Dialog boxes don't function when nested inside fragments (fragments inside fragments not supported)

[mzientek]

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

I'm trying to present a dialog box within a fragment, however, when the dialog/modal is nested inside a fragment, it doesn't interact correctly and doesn't close. The content inside the box closes when interacting with it, but the title and the dialog box itself remain open.

Reproducible Code Example

import streamlit as st

@st.experimental_dialog("Test Dialog")
def dialog_box():
    st.markdown("Hello world")
    if st.button("Do something")
        st.markdown("Did it")
    if st.button("Close"):
        st.rerun()

@st.experimental_fragment
def fragment():
    if st.button("Open Dialog"):
        dialog_box() 

fragment()

Steps To Reproduce

1. Go to "Open Dialog"
2. Click on either "Do something" or "Close" to observe the behavior.

Expected Behavior

Expected that the dialog box would be able to function within a fragment and that the close and rerun, would in fact close the dialog box.

Current Behavior

No response

Is this a regression?

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

Debug info

• Streamlit version: 1.34.0
• Python version: 3.9.18
• Operating System: Ubuntu 20.04
• Browser: Firefox

Additional Information

No response

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[raethlein]

Hey @mzientek, according to our concept docs for fragements in the "Limitations and unsupported behavior" section, we unfortunately right now do not allow nesting fragments inside each other. Since dialog is using fragments under-the-hood, the same applies to dialog. We will look into improving the UX and throw an error or similar to make this clearer! If this behavior will change in the future, we will put it into the respective release notes.

[mzientek]

Ok, thanks.

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