fix: resolve race condition in message editor

Fixes data loss when user sends message concurrently with tool response.

Problem:
When a tool response arrives (sendingDisabled=true) while user is typing,
clicking Send queues the message but immediately calls clearDraft(),
causing the input to be wiped before processing.

Solution:
- Remove clearDraft() call when message is queued (sendingDisabled path)
- Reduce autosave debounce from 300ms to 100ms
- Message remains visible until properly processed

Changes:
- webview-ui/src/components/chat/ChatView.tsx
- webview-ui/src/hooks/useAutosaveDraft.ts
- webview-ui/src/components/chat/__tests__/ChatView.raceCondition.spec.tsx

Tests: 10 unit tests covering bug reproduction, fix verification,
and autosave interaction (all passing)

Author: jsboige

.changeset/fix-message-editor-autosave-draft.md

@@ -2,4 +2,9 @@
 "roo-cline": patch
 ---
 
-Fix critical data loss bug in message editor by implementing autosave draft functionality with localStorage persistence. Messages are now automatically saved as users type and restored after webview reloads, with proper conversation isolation and debouncing for optimal performance.
+Fix critical data loss bug in message editor caused by race condition when sending messages while tool responses arrive. This fix includes two complementary solutions:
+
+1. **Race Condition Fix**: Modified message sending logic to preserve user input when messages are queued but not yet sent, preventing data loss during concurrent state updates
+2. **Autosave Draft**: Implemented localStorage-based draft persistence with automatic save/restore on webview reloads, conversation isolation, and optimized 100ms debouncing
+
+Both fixes work together to ensure user input is never lost, whether from race conditions or webview reloads.

webview-ui/src/components/chat/ChatView.tsx

@@ -180,7 +180,7 @@ const ChatViewComponent: React.ForwardRefRenderFunction<ChatViewRef, ChatViewPro
 		hasInitialDraft,
 	} = useAutosaveDraft({
 		key: currentTaskItem?.id || "default",
-		debounceMs: 300,
+		debounceMs: 100,
 		clearOnSubmit: true,
 	})
 	const inputValueRef = useRef(inputValue)
@@ -609,8 +609,12 @@ const ChatViewComponent: React.ForwardRefRenderFunction<ChatViewRef, ChatViewPro
 					try {
 						console.log("queueMessage", text, images)
 						vscode.postMessage({ type: "queueMessage", text, images })
-						clearDraft()
-						setSelectedImages([])
+						// RACE CONDITION FIX: Do NOT clear draft immediately when queueing
+						// The message is queued, not sent yet. Keep the draft visible until
+						// the system processes the queue. This prevents data loss if user
+						// typed quickly (<100ms) or if concurrent tool response arrived.
+						// The draft will be cleared when the queued message is actually processed.
+						// Note: setSelectedImages is also kept to maintain the message state
 					} catch (error) {
 						console.error(
 							`Failed to queue message: ${error instanceof Error ? error.message : String(error)}`,