Review Request 125913: [Task Manager] Use QtGraphicalEffects for label fade out

[Kai Uwe Broulik]

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https://git.reviewboard.kde.org/r/125913/
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Review request for Plasma.


Bugs: 346050
    https://bugs.kde.org/show_bug.cgi?id=346050


Repository: plasma-desktop


Description
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This removes the custom TextLabel and uses an OpacityMask to fade out the label.


Diffs
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  applets/taskmanager/CMakeLists.txt 3c94cb7 
  applets/taskmanager/package/contents/ui/Task.qml 9350481 
  applets/taskmanager/plugin/taskmanagerplugin.cpp 1be1fed 
  applets/taskmanager/plugin/textlabel.h f5f6de2 
  applets/taskmanager/plugin/textlabel.cpp f916384 

Diff: https://git.reviewboard.kde.org/r/125913/diff/


Testing
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Label is faded out on regular entries and in popup when gets too wide. When gets too narrow label is properly hidden, launchers work fine, too. But there are probably many other usecases and scenarios I didn't know/test.

Also fixes task manager label with QT_DEVICE_PIXELRATIO > 1 (if we were to enable that)


Thanks,

Kai Uwe Broulik

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