https://bugs.kde.org/show_bug.cgi?id=400987

--- Comment #17 from Méven Car <meve...@gmail.com> ---
I found a working reproducing method.

I have a two screens setup a 2560x1440 and 1280x1024.

My main screen is the biggest one on the left of the other one.

Whenever I move a xwayland app to the right screen from the left one, the
window becomes unresponsive to clicks and keyboard.
I get a weird behavior:
when I click on the window or use the scroll wheel a xwayland window on the
other screen gets clicked and scrolled and the current xwayland window
flickers. Except the position of those clicks on the other window are not
right.
Meanwhile at each click, The taskbar shows me that the window focus is changed
from the not-working window to the one on the other screen. Depending on this
focus, the keyboard input follows from one window to the other.

Sometimes this behavior appears spontaneously for a window that did not change
of screen.

It works with vlc, spotify, firefox.

Kubuntu 18.10
Linux 4.18.0-11-generic
KDE Frameworks 5.52.0
Qt 5.11.1
lspci | grep VGA
07:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Baffin [Radeon RX 550 640SP / RX 560/560X] (rev cf)glxinfo  | grep OpenGL
OpenGL vendor string: X.Org
OpenGL renderer string: Radeon RX 560 Series (POLARIS11, DRM 3.26.0,
4.18.0-11-generic, LLVM 7.0.0)
OpenGL core profile version string: 4.5 (Core Profile) Mesa 18.2.2

I can add more details if needed.

I hope this helps !

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