fix(project-tree): list a re-installed SNAPSHOT's entries after reloading the project

A SNAPSHOT installed again replaces its jar in place, which no file watcher
reports, so folders already expanded inside it under External Libraries kept
the old entries, even after collapsing and expanding them again. The project
view now re-reads its loaded folders inside archives when project roots change
(a build tool sync); the backend's archive listing already follows the jar's
modification time and size.

src/features/project-tree/index.ts

@@ -34,6 +34,7 @@ import {
   initProjectTree,
   leadSelection,
   reloadAll,
+  reloadArchiveDirs,
   reloadLoadedDirs,
   setChangedFiles,
   setOpenFiles,
@@ -253,6 +254,7 @@ export function activate(): () => void {
     initProjectTypes(),
     onIdeEvent("fsChanged", (e) => void applyFsChange(e)),
     onIdeEvent("excludedDirsChanged", (e) => void reloadLoadedDirs(e.dirs)),
+    onIdeEvent("projectRootsChanged", () => void reloadArchiveDirs()),
   ];
   return () => {
     disposers.reverse().forEach((d) => d());

src/features/project-tree/store.test.ts

@@ -3,6 +3,7 @@ import { MemoryFs, setProjectFsForTests } from "./fs";
 import { visibleInfo } from "./model";
 import {
   applyFsChange,
+  reloadArchiveDirs,
   reloadLoadedDirs,
   currentModel,
   expandAll,
@@ -114,6 +115,28 @@ describe("refresh of excluded folders", () => {
   });
 });
 
+describe("refresh of library archives", () => {
+  it("re-reads the loaded folders inside archives only", async () => {
+    await fs.createFile("/m2/lib.jar!/p/A.class");
+    await loadDir(ROOT);
+    await loadDir("/m2/lib.jar!");
+    await loadDir("/m2/lib.jar!/p");
+    await fs.createFile("/m2/lib.jar!/p/B.class");
+    const spy = vi.spyOn(fs, "readDir");
+
+    await reloadArchiveDirs();
+
+    expect(spy.mock.calls.map(([p]) => p).sort()).toEqual(["/m2/lib.jar!", "/m2/lib.jar!/p"]);
+    expect(
+      useProjectTree
+        .getState()
+        .listings.get("/m2/lib.jar!/p")
+        ?.map((e) => e.name),
+    ).toEqual(["A.class", "B.class"]);
+    spy.mockRestore();
+  });
+});
+
 describe("refresh on ignore-rule changes", () => {
   it("refreshes loaded descendants once, preserving selection and unrelated folders", async () => {
     await fs.createFile("/p/docs/sub/note.md");

src/features/project-tree/store.ts

@@ -565,6 +565,16 @@ export async function reloadLoadedDirs(dirs: readonly string[]) {
   await Promise.all(dirs.filter((p) => listings.has(p)).map((p) => loadDir(p, true)));
 }
 
+/**
+ * Re-reads the loaded folders inside archives (`<archive>!…`): a build tool sync may have replaced
+ * a library jar in place (a SNAPSHOT installed again), which no file watcher reports.
+ */
+export async function reloadArchiveDirs() {
+  const { listings } = get();
+  const inArchive = (p: string) => p.endsWith("!") || p.includes("!/") || p.includes("!\\");
+  await Promise.all([...listings.keys()].filter(inArchive).map((p) => loadDir(p, true)));
+}
+
 /** Re-reads every loaded folder (View › Reload from Disk). */
 export async function reloadAll() {
   const { listings } = get();