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Re:HW accelerated Xwayland rendering for Nvidia merged by igneo676 on Friday April 09, 2021 @04:10PM (#26755470)
I had a ton of issues with QT menus until the latest patches from KDE hit Arch's QT packages. Fixed them
Re:HW accelerated Xwayland rendering for Nvidia merged by floatboth on Friday April 09, 2021 @08:29PM (#26757821)
Ooh! Interesting! Will look at these. So far I've reported a couple Qt bugs, well, they got priorities but no fix so far:

https://bugreports.qt.io/browse/QTBUG-87303

https://bugreports.qt.io/browse/QTBUG-87332

If KDE patches actually make menus work okay, that's great. I've been wondering how KDE deals with the bugginess of the wayland QPA, turns out the answer's simple and not KDE-exclusive, nice.

upd: seems like no popup constraint adjustment is set on the kde/5.15 branch. Hopefully there are other improvements though…