https://bugs.kde.org/show_bug.cgi?id=365918

--- Comment #12 from Thomas Lübking <thomas.luebk...@gmail.com> ---
The flicker is due to the re-used buffer, the question is why one of them is
invalid but for the newly exposed area and this seems to be related to window
decorations.

Let's start with the obvious: pelase deactivate blur and contrast effects
(kcmshell5 kwineffects) and see whether it's still a problem.

You can also try
  export KWIN_USE_BUFFER_AGE=0
  kwin_x11 --replace &

and see what happens (this will read the old data from the front buffer instead
of relying on the buffer_age extension)

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