Bug 485272

SUMMARY
in feathernotes, when i use the font popup to change some element in my sheet, the popup is freezing

that is what i get in the logd:

```
qt.qpa.wayland: Creating a popup with a parent, QWidgetWindow(0x644e78df8a20, name="FNWindow") which does not match the current topmost grabbing popup, QWidgetWindow(0x644e78bdabd0, name="QMenuClassWindow") With some shell surface protocols, this is not allowed. The wayland QPA plugin is currently handling it by setting the parent to the topmost grabbing popup. Note, however, that this may cause positioning errors and popups closing unxpectedly. Please fix the transient parent of the popup.
```

SUMMARY
STEPS TO REPRODUCE
1. open feathernotes
2. setting > options   THEN SELECT either 'Document font' OR 'Node font'
3. observe  the uselessness of the font popup 

OBSERVED RESULT
the font popup that appeared is frozen

EXPECTED RESULT
do what i suppose to do with a font popup

SOFTWARE/OS VERSIONS
Operating System: EndeavourOS 
KDE Plasma Version: 6.0.3
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.3

feathernotes Version: 1.2.0

ADDITIONAL INFORMATION
i've already reported this issue to the dev feathernotes github.
according to him it is a problem linked to kde/plasma. see the link below:
https://github.com/tsujan/FeatherNotes/issues/356#issuecomment-2041609514