Add functionality to be able to submit with "return" key on keyboard

app.py

@@ -55,14 +55,32 @@ with gr.Blocks() as demo:
                 user_chat_input = gr.Textbox(label="User input", scale=9)
                 user_chat_submit = gr.Button("Ask/answer model", scale=1)
 
-    # First add user's message to the conversation history
+    # First add user's message to the conversation history when user presses "enter" or hits the submit button
     # Then get reply from the tutor and add that to the conversation history
-    user_chat_submit.click(
-        fn = add_user_message, inputs = [user_chat_input, study_tutor], outputs = [user_chat_input, chatbot, study_tutor], queue=False
+    user_chat_input.submit(
+        fn = add_user_message, 
+        inputs = [user_chat_input, study_tutor], 
+        outputs = [user_chat_input, chatbot, study_tutor], 
+        queue=False
     ).then(
-        fn = get_tutor_reply, inputs = [study_tutor], outputs = [user_chat_input, chatbot, study_tutor], queue=True
+        fn = get_tutor_reply, 
+        inputs = [study_tutor], 
+        outputs = [user_chat_input, chatbot, study_tutor], 
+        queue=True
     )
 
+    user_chat_submit.click(
+        fn = add_user_message, 
+        inputs = [user_chat_input, study_tutor], 
+        outputs = [user_chat_input, chatbot, study_tutor], 
+        queue=False
+    ).then(
+        fn = get_tutor_reply, 
+        inputs = [study_tutor], 
+        outputs = [user_chat_input, chatbot, study_tutor], 
+        queue=True
+    )
+    
     # Testing the chat history storage, can be deleted at deployment
     with gr.Blocks():
         test_btn = gr.Button("View your chat history")