Fix pr #4832: Fix issue #4830: [Bug]: Copy-paste into the "What do yo…

…u want to build?" bar doesn't work

frontend/src/components/chat-input.tsx

@@ -40,18 +40,33 @@ export function ChatInput({
   const [isDraggingOver, setIsDraggingOver] = React.useState(false);
 
   const handlePaste = (event: React.ClipboardEvent<HTMLTextAreaElement>) => {
-    // Only handle paste if we have an image paste handler and there are files
+    // Handle image files if we have an image paste handler
     if (onImagePaste && event.clipboardData.files.length > 0) {
       const files = Array.from(event.clipboardData.files).filter((file) =>
         file.type.startsWith("image/"),
       );
-      // Only prevent default if we found image files to handle
       if (files.length > 0) {
         event.preventDefault();
         onImagePaste(files);
+        return;
       }
     }
-    // For text paste, let the default behavior handle it
+
+    // Handle text paste
+    const text = event.clipboardData.getData('text');
+    if (text && textareaRef.current) {
+      event.preventDefault();
+      const start = textareaRef.current.selectionStart;
+      const end = textareaRef.current.selectionEnd;
+      const currentValue = textareaRef.current.value;
+      const newValue = currentValue.substring(0, start) + text + currentValue.substring(end);
+      textareaRef.current.value = newValue;
+      // Update cursor position
+      const newPosition = start + text.length;
+      textareaRef.current.setSelectionRange(newPosition, newPosition);
+      // Trigger onChange if provided
+      onChange?.(newValue);
+    }
   };
 
   const handleDragOver = (event: React.DragEvent<HTMLTextAreaElement>) => {