");
+
+    let sp = h.root.join(".venv/lib/python3.14/site-packages");
+    let notified = || s.notified("workspace/didChangeWatchedFiles");
+    h.mgr.watched_files_changed(
+        &[h.root.join("go.mod"), h.root.join("notes.txt"), h.root.join("pyrightconfig.json")],
+        &[h.root.join("pyrightconfig.json"), external.join("idna/core.py")],
+        &[h.root.join("old.mk")],
+        &[sp.join("idna"), h.root.join("node_modules/x")],
+    );
+    eventually(|| !notified().is_empty()).await;
+    assert_eq!(
+        notified()[0]["changes"],
+        json!([
+            { "uri": uri_of(&h.root.join("go.mod")), "type": 1 },
+            { "uri": uri_of(&h.root.join("pyrightconfig.json")), "type": 2 },
+            { "uri": uri_of(&external.join("idna/core.py")), "type": 2 },
+            { "uri": uri_of(&h.root.join("old.mk")), "type": 3 },
+            { "uri": uri_of(&sp.join("idna")), "type": 1 },
+        ])
+    );
+
+    s.peer()
+        .request::<_, Value>(
+            "client/unregisterCapability",
+            json!({ "unregisterations": [{ "id": "w", "method": "workspace/didChangeWatchedFiles" }] }),
+            None,
+        )
+        .await
+        .unwrap();
+    assert_eq!(roots.lock().last(), Some(&vec![]));
+    h.mgr.watched_files_changed(&[h.root.join("go.mod"), h.root.join("b.mk")], &[], &[], &[sp.join("idna")]);
+    eventually(|| notified().len() == 2).await;
+    assert_eq!(notified()[1]["changes"], json!([{ "uri": uri_of(&h.root.join("b.mk")), "type": 1 }]));
+    h.mgr.shutdown_all().await;
+}
+
 #[tokio::test(flavor = "multi_thread")]
 async fn initialize_and_incremental_sync() {
    let h = harness(&[("mock", incremental_caps())]);
@@ -697,6 +777,113 @@ async fn diagnostics_become_events_and_feed_code_actions() {
    assert_eq!(err.kind, ide_core::error::ErrorKind::Unavailable);
 }

+/// The diagnostics shown last for `path` by `source`, as their messages.
+fn shown(h: &Harness, path: &Path, source: &str) -> Option<Vec<String>> {
+    h.events.lock().iter().rev().find_map(|e| match e {
+        IdeEvent::Diagnostics { path: p, source: s, items } if **p == *path && s == source => {
+            Some(items.iter().map(|d| d.message.clone()).collect())
+        }
+        _ => None,
+    })
+}
+
+/// Reports a "bad" diagnostic per line containing `bad`, as `textDocument/diagnostic`; answers
+/// `unchanged` when the text is what `previousResultId` was computed from.
+fn pull_responder() -> Responder {
+    Arc::new(|s: &MockState, method: &str, params: &Value| {
+        if method != "textDocument/diagnostic" {
+            return None;
+        }
+        let text = s.docs.lock().get(params["textDocument"]["uri"].as_str()?).cloned()?;
+        let id = format!("{}", text.len() * 31 + text.matches("bad").count());
+        if params["previousResultId"].as_str() == Some(id.as_str()) {
+            return Some(json!({ "kind": "unchanged", "resultId": id }));
+        }
+        let items: Vec<Value> = text
+            .lines()
+            .enumerate()
+            .filter(|(_, l)| l.contains("bad"))
+            .map(|(i, _)| {
+                json!({ "range": {"start":{"line":i,"character":0},"end":{"line":i,"character":3}},
+                        "severity": 1, "message": "bad" })
+            })
+            .collect();
+        Some(json!({ "kind": "full", "resultId": id, "items": items }))
+    })
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn pulled_diagnostics_follow_edits_and_join_pushed_ones() {
+    let mut pull_caps = incremental_caps();
+    pull_caps["diagnosticProvider"] = json!({ "interFileDependencies": false, "workspaceDiagnostics": false });
+    let h = harness(&[("mock", pull_caps), ("push", incremental_caps())]);
+    let s = h.launcher.state("mock");
+    *s.responder.lock() = Some(pull_responder());
+    let (doc, path) = h.open("a.mk", "ok\nbad\n");
+    h.wait_status("mock", ServerStatus::Ready).await;
+    h.wait_status("push", ServerStatus::Ready).await;
+    assert!(s.requested("initialize")[0]["capabilities"]["textDocument"]["diagnostic"].is_object());
+    eventually(|| shown(&h, &path, "mock") == Some(vec!["bad".into()])).await;
+    assert!(h.launcher.state("push").requested("textDocument/diagnostic").is_empty(), "it pulls from providers only");
+
+    // What the server still pushes (rust-analyzer: `cargo check`) shows next to what was pulled.
+    let pushed = json!({ "range": {"start":{"line":0,"character":0},"end":{"line":0,"character":2}},
+                         "severity": 2, "message": "pushed" });
+    s.peer()
+        .notify("textDocument/publishDiagnostics", json!({ "uri": uri_of(&path), "diagnostics": [pushed] }))
+        .unwrap();
+    eventually(|| shown(&h, &path, "mock") == Some(vec!["pushed".into(), "bad".into()])).await;
+
+    // Edits are pulled again once typing pauses.
+    h.mgr.did_change(doc, 2, &[change(rng(0, 0, 0, 0), "bad\n")], &|| unreachable!());
+    eventually(|| shown(&h, &path, "mock") == Some(vec!["pushed".into(), "bad".into(), "bad".into()])).await;
+    // Pulled diagnostics are code actions' context like pushed ones.
+    let _ = h.mgr.code_actions(doc, rng(2, 1, 2, 1), vec![]).await;
+    let ctx = &s.requested("textDocument/codeAction")[0]["context"]["diagnostics"];
+    assert_eq!(ctx.as_array().unwrap().iter().map(|d| d["message"].as_str().unwrap()).collect::<Vec<_>>(), ["bad"]);
+
+    // Saving unchanged text asks with the last result id; `unchanged` keeps what is shown.
+    let pulls = s.requested("textDocument/diagnostic").len();
+    h.mgr.did_save(doc, "bad\nok\nbad\n");
+    eventually(|| s.requested("textDocument/diagnostic").len() > pulls).await;
+    let last = s.requested("textDocument/diagnostic").last().cloned().unwrap();
+    assert!(last["previousResultId"].is_string());
+    tokio::time::sleep(Duration::from_millis(100)).await;
+    assert_eq!(shown(&h, &path, "mock"), Some(vec!["pushed".into(), "bad".into(), "bad".into()]));
+
+    // Closing drops what was pulled; the pushed diagnostics stay the server's to clear.
+    h.mgr.did_close(doc);
+    eventually(|| shown(&h, &path, "mock") == Some(vec!["pushed".into()])).await;
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn a_cancelled_pull_is_retried_and_a_refresh_pulls_again() {
+    let mut caps = incremental_caps();
+    caps["diagnosticProvider"] = json!({ "interFileDependencies": false, "workspaceDiagnostics": false });
+    let h = harness(&[("mock", caps)]);
+    let s = h.launcher.state("mock");
+    *s.responder.lock() = Some(pull_responder());
+    // Busy indexing: the server cancels and asks to be asked again.
+    s.errors.lock().insert("textDocument/diagnostic".into(), (-32802, "indexing".into()));
+    let (_doc, path) = h.open("a.mk", "bad\n");
+    h.wait_status("mock", ServerStatus::Ready).await;
+    eventually(|| s.requested("textDocument/diagnostic").len() >= 2).await;
+    assert_eq!(shown(&h, &path, "mock"), None);
+    s.errors.lock().clear();
+    eventually(|| shown(&h, &path, "mock") == Some(vec!["bad".into()])).await;
+
+    // `workspace/diagnostic/refresh` (e.g. after a project reload) pulls open files again.
+    *s.responder.lock() = Some(Arc::new(|_: &MockState, method: &str, _: &Value| {
+        (method == "textDocument/diagnostic").then(|| {
+            json!({ "kind": "full", "items": [
+            { "range": {"start":{"line":0,"character":0},"end":{"line":0,"character":3}}, "message": "reloaded" } ] })
+        })
+    }));
+    let refreshed: Value = s.peer().request("workspace/diagnostic/refresh", Value::Null, None).await.unwrap();
+    assert_eq!(refreshed, Value::Null);
+    eventually(|| shown(&h, &path, "mock") == Some(vec!["reloaded".into()])).await;
+}
+
 #[tokio::test(flavor = "multi_thread")]
 async fn apply_edit_hook_and_server_requests() {
    let h = harness(&[("mock", incremental_caps())]);
@@ -1040,6 +1227,54 @@ async fn preparation_refreshes_config_and_survives_unchanged_settings() {
    assert_eq!(h.launcher.state("mock").launches.load(Ordering::SeqCst), 1);
 }

+/// Intelephense applies the PHP version only to documents it parses after reading its
+/// configuration: once that is answered, servers that opt in get their open documents again.
+#[tokio::test(flavor = "multi_thread")]
+async fn configuration_answer_resyncs_open_documents_of_opted_in_servers() {
+    let h = harness_configured("mock", "mk", &[("mock", incremental_caps()), ("extra", incremental_caps())], |cfg| {
+        cfg.resync_on_configuration = cfg.name == "mock"
+    });
+    let (doc, path) = h.open("a.mk", "enum A {}");
+    let uri = uri_of(&path);
+    let (s, extra) = (h.launcher.state("mock"), h.launcher.state("extra"));
+    h.wait_status("mock", ServerStatus::Ready).await;
+    h.wait_status("extra", ServerStatus::Ready).await;
+    eventually(|| s.docs.lock().contains_key(&uri) && extra.docs.lock().contains_key(&uri)).await;
+    h.mgr.did_change(doc, 2, &[change(rng(0, 9, 0, 9), "\n")], &|| unreachable!());
+    eventually(|| s.notified("textDocument/didChange").len() == 1).await;
+
+    let items = |section: &str| json!({ "items": [{ "section": section }] });
+    let options = json!([{ "flag": true, "nested": { "deep": 1 } }]);
+    let answer: Value = extra.peer().request("workspace/configuration", items("extra"), None).await.unwrap();
+    assert_eq!(answer, options);
+    // The mock handles what arrives in order, answers included: a re-sync sent before the
+    // answer would hold it back here.
+    let gate = Arc::new(Gate::default());
+    *s.held.lock() = Some(("textDocument/didChange".into(), gate.clone()));
+    let peer = s.peer();
+    let request = peer.request::<_, Value>("workspace/configuration", items("mock"), None);
+    let answer = tokio::time::timeout(Duration::from_secs(10), request).await.expect("re-sync sent before the answer");
+    assert_eq!(answer.unwrap(), options);
+    eventually(|| gate.entered()).await;
+    assert_eq!(s.notified("textDocument/didChange").len(), 1);
+    gate.open();
+    eventually(|| s.notified("textDocument/didChange").len() == 2).await;
+    assert_eq!(
+        s.notified("textDocument/didChange")[1],
+        json!({ "textDocument": { "uri": uri, "version": 2 }, "contentChanges": [{ "text": "enum A {}\n" }] })
+    );
+    assert_eq!(s.docs.lock()[&uri], "enum A {}\n");
+
+    // A notification sent after both answers reaches the servers after anything they triggered.
+    h.mgr.did_save(doc, "enum A {}\n");
+    eventually(|| extra.notified("textDocument/didSave").len() == 1 && s.notified("textDocument/didSave").len() == 1)
+        .await;
+    assert_eq!(s.notified("textDocument/didChange").len(), 2, "one re-sync per answer");
+    let methods: Vec<String> = extra.notifications.lock().iter().map(|(m, _)| m.clone()).collect();
+    assert_eq!(methods, ["initialized", "textDocument/didOpen", "textDocument/didChange", "textDocument/didSave"]);
+    assert_eq!(s.launches.load(Ordering::SeqCst), 1);
+}
+
 #[tokio::test(flavor = "multi_thread")]
 async fn settings_changes_reach_servers_without_restarts() {
    let h = harness(&[("mock", incremental_caps()), ("extra", incremental_caps())]);
@@ -2101,6 +2336,41 @@ async fn will_and_did_rename_files_honour_filters() {
    );
 }

+#[tokio::test(flavor = "multi_thread")]
+async fn will_rename_files_asks_tsserver_when_the_server_has_no_file_operations() {
+    // vtsls: no `willRename` filters, but tsserver's `getEditsForFileRename` through its command.
+    let mut caps = incremental_caps();
+    caps["executeCommandProvider"] = json!({ "commands": ["typescript.tsserverRequest"] });
+    let h = harness_configured("typescript", "ts", &[("vtsls", caps)], |cfg| cfg.tsserver_project = true);
+    let money = h.root.join("money.ts");
+    let index = h.root.join("index.ts");
+    std::fs::write(&money, "export const one = 1;\n").unwrap();
+    std::fs::write(&index, "import { one } from \"./money\";\n").unwrap();
+    let s = h.launcher.state("vtsls");
+    *s.responder.lock() = Some(Arc::new(move |_, method, p| {
+        (method == "workspace/executeCommand" && p["arguments"][0] == "getEditsForFileRename").then(|| {
+            json!({ "success": true, "body": [{ "fileName": p["arguments"][1]["oldFilePath"].as_str().unwrap().replace("money.ts", "index.ts"),
+                "textChanges": [{ "start": { "line": 1, "offset": 22 }, "end": { "line": 1, "offset": 29 }, "newText": "./lib/money" }] }] })
+        })
+    }));
+    let to = h.root.join("lib/money.ts");
+    let result =
+        h.mgr.will_rename_files(&[(money.clone(), to.clone())], ide_core::CancellationToken::new()).await.unwrap();
+    assert_eq!(result.servers, vec!["vtsls".to_owned()]);
+    assert!(result.errors.is_empty(), "{:?}", result.errors);
+    match &result.edit.files[..] {
+        [FileEdit::Edit { path, edits, version: None }] => {
+            assert_eq!(path, &index);
+            assert_eq!(edits[0].range, rng(0, 21, 0, 28));
+            assert_eq!(edits[0].new_text, "./lib/money");
+        }
+        other => panic!("unexpected edit {other:?}"),
+    }
+    let asked = s.requested("workspace/executeCommand");
+    let asked = asked.iter().find(|r| r["arguments"][0] == "getEditsForFileRename").unwrap();
+    assert_eq!(asked["arguments"][1], json!({ "oldFilePath": money, "newFilePath": to }));
+}
+
 // ------------------------------------------------------------------ inspect code

 struct InspectTestHost {
@@ -56,6 +56,7 @@ fn lang(id: &str, ext: &str, server: LanguageServerConfig) -> LanguageConfig {
        ui_mode: None,
        framework_ui_modes: Vec::new(),
        formatter: None,
+        scratch_template: None,
        tree_sitter: None,
        language_servers: vec![server],
        debugger: None,
@@ -134,6 +135,7 @@ async fn missing_binary_is_reported_with_install_hint() {
        max_java: None,
        launch_error: None,
        tsserver_project: false,
+        resync_on_configuration: false,
        pinned: None,
    };
    let (mgr, events) = manager(dir.path(), LanguageRegistry::from_configs(vec![lang("nope", "nope", server)]));
@@ -403,6 +405,7 @@ async fn typescript_language_server_end_to_end() {
        max_java: None,
        launch_error: None,
        tsserver_project: false,
+        resync_on_configuration: false,
        pinned: None,
    };
    let (mgr, events) = manager(&root, LanguageRegistry::from_configs(vec![lang("typescript", "ts", server)]));
@@ -452,6 +455,7 @@ fn npm_server(tools: &Path, name: &str, bin: &str, init: Option<serde_json::Valu
        max_java: None,
        launch_error: None,
        tsserver_project: false,
+        resync_on_configuration: false,
        pinned: None,
    }
 }
@@ -105,6 +105,7 @@ pub trait HostApi: Send + Sync {
        args: Vec<String>,
        cwd: Option<&Path>,
    ) -> Result<(), HostError>;
+    fn open_location(&self, client: Option<&str>, path: &Path, line: u32, column: u32) -> Result<(), HostError>;
    /// A setting of the plugin as JSON (project over global over the schema default).
    fn setting(&self, root: Option<&Path>, key: &str) -> Option<String>;
 }
@@ -467,7 +468,6 @@ const MAX_SYNTAX_ITEMS: usize = 200_000;
 const MAX_BATCH: usize = 1000;

 fn event_to_wit(e: WorkbenchEvent) -> wit_events::Event {
-    use crate::types::ActionSource as S;
    match e {
        WorkbenchEvent::FileOpened(p) => wit_events::Event::FileOpened(p),
        WorkbenchEvent::FileSaved(p) => wit_events::Event::FileSaved(p),
@@ -477,14 +477,7 @@ fn event_to_wit(e: WorkbenchEvent) -> wit_events::Event {
        WorkbenchEvent::ActionPerformed(a) => wit_events::Event::ActionPerformed(wit_events::ActionPerformed {
            action: a.action,
            title: a.title,
-            source: match a.source {
-                S::Keyboard => wit_events::ActionSource::Keyboard,
-                S::Menu => wit_events::ActionSource::Menu,
-                S::Toolbar => wit_events::ActionSource::Toolbar,
-                S::ContextMenu => wit_events::ActionSource::ContextMenu,
-                S::Search => wit_events::ActionSource::Search,
-                S::Other => wit_events::ActionSource::Other,
-            },
+            source: a.source.name().to_owned(),
            shortcut: a.shortcut,
        }),
    }
@@ -670,9 +663,17 @@ impl Runtime {
                detail: i.detail.map(|d| clip(d, MAX_TITLE)),
                kind: i.kind.map(|k| clip(k, 32)),
                insert_text: clip(i.insert_text, 64 << 10),
+                snippet: i.snippet,
                replace: i.replace.map(range_from_wit),
                sort_text: i.sort_text.map(|t| clip(t, 64)),
+                filter_text: i.filter_text.map(|t| clip(t, MAX_TITLE)),
                documentation: i.documentation.map(|d| clip(d, 16 << 10)),
+                additional_edits: i
+                    .additional_edits
+                    .into_iter()
+                    .take(MAX_ADDITIONAL_EDITS)
+                    .map(edit_from_wit)
+                    .collect(),
            })
            .collect())
    }
@@ -699,27 +700,20 @@ impl Runtime {
    ) -> Result<Vec<CodeAction>, CallError> {
        let d = doc_to_wit(doc);
        let actions = self.provider_call(timeout, |p, s| p.call_code_actions(s, &d, range_to_wit(selection)))?;
-        Ok(actions
-            .into_iter()
-            .take(MAX_PROVIDER_ITEMS)
-            .map(|a| CodeAction {
-                title: clip(a.title, MAX_TITLE),
-                kind: a.kind.map(|k| clip(k, 64)),
-                preferred: a.preferred,
-                edits: a
-                    .edits
-                    .into_iter()
-                    .map(|f| {
-                        let edits = f
-                            .edits
-                            .into_iter()
-                            .map(|e| ide_core::TextEdit { range: range_from_wit(e.range), new_text: e.text })
-                            .collect();
-                        (std::path::PathBuf::from(f.path), edits)
-                    })
-                    .collect(),
-            })
-            .collect())
+        Ok(actions.into_iter().take(MAX_PROVIDER_ITEMS).map(code_action_from_wit).collect())
+    }
+
+    /// The edits of an action `provide_code_actions` returned with `data`.
+    pub fn resolve_code_action(
+        &mut self,
+        doc: &ProviderDocument,
+        action: &CodeAction,
+        timeout: Duration,
+    ) -> Result<CodeAction, CallError> {
+        let d = doc_to_wit(doc);
+        let a = code_action_to_wit(action);
+        let resolved = self.provider_call(timeout, |p, s| p.call_resolve_code_action(s, &d, &a))?;
+        resolved.map(code_action_from_wit).map_err(|e| CallError::Guest(e.into()))
    }

    pub fn provide_definition(
@@ -968,6 +962,47 @@ const MAX_VIEW_ITEMS: usize = 20_000;
 const MAX_CELL: usize = 64 << 10;
 const MAX_HTML: usize = 4 << 20;

+/// Most additional edits of a completion item.
+const MAX_ADDITIONAL_EDITS: usize = 100;
+
+fn edit_from_wit(e: wit_types::TextEdit) -> ide_core::TextEdit {
+    ide_core::TextEdit { range: range_from_wit(e.range), new_text: e.text }
+}
+
+fn code_action_from_wit(a: wit_prov::CodeAction) -> CodeAction {
+    CodeAction {
+        title: clip(a.title, MAX_TITLE),
+        kind: a.kind.map(|k| clip(k, 64)),
+        preferred: a.preferred,
+        edits: a
+            .edits
+            .into_iter()
+            .map(|f| (std::path::PathBuf::from(f.path), f.edits.into_iter().map(edit_from_wit).collect()))
+            .collect(),
+        data: a.data.map(|d| clip(d, 64 << 10)),
+    }
+}
+
+fn code_action_to_wit(a: &CodeAction) -> wit_prov::CodeAction {
+    wit_prov::CodeAction {
+        title: a.title.clone(),
+        kind: a.kind.clone(),
+        preferred: a.preferred,
+        edits: a
+            .edits
+            .iter()
+            .map(|(path, edits)| wit_prov::FileEdit {
+                path: path.to_string_lossy().into_owned(),
+                edits: edits
+                    .iter()
+                    .map(|e| wit_types::TextEdit { range: range_to_wit(e.range), text: e.new_text.clone() })
+                    .collect(),
+            })
+            .collect(),
+        data: a.data.clone(),
+    }
+}
+
 fn opt_clip(s: Option<String>, max: usize) -> Option<String> {
    s.map(|s| clip(s, max))
 }
@@ -975,6 +1010,9 @@ fn opt_clip(s: Option<String>, max: usize) -> Option<String> {
 fn view_from_wit(v: wit_vt::View) -> View {
    let body = match v.body {
        wit_vt::Body::Message(m) => ViewBody::Message(clip(m, 16 << 10)),
+        wit_vt::Body::Other(e) => {
+            ViewBody::Message(format!("This view needs a newer version of OpenIDEA ({}).", clip(e.kind, 64)))
+        }
        wit_vt::Body::Tree(items) => ViewBody::Tree(
            items
                .into_iter()
@@ -1006,10 +1044,8 @@ fn view_from_wit(v: wit_vt::View) -> View {
            fields
                .into_iter()
                .take(MAX_VIEW_ITEMS)
-                .map(|f| ViewField {
-                    key: clip(f.key, 128),
-                    label: clip(f.label, MAX_TITLE),
-                    value: match f.value {
+                .filter_map(|f| {
+                    let value = match f.value {
                        wit_vt::FieldValue::Text(t) => FieldValue::Text(clip(t, MAX_CELL)),
                        wit_vt::FieldValue::Multiline(t) => FieldValue::Multiline(clip(t, 1 << 20)),
                        wit_vt::FieldValue::Checkbox(b) => FieldValue::Checkbox(b),
@@ -1017,7 +1053,10 @@ fn view_from_wit(v: wit_vt::View) -> View {
                            options: options.into_iter().take(1000).map(|o| clip(o, MAX_TITLE)).collect(),
                            selected: clip(selected, MAX_TITLE),
                        },
-                    },
+                        // A field type of a newer API: left out.
+                        wit_vt::FieldValue::Other(_) => return None,
+                    };
+                    Some(ViewField { key: clip(f.key, 128), label: clip(f.label, MAX_TITLE), value })
                })
                .collect(),
        ),
@@ -1067,3 +1106,26 @@ fn event_to_wit_view(e: ViewEvent) -> wit_vt::ViewEvent {
        ViewEvent::Message { text } => W::Message(text),
    }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn ext(kind: &str) -> wit_types::Extension {
+        wit_types::Extension { kind: kind.into(), data: "{}".into() }
+    }
+
+    #[test]
+    fn bodies_and_fields_of_a_newer_api_degrade() {
+        let view = |body| wit_vt::View { toolbar: Vec::new(), body, status: None };
+        let shown = view_from_wit(view(wit_vt::Body::Other(ext("markdown"))));
+        assert_eq!(shown.body, ViewBody::Message("This view needs a newer version of OpenIDEA (markdown).".into()));
+        let field = |key: &str, value| wit_vt::Field { key: key.into(), label: key.into(), value };
+        let form = view_from_wit(view(wit_vt::Body::Form(vec![
+            field("color", wit_vt::FieldValue::Other(ext("color"))),
+            field("name", wit_vt::FieldValue::Text("n".into())),
+        ])));
+        let ViewBody::Form(fields) = form.body else { panic!("a form") };
+        assert_eq!(fields.iter().map(|f| f.key.as_str()).collect::<Vec<_>>(), ["name"], "unknown fields are left out");
+    }
+}
@@ -126,6 +126,20 @@ pub enum ActionSource {
    Other,
 }

+impl ActionSource {
+    /// As plugins see it.
+    pub fn name(self) -> &'static str {
+        match self {
+            Self::Keyboard => "keyboard",
+            Self::Menu => "menu",
+            Self::Toolbar => "toolbar",
+            Self::ContextMenu => "context-menu",
+            Self::Search => "search",
+            Self::Other => "other",
+        }
+    }
+}
+
 #[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize, Type)]
 #[serde(rename_all = "camelCase")]
 pub struct ActionPerformed {
@@ -348,9 +362,14 @@ pub struct CompletionItem {
    /// WIT `completion-kind` name (`method`, `keyword`, …).
    pub kind: Option<String>,
    pub insert_text: String,
+    /// `insert_text` has tab stops and placeholders.
+    pub snippet: bool,
    pub replace: Option<ide_core::Range>,
    pub sort_text: Option<String>,
+    pub filter_text: Option<String>,
    pub documentation: Option<String>,
+    /// Applied with the item elsewhere in the document (an import).
+    pub additional_edits: Vec<ide_core::TextEdit>,
 }

 #[derive(Clone, Debug, PartialEq, Eq)]
@@ -365,6 +384,8 @@ pub struct CodeAction {
    pub kind: Option<String>,
    pub preferred: bool,
    pub edits: Vec<(PathBuf, Vec<ide_core::TextEdit>)>,
+    /// The plugin's reference: the edits come from `resolve_code_action`.
+    pub data: Option<String>,
 }

 #[derive(Clone, Debug, PartialEq, Eq)]
@@ -440,20 +440,11 @@ impl vcs::Host for StoreData {
    }
 }

-fn kind_from_wit(k: events::EventKind) -> EventKind {
-    match k {
-        events::EventKind::FileOpened => EventKind::FileOpened,
-        events::EventKind::FileSaved => EventKind::FileSaved,
-        events::EventKind::EditorFocused => EventKind::EditorFocused,
-        events::EventKind::ActionPerformed => EventKind::ActionPerformed,
-        events::EventKind::VcsChanged => EventKind::VcsChanged,
-        events::EventKind::Scheduled => EventKind::Scheduled,
-    }
-}
-
 impl events::Host for StoreData {
-    fn subscribe(&mut self, kind: events::EventKind) -> Fallible<()> {
-        let kind = kind_from_wit(kind);
+    fn subscribe(&mut self, kind: String) -> Fallible<()> {
+        let Some(kind) = EventKind::parse(&kind) else {
+            return Ok(Err(wit::Error::Invalid(format!("no event kind {kind:?} in this OpenIDEA"))));
+        };
        if let Some(cap) = kind.capability()
            && let Err(e) = self.require(cap)
        {
@@ -463,8 +454,10 @@ impl events::Host for StoreData {
        Ok(Ok(()))
    }

-    fn unsubscribe(&mut self, kind: events::EventKind) -> wasmtime::Result<()> {
-        self.host.subscribe(kind_from_wit(kind), false);
+    fn unsubscribe(&mut self, kind: String) -> wasmtime::Result<()> {
+        if let Some(kind) = EventKind::parse(&kind) {
+            self.host.subscribe(kind, false);
+        }
        Ok(())
    }
 }
@@ -542,10 +535,10 @@ impl diagnostics::Host for StoreData {
                    diagnostics::Severity::Hint => ide_core::Severity::Hint,
                },
                message: clip(d.message, 4096),
-                source: Some(source.clone()),
+                source: Some(d.source.map_or_else(|| source.clone(), |s| clip(s, 128))),
                code: d.code.map(|c| clip(c, 128)),
-                unnecessary: false,
-                deprecated: false,
+                unnecessary: d.tags.iter().any(|t| t == "unnecessary"),
+                deprecated: d.tags.iter().any(|t| t == "deprecated"),
                server: Some(source.clone()),
            })
            .collect();
@@ -647,6 +640,21 @@ impl views::Host for StoreData {
        let title = clip(title, crate::runtime::MAX_TITLE);
        Ok(self.host.open_terminal(client.as_deref(), title, &program, args, cwd.as_deref()).map_err(to_wit))
    }
+
+    fn open_location(&mut self, path: String, line: u32, column: u32) -> Fallible<()> {
+        if let Err(e) = self.require(Capability::ProjectRead) {
+            return Ok(Err(e));
+        }
+        let Some(root) = self.invocation.workspace_root.clone() else {
+            return Ok(Err(wit::Error::Invalid("no project is open in this window".into())));
+        };
+        let real = match sandbox::resolve_in_root(&root, &path) {
+            Ok(real) => real,
+            Err(e) => return Ok(Err(wit::Error::Invalid(e))),
+        };
+        let client = self.invocation.client.clone();
+        Ok(self.host.open_location(client.as_deref(), &real, line, column).map_err(to_wit))
+    }
 }

 impl settings::Host for StoreData {