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Suggestion
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    Resolution: Done
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P3: Somewhat important
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    5.11, 5.13
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    None
 
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        a0f28cd174a7b139f3430e2c0e400dfca093ce5f
 
Seems like an error at documentation:
https://doc.qt.io/qt-5/stylesheet-examples.html#customizing-qmenubar

QSS attribute "spacing" should be placed at QMenuBar, not QManuBar::item