https://bugs.kde.org/show_bug.cgi?id=363500
--- Comment #8 from Thomas Lübking <thomas.luebk...@gmail.com> ---
The black border around windows is clearly bug #361154 (unlike original bug
fits in usage pattern aside visual results), but the "flickering" desktop is
interesting.
Either the desktop window (uses GL as well) switches between a valid and an
invalid texture or kwin picked some junk desktop (black for eg. an invalid
window texture) and missed a global update in the buffer age chain.
Forcing a (series of) full scene repaints like un/maximizing one of the windows
a couple of times should "fix" the buffer chain and running
KWIN_USE_BUFFER_AGE=0 kwin_x11 --replace &
along a tearing prevention forced to full scene repaints should prevent the
flicker from occuring at all (likewise "tearing prevention: none" should
prevent it)
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