Update app.py

app.py

@@ -169,24 +169,20 @@ with gr.Blocks(theme=gr.themes.Soft()) as demo:
                     stop_button   = gr.Button("⏹ Stop", variant="secondary", scale=1)
                     clear_button = gr.Button("Clear", scale=1)
             
-            # 1️⃣  keep the event object in a variable
-            submit_event = submit_button.click(
+            # ①  build the streaming event and save its handle -----------------
+            stream_event = submit_button.click(
                     fn     = send_message,
                     inputs = [user_input, max_tokens_slider, temperature_slider,
                               top_p_slider, current_convo_id, history_state],
                     outputs= [chatbot,      history_state,   conversation_selector]
-            ).then(
-                    fn     = lambda: gr.update(value=""),   # clear the textbox
-                    inputs = None,
-                    outputs= user_input
             )
             
-            # 2️⃣  the stop button only needs to cancel that event
+            # ③  stop button cancels the real streaming event ------------------
             stop_button.click(
-                    fn      = None,         # nothing has to run
+                    fn      = None,
                     inputs  = None,
                     outputs = None,
-                    cancels = [submit_event]    # <-- this does the interrupt
+                    cancels = [stream_event]      # <-- correct event to cancel
             )
                 
             gr.Markdown("**Try these examples:**")