st.chat_input() not resetting to None after script rerun

[jeffkayne]

Checklist

• I have searched the existing issues for similar issues.
• I added a very descriptive title to this issue.
• I have provided sufficient information below to help reproduce this issue.

Summary

Hi guys,

Since streamlit>=1.28.0, there is unexpected behaviour in my streamlit chat app. I have looked at the 1.28.0 commits but haven't spotted anything... The new version seems to not reset the output of st.chat_input() after rerunning the app with st.rerun() or st.experimentatl_rerun(). This causes an RecursionError: maximum recursion depth exceeded while calling a Python object in the app. See code below.

Reproducible Code Example

import streamlit as st

prompt = st.chat_input()
print(prompt)

if prompt:
    st.rerun()

Steps To Reproduce

1. Run the app above
2. Enter a message in the chat input and hit enter

Expected Behavior

After the st.rerun(), I expect the script to rerun, resetting the st.chat_input() and therefore making prompt = None.

Current Behavior

After the st.rerun(), there is an infinite loop, making an error:

RecursionError: maximum recursion depth exceeded while calling a Python object

Is this a regression?

• Yes, this used to work in a previous version.

Debug info

• Streamlit version: 1.28.0
• Python version: 3.10.12
• Operating System: MacOs 13.5.1
• Browser: Chrome

Additional Information

--> Additional info into why I'm using st.rerun() in this context:
I maintain the streamlit-feedback component, which requires the use of st.rerun() to load the most recent feedback component for a chat message. An example of this implementation can be seen here.

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[ghz]

The same with a simple conditionnal button scenario.

Even the example code from the doc doesn't work anymore for egg :

import streamlit as st

if "value" not in st.session_state:
    st.session_state.value = "Title"

st.header(st.session_state.value)

if st.button("Foo"):
    st.session_state.value = "Foo"
    st.rerun()

The on_click fallback seems not affected. This code doesn't provoke any infinite loops :

import streamlit as st

if "value" not in st.session_state:
    st.session_state.value = "Title"

st.header(st.session_state.value)

def callback_fn():
    st.session_state.value = "Foo"
    st.rerun()

st.button("Foo", on_click=callback_fn)

[AnOctopus]

I think I know the cause. As part of session state yield points, I allowed triggers to no longer be reset if the script run was interrupted by a rerun exception, to bring it in line with the behavior of fast reruns. But I neglected to account for st.rerun also causing a rerun exception, and it makes more sense to treat reruns triggered that way as being script run completions. We should have this fixed in a patch release soon.

[vdonato]

Closing this issue as this was addressed by #7643. We'll have the changes released in a patch release tomorrow or Friday