QML: Do not alias associated anchor property (for Qt 5.12 compatiblity)

[Holzhaus]

May fix the issue reported here: #3961 (comment)

[Holzhaus]

@daschuer does this work for you?

[daschuer]

Unfortunately it is not completely fixed

Info [Main] Loaded skin "QMLDemo"
debug [Main] DbConnectionPooled - Found thread-local database connection "MIXXX-1" QSqlDatabase(driver="QSQLITE", database="file:///home/sperry/.mixxx/mixxxdb.sqlite", host="", port=-1, user="mixxx", open=true)
debug [Main] Key plugin ID: "qm-keydetector:2"
info [Main] Loaded skin "QMLDemo"
warning [Main] file:///home/sperry/workspace/mixxx/res/skins/QMLDemo/main.qml:54:9: Type Skin.DeckRow unavailable 
             Skin.DeckRow { 
             ^
warning [Main] file:///home/sperry/workspace/mixxx/res/skins/QMLDemo/DeckRow.qml:71:5: Type Deck unavailable 
         Deck { 
         ^
warning [Main] file:///home/sperry/workspace/mixxx/res/skins/QMLDemo/Deck.qml:62:9: Type Skin.WaveformOverview unavailable 
             Skin.WaveformOverview { 
             ^
warning [Main] file:///home/sperry/workspace/mixxx/res/skins/QMLDemo/WaveformOverview.qml:126:9: Type MixxxControls.WaveformOverview unavailable 
             MixxxControls.WaveformOverview { 
             ^
warning [Main] file:///home/sperry/workspace/mixxx/res/skins/QMLDemo/Mixxx/Controls/WaveformOverview.qml:45:9: Type MixxxControls.WaveformOverviewMarker unavailable 
             MixxxControls.WaveformOverviewMarker { 
             ^
warning [Main] file:///home/sperry/workspace/mixxx/res/skins/QMLDemo/Mixxx/Controls/WaveformOverviewMarker.qml:8:14: Expected token `:' 
         required property string group 
                  ^
warning [Main] Skin "QMLDemo" failed to load!
warning [Main] Configured skin  "QMLDemo"  failed to load, falling back to default skin  "LateNight"

[Swiftb0y]

Can we create a pre-commit hook that just bans "required" from all qml files for now? xD

[Holzhaus]

@daschuer please check again

[ninomp]

This fixes the issue for me on Linux Mint 20.1

[uklotzde]

@daschuer Merge?

[daschuer]

It works now, thank you. LGTM