Repository: Avaiga/taipy
File: doc/gui/examples/controls/chat-streaming.py (Python)

Code before:
            invoke_long_callback(
                state=state,
                user_function=update_message_with_image,
                user_function_args=[
                    state.get_gui(),
                    get_state_id(state),
                    idx,
                    event.get("text", ""),
                    pages[0].get("thumbnail", {}) if (pages := event.get("pages", [])) and len(pages) else {},
                ],
            )


# set or append a message returning its index in the list
def set_message(state: State, message: str, idx: t.Optional[int] = None):
    if idx is not None and idx < len(state.messages):
        msg = state.messages[idx]
        state.messages[idx] = (msg[0], message, msg[2])
    else:
        idx = len(state.messages)
        state.messages.append((f"{len(state.messages)}", message, users[0][0]))
    state.refresh("messages")
    return idx


# append to an existing message
def append_to_message(state: State, message: str, idx: int):
    if idx < len(state.messages):
        msg = state.messages[idx]
        state.messages[idx] = (msg[0], f"{msg[1]}{message}", msg[2])
        state.refresh("messages")
    return idx


# request the wikipedia API, invoked by send_message
def request_wikipedia(gui: Gui, state_id: str, event_type: str, month: str, day: str):
    # inform the user a request is posted
    idx = invoke_callback(
        gui,
        state_id,
        set_message,
        ["requesting Wikipedia ..."],
    )
    request = wiki_url.format(type=event_type, month=month, day=day)
    req = requests.get(request, headers={"accept": "application/json; charset=utf-8;", "User-Agent": user_agent})
    # handle the response
    if req.status_code == 200:
        # display response
        invoke_callback(
            gui,
            state_id,

Review comment (suggestion):
```suggestion
# Append text to an existing message
```

Code after:
                state=state,
                user_function=update_message_with_image,
                user_function_args=[
                    state.get_gui(),
                    get_state_id(state),
                    idx,
                    event.get("text", ""),
                    pages[0].get("thumbnail", {}) if (pages := event.get("pages", [])) and len(pages) else {},
                ],
            )


# Set a new message or append to an existing message.
# Return the message index in the list.
def set_message(state: State, message: str, idx: t.Optional[int] = None):
    if idx is not None and idx < len(state.messages):
        msg = state.messages[idx]
        state.messages[idx] = (msg[0], message, msg[2])
    else:
        idx = len(state.messages)
        state.messages.append((f"{len(state.messages)}", message, users[0][0]))
    state.refresh("messages")
    return idx


# Append text to an existing message
def append_to_message(state: State, message: str, idx: int):
    if idx < len(state.messages):
        msg = state.messages[idx]
        state.messages[idx] = (msg[0], f"{msg[1]}{message}", msg[2])
        state.refresh("messages")
    return idx


# Invoke the Wikipedia API. This is invoked by send_message()
def request_wikipedia(gui: Gui, state_id: str, event_type: str, month: str, day: str):
    # Let the user known that a query was sent
    idx = invoke_callback(
        gui,
        state_id,
        set_message,
        ["Fetching information from Wikipedia ..."],
    )
    request = wiki_url.format(type=event_type, month=month, day=day)
    req = requests.get(request, headers={"accept": "application/json; charset=utf-8;", "User-Agent": user_agent})
    # Handle the response
    if req.status_code == 200:
        # Display the response
        invoke_callback(
            gui,
            state_id,