Qt6 upgrade

[yeahitsjan]

This issue is for tracking / writing down steps to fulfill to upgrade to Qt6. This list will expand regularly, feel free to add your own search results as comments. If changes are implemented for it, these are also added as a corresponding comment.

• Replace QPixmap::grabWindow with QScreen::grabWindow
• Replace QDesktopWidget with QScreen / QGuiApplication
• setMargin is now setContentsMargin
• Replace QtGraphicalEffects (it seems like its removed)
• Replace easylogging++ with loguru

[yeahitsjan]

Reported from discord (@nuttyartist):
Easylogging++ uses Qt5 classes that are not available in Qt6 anymore. I already thought about replacing it with loguru and we definitely need to replace it when upgrading to Qt6.

[MrAda]

Just checking in to see if any Qt6 progress has been made. I downloaded it and am making fixes as I go. Before I get any further is this going to work on Android? That is what I need as the Qt example for doing Windows Desktop works fine.

[yeahitsjan]

Hey @MrAda, I had problems with Qt6 recently and currently on a move to a new location. Only Windows & Linux is supported. FramelessHelper (underlying lib) is only available on Win, Linux (X11 and Wayland) and macOS. I think there are some big changes required that Pawxel will work on Android. Also I do not have any native device to test.