prevent auto-execute on paste and preserve multi-line content in chat input (#5834)

Co-authored-by: HYPERXD <Alish-0x@users.noreply.github.com>
Co-authored-by: Allen Hutchison <adh@google.com>

packages/cli/src/ui/components/InputPrompt.tsx

@@ -71,6 +71,8 @@ export const InputPrompt: React.FC<InputPromptProps> = ({
   const [escPressCount, setEscPressCount] = useState(0);
   const [showEscapePrompt, setShowEscapePrompt] = useState(false);
   const escapeTimerRef = useRef<NodeJS.Timeout | null>(null);
+  const [recentPasteTime, setRecentPasteTime] = useState<number | null>(null);
+  const pasteTimeoutRef = useRef<NodeJS.Timeout | null>(null);
 
   const [dirs, setDirs] = useState<readonly string[]>(
     config.getWorkspaceContext().getDirectories(),
@@ -130,6 +132,9 @@ export const InputPrompt: React.FC<InputPromptProps> = ({
       if (escapeTimerRef.current) {
         clearTimeout(escapeTimerRef.current);
       }
+      if (pasteTimeoutRef.current) {
+        clearTimeout(pasteTimeoutRef.current);
+      }
     },
     [],
   );
@@ -245,6 +250,20 @@ export const InputPrompt: React.FC<InputPromptProps> = ({
       }
 
       if (key.paste) {
+        // Record paste time to prevent accidental auto-submission
+        setRecentPasteTime(Date.now());
+
+        // Clear any existing paste timeout
+        if (pasteTimeoutRef.current) {
+          clearTimeout(pasteTimeoutRef.current);
+        }
+
+        // Clear the paste protection after a safe delay
+        pasteTimeoutRef.current = setTimeout(() => {
+          setRecentPasteTime(null);
+          pasteTimeoutRef.current = null;
+        }, 500);
+
         // Ensure we never accidentally interpret paste as regular input.
         buffer.handleInput(key);
         return;
@@ -460,6 +479,12 @@ export const InputPrompt: React.FC<InputPromptProps> = ({
 
       if (keyMatchers[Command.SUBMIT](key)) {
         if (buffer.text.trim()) {
+          // Check if a paste operation occurred recently to prevent accidental auto-submission
+          if (recentPasteTime !== null) {
+            // Paste occurred recently, ignore this submit to prevent auto-execution
+            return;
+          }
+
           const [row, col] = buffer.cursor;
           const line = buffer.lines[row];
           const charBefore = col > 0 ? cpSlice(line, col - 1, col) : '';
@@ -558,6 +583,7 @@ export const InputPrompt: React.FC<InputPromptProps> = ({
       reverseSearchActive,
       textBeforeReverseSearch,
       cursorPosition,
+      recentPasteTime,
     ],
   );