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@JoeCFD solved the transparency issue in my code with mask. but kind of awkward and unnecessary. Submit a bug report with Chris Kawa's test code here https://bugreports.qt.io/browse/QTBUG-124722
@JoeCFD i think on ubuntu it might depend on the windows manager
@JoeCFD The ticket is set to Important.
@JoeCFD My solution with mask for transparency works for LXQt desktop, but not for Gnome Desktop of Ubuntu. Reset of mask regions is wrong sometimes. Added this issue to the bug report.
