library interaction controller COs not working on QT6 / noQML build

[ywwg]

Bug Description

I have controller encoders bound to navigate the library -- up, down, load track, change focus, etc. In a QT6 build, these bindings stop working and have no effect. I believe these COs emit keyboard events to cause the UI changes? That might be what broke

Version

HEAD

OS

Ubuntu 22.04

[ywwg]

Added a new QT6 label because I suspect that will be useful :)

[ronso0]

many (all?) library controls are guarded by
Qt version < 6.0 https://github.com/mixxxdj/mixxx/blob/main/src/library/librarycontrol.cpp because Qt6 was assumed to build the Qml library, but does now build the legacy interface hy default?
So replacing these guards with #ifdef QML, if that exists, would enable them again.

[ronso0]

It's #ifndef MIXXX_USE_QML
Dunno why that was not changed in #11608 -> 3d1c7a6

Changing the remainders is a no-brainer. Is someone already fixing this?

[fwcd]

Not sure, but I stumbled upon this and couldn't find anything, so I opened #11877. I've only updated the controller-related #ifs, since I wasn't sure about the others.