Panic when parent of PopupWindow is destroyed: called `Option::unwrap()` on a `None` value

[lifeRobot]

slint 1.4.1 when I called PopupWindow. close(), the program panic! I am using third-party components jui/message/confirm at that time,

1. a thread was changing global properties, see code
2. I click jui/confirm components to close PopupWindow, and then the program panic!
3. see panic! code

this issue like: #4500

[lifeRobot]

add issue description

1. I did not use or install qt, I guess it's the default rendering(femtovg or software)

[tronical]

Thanks for the report. Do you have some .slint code around that could help us reproduce this?

[lifeRobot]

Thanks for the report. Do you have some .slint code around that could help us reproduce this?

yes, I reproduced this question, y can see jui_test example

now I think this may not be a bug, but a problem with the logic of my code

[lifeRobot]

Thanks for the report. Do you have some .slint code around that could help us reproduce this?

Supplementary explanation

1. when testing jui_test, I also found that as long as PopupWindow is opened and the global variable TestGlobal is changed, the jui_test program will painc!
2. so now I think this may be a bug, because the business logic may change the rendering of components when PopupWindow is displayed, but if we can avoid changing the rendering of PopupWindow components, this issue will not occur

[ogoffart]

Thanks for all the info. This is actually a variant of https://github.com/slint-ui/slint/issues/3464 which is enabled by the PopupWindow. In your example, the parent component of a PopupWindow is destroyed by a timer. but the PopupWindow still exists.

A simpler reproducer is this:

export component Demo  {
    in property <string> text : "Hello";
    in-out property <bool> cond:true;
    if cond : Rectangle {
        p := PopupWindow {
            t := Text { text: root.text; }
        }
        TouchArea {
            clicked => {
                p.show();
                cond = false;
            }
        }
    }
}