fix(tui): restore prompt from undo autocomplete

packages/tui/src/routes/session/index.tsx

@@ -399,13 +399,9 @@ export function Session() {
       title: "Undo previous message",
       value: "session.undo",
       category: "Session",
-      slash: { name: "undo", aliases: ["revert"] },
+      slash: { name: "undo" },
       run: () => {
         void (async () => {
-          const current = prompt?.current
-          if (current && current.parts.length === 0 && ["/undo", "/revert"].includes(current.input.trim())) {
-            prompt?.reset()
-          }
           const boundary = session()?.revert?.messageID
           const list = messages()
           let target: SessionMessageUser | undefined

packages/tui/src/util/revert-prompt.ts

@@ -2,7 +2,8 @@ import type { SessionMessageUser } from "@opencode-ai/sdk/v2"
 import type { PromptInfo } from "../prompt/history"
 
 export function revertedPrompt(current: PromptInfo, message: SessionMessageUser): PromptInfo | undefined {
-  if (current.input || current.parts.length) return
+  const input = current.input.trim()
+  if (current.parts.length || (input && !"/undo".startsWith(input))) return
 
   return {
     input: message.text,

packages/tui/test/util/revert-prompt.test.ts

@@ -43,6 +43,10 @@ describe("reverted prompt", () => {
     })
   })
 
+  test.each(["/", "/u", "/un", "/und", "/undo", " /undo "])("replaces the undo autocomplete query %p", (input) => {
+    expect(revertedPrompt({ input, parts: [] }, message)?.input).toBe("Fix the tests")
+  })
+
   test("preserves an existing text draft", () => {
     expect(revertedPrompt({ input: "Keep this", parts: [] }, message)).toBeUndefined()
   })