QMainWindow appears without border and title bar on Linux when "Desktop Effects" used

[will49]

My problem was caused because I wasn't setting the window flags correctly (didn't add to the current flags when I wanted to set a particular flag).

My corrected code is:

Qt::WindowFlags flags=windowFlags();
flags^=Qt::WindowMaximizeButtonHint;
setWindowFlags(flags);

Qt::WindowFlags flags=windowFlags();
flags^=Qt::WindowMaximizeButtonHint;
setWindowFlags(flags);

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