[BUG] Error when using poll variable inside `literal`

[edwin0cheng]

Checklist before submitting an issue

• I have searched through the existing closed and open issues for eww and made sure this is not a duplicate
• I have specifically verified that this bug is not a common user error
• I am providing as much relevant information as I am able to in this bug report (Minimal config to reproduce the issue for example, if applicable)

Description of the bug

When using literal , and inside that literal is referencing another variable, an error "Couldn't upgrade reference, widget got deallocated" occurred.

The related code :
https://github.com/elkowar/eww/blob/98c220126d912b935987766f56650b55f3e226eb/crates/eww/src/widgets/def_widget_macro.rs#L52C50-L52C102

I am not familiar with the code base, but my guess is that the listener is not unregistered after old widget is deleted by the new poll variable triggered ?

Reproducing the issue

eww.yack

 (deflisten vf "script.sh")  
 (defvar vf "script.sh")  

 (defwidget widget [] (literal :content vf))
 (defwindow window (widget))

script.sh

#!/bin/bash

widget()
{
	w='(box (button :onclick "eww update vv=true --config='.' " "show")(button :onclick "eww update vv=false --config='.'" "hide")(revealer :reveal vv (label :text "Yeah")))'
	echo "$w"
}

widget

eww --config . --logs open window

And when you click on the hide button, the error is showed in the logs:

Caused by:
    Couldn't upgrade reference, widget got deallocated
 2025-05-19T01:07:08.283Z ERROR eww::error_handling_ctx > Error while updating UI after state change

Expected behaviour

No response

Additional context

No response

Platform and environment

wayland, hypland