fix(app): preserve composer caret after requests (#36503)

packages/app/src/components/prompt-input.tsx

@@ -633,7 +633,9 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
   const isImeComposing = (event: KeyboardEvent) => event.isComposing || composing() || event.keyCode === 229
 
   const handleBlur = () => {
-    savedCursor = currentCursor()
+    const cursor = currentCursor()
+    savedCursor = cursor
+    if (cursor !== null && cursor !== prompt.cursor()) prompt.set(prompt.current(), cursor)
     closePopover()
     setComposing(false)
   }

packages/app/src/pages/session.tsx

@@ -58,6 +58,8 @@ import { useSync } from "@/context/sync"
 import { useTabs } from "@/context/tabs"
 import { TerminalProvider, useTerminal } from "@/context/terminal"
 import { PromptInput } from "@/components/prompt-input"
+import { setCursorPosition } from "@/components/prompt-input/editor-dom"
+import { promptLength } from "@/components/prompt-input/history"
 import { type FollowupDraft, sendFollowupDraft } from "@/components/prompt-input/submit"
 import {
   createPromptInputController,
@@ -1054,7 +1056,10 @@ export default function Page() {
 
     if (event.key.length === 1 && event.key !== "Unidentified" && !(event.ctrlKey || event.metaKey)) {
       if (composer.blocked() || isChildSession()) return
-      inputRef?.focus()
+      const input = inputRef
+      if (!input) return
+      input.focus()
+      setCursorPosition(input, prompt.cursor() ?? promptLength(prompt.current()))
     }
   }