track selection in library UI is broken after switching away and back to mixxx

[Foss-4]

macOS 10.13.5
mixxx-2.2.0-alpha-pre-master-git6517-release-macintel64.dmg
xone k2

Reproducible: always
skins: tested tango and deere both affected

Steps

1. open mixxx > library
2. switch to other software and click into window (⌘TAB)
3. switch back to mixxx (⌘TAB)
4. turn controller knob for track selection

Currently

the selection behaves as if the shift key was pressed, it grows into both directions (up / down) and makes it impossible to see on which track the selector is on

Expected

only a single track should be selected

[Foss-4 (foss-4)]

retested macOS 10.13.6
mixxx 2.3.0-alpha-pre (build master r6770)

still happening but much more infrequently and it's harder to reproduce this now. guess that's an improvement, but don't want to close the bug yet.

[Foss-4 (foss-4)]

There has not been a commit addressing this. Still wanted to share this is peristing on macOS 10.14.6 and 2.3.0-alpha-pre (build master r7018).

[Be (be.ing)]

The Xone K2 mapping uses [Playlist], SelectNextTrack/SelectPrevTrack

[Be (be.ing)]

I have noticed this sometimes on Linux, but I cannot reproduce it by switching away from the Mixxx window and back. I have not figured out how to reproduce it reliably.

[Foss-4 (foss-4)]

Can no longer reproduce on macOS 10.15.3 mixxx 2.3.0-alpha-pre (build master r7148)

closing, will re-open if needed.

[Swiftb0y (swiftb0y)]

Mixxx now uses GitHub for bug tracking. This bug has been migrated to:
https://github.com/mixxxdj/mixxx/issues/9340