Global menu on Wayland

[Sjoer van der Ploeg]

kded6 (6.5.0) throws the not very descriptive error:

org.kde.plasma.appmenu: Got an error

It does this four times successively and fails to populate the global menu.

This is on Arch with Plasma on Wayland, it works fine on X11.

[Sjoer van der Ploeg]

Might actually be a kded6 issue!

When kded6 is started on a Wayland session with QT_QPA_PLATFORM=wayland the appmenu does not work for some "non-QT" applications, when it is started with QT_QPA_PLATFORM=xcb it does work but then things like scaling do not apply correctly.

I raised a bug with KDE as well, I will have to update my findings there as well as I think this belongs there.

[Sjoer van der Ploeg]

@falkTX I noticed you added QT6 support in the recent commits, how do I force the QT6 frontend?

I see in the code the check for 5 happens before 6 on quite a few occasions, this likely uses QT5 whenever it is available instead of QT6?