https://bugs.kde.org/show_bug.cgi?id=387313

--- Comment #21 from Martin Flöser <mgraess...@kde.org> ---
Adding some investigation results:
 * the observed flickering is "just" buffer age
 * on a multi-screen setup the issue can only be reproduced on the first screen
(which has buffer age enabled)
 * the flickering frames are fine. E.g. for moving the cursor over a menu only
the changed area is repainted. The flickering comes from the aged buffer
 * which means the root problem is that a buffer is painted with incorrect
damage information

Why that is the case I couldn't figure out yet.

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