[Breeze] [Bug 428095] Drop menu sometimes has no borders

[Andreas H]

https://bugs.kde.org/show_bug.cgi?id=428095

--- Comment #8 from Andreas H <andreas.haratzis at gmail.com> ---
Hey all!

I've spent some more time tracking this down. It appears breeze popups shown
with widget->popup() (i.e. asynchronously) exhibit this problem. Popups shown
with widget->exec() (i.e. synchronously) do not. 

Furthermore, if the popup has the translucency flag set before popup() is
called then the problem goes away.

It appears (in X11) that after a certain moment, Qt will ignore the
translucency. With exec() the moment is before polish(), and in popup() the
moment is after polish(). 

I dug around the Qt bug tracker and found this. I believe this is the root
cause of the issue, and after this is fixed the issue should fix itself :D 

https://bugreports.qt.io/browse/QTBUG-60822

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