Created attachment 132866 [details] on the video, the right part of konsole window is flickering STEPS TO REPRODUCE 1. Play a youtube video on a rotated monitor 2. Minimize Konsole on another monitor OBSERVED RESULT Sometimes there is a ghost flickering konsole window. EXPECTED RESULT No glitches.
Edit: it seems like this bug can be reproduced even if you just try to minimize konsole along with running weston-simple-egl. It doesn't matter if they are on the same screen.
A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/401
Git commit 74391e250e9d744c9b8a95bc2f3806bb64b51a7e by Vlad Zahorodnii. Committed on 30/10/2020 at 07:24. Pushed by vladz into branch 'master'. Store repaint regions per individual screen AnimationEffect schedules repaints in postPaintWindow() and performs cleanup in preScreenPaint(). With the X11-style rendering, this doesn't have any issues, scheduled repaints will be reset during the next compositing cycle. But with per screen rendering, we might hit the following case - Paint screen 0 - Reset scheduled repaints - AnimationEffect::prePaintScreen(): update the timeline - AnimationEffect::postPaintScreen(): schedule a repaint - Paint screen 1 - Reset scheduled repaints - AnimationEffect::prePaintScreen(): destroy the animation - AnimationEffect::postPaintScreen(): no repaint is scheduled - Return to the event loop In this scenario, the repaint region scheduled by AnimationEffect will be lost when compositing is performed on screen 1. There is no any other way to fix this issue but maintain repaint regions per each individual screen if per screen rendering is enabled. M +5 -5 composite.cpp M +0 -5 deleted.cpp M +4 -0 plugins/scenes/opengl/scene_opengl.cpp M +3 -0 plugins/scenes/qpainter/scene_qpainter.cpp M +1 -0 plugins/scenes/xrender/scene_xrender.cpp M +84 -6 scene.cpp M +14 -0 scene.h M +26 -37 toplevel.cpp M +1 -9 toplevel.h M +1 -1 unmanaged.cpp M +1 -1 x11client.cpp M +1 -1 xdgshellclient.cpp https://invent.kde.org/plasma/kwin/commit/74391e250e9d744c9b8a95bc2f3806bb64b51a7e