Chatbot can't properly render markdown

[scd10]

Describe the bug

Chatbot stream output can't render markdown properly. It seems that '\n' char is stripped during streaming.

Have you searched existing issues? 🔎

• I have searched and found no existing issues

Reproduction

import gradio as gr
import time

with gr.Blocks() as demo:
    chatbot = gr.Chatbot(type="messages", render_markdown=True)
    msg = gr.Textbox()
    clear = gr.Button("Clear")

    def user(user_message, history: list):
        return "", history + [{"role": "user", "content": user_message}]

    def bot(history: list):
        bot_message = "What's your choice?\n  - A\n  - B\n  - C\n"
        history.append({"role": "assistant", "content": "One time output: "+bot_message+"\n\nStream output: "})
        for character in bot_message:
            history[-1]['content'] += character
            time.sleep(0.05)
            yield history

    msg.submit(user, [msg, chatbot], [msg, chatbot], queue=False).then(
        bot, chatbot, chatbot
    )
    clear.click(lambda: None, None, chatbot, queue=False)

demo.launch(server_name='0.0.0.0')

Screenshot

Logs

No response

System Info

Gradio Environment Information:
------------------------------
Operating System: Linux
gradio version: 5.1.0
gradio_client version: 1.4.0

------------------------------------------------
gradio dependencies in your environment:

aiofiles: 23.2.1
anyio: 4.6.0
fastapi: 0.115.0
ffmpy: 0.4.0
gradio-client==1.4.0 is not installed.
httpx: 0.27.2
huggingface-hub: 0.25.1
jinja2: 3.1.4
markupsafe: 2.1.5
numpy: 2.1.2
orjson: 3.10.7
packaging: 24.1
pandas: 2.2.3
pillow: 10.4.0
pydantic: 2.9.2
pydub: 0.25.1
python-multipart: 0.0.12
pyyaml: 6.0.2
ruff: 0.6.9
semantic-version: 2.10.0
tomlkit==0.12.0 is not installed.
typer: 0.12.5
typing-extensions: 4.12.2
urllib3: 2.2.3
uvicorn: 0.31.0
authlib; extra == 'oauth' is not installed.
itsdangerous; extra == 'oauth' is not installed.


gradio_client dependencies in your environment:

fsspec: 2024.9.0
httpx: 0.27.2
huggingface-hub: 0.25.1
packaging: 24.1
typing-extensions: 4.12.2
websockets: 12.0

Severity

I can work around it

[freddyaboulton]

Thanks for filing! This is a duplicate of #9679