https://bugs.kde.org/show_bug.cgi?id=426069
Bug ID: 426069
Summary: XWayland apps are occasionally not rendered when
switching virtual desktops
Product: kwin
Version: git master
Platform: openSUSE RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: herzensch...@gmail.com
Target Milestone: ---
SUMMARY
Not entirely sure whether this is the correct product, please send it to the
correct one if it's not kwin.
I've been affected by this bug for a few months at least.
I usually have 4 or 6 virtual desktops (VDs) at any given time. Usually I have
several XWayland apps running maximized, be they Electron (Slack) or not
(Telegram), normal packages (Kontact) or from Flatpak (WPS Office). On
occasion, switching to another VD renders the app invisible.
In such a state, opening any application and moving it on top of the invisible
one creates a graphical glitch.
This issue most notably occurs with WPS Office, Kontact and Chromium, and never
with wayland telegram or Kate, which leads me to think it's related to
XWayland.
It takes a while to reproduce, but it is reproduced consistently. By this I
mean that it is not reproducible every single time you switch a VD, but if you
test it enough you will inevitably reproduce this issue (just be patient).
It is also not related to the number of cycles, as it may appear after 5 cycles
or 20 cycles.
I am not sure whether clicking a task icon reproduces this as it takes much
more time to reproduce. Same with Meta+number keyboard shortcuts. I'll test
this later.
STEPS TO REPRODUCE
1. Create three virtual desktops in a wayland session, easiest to reproduce
with them in line
2. Have one maximized application in each of them, at least one running on
XWayland
3. Cycle between them using a keyboard shortcut
OBSERVED RESULT
Application is not rendered
EXPECTED RESULT
Application should appear as normal
SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20200823
KDE Plasma Version: 5.19.80
KDE Frameworks Version: 5.74.0
Qt Version: 5.15.0
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