https://bugs.kde.org/show_bug.cgi?id=458778
Bug ID: 458778
Summary: Windows disappear after snapping
Product: kwin
Version: 5.25.4
Platform: Archlinux Packages
OS: Linux
Status: REPORTED
Severity: critical
Priority: NOR
Component: core
Assignee: kwin-bugs-n...@kde.org
Reporter: kco...@gmail.com
Target Milestone: ---
In certain situations, windows disappear (become invisible and cannot be
interacted with) while still running after you move them from their window
snapped positions (left or right half of the screen). If you restart kwin
(kwin_x11 --replace) they reappear. I believe this bug has been around for a
while now. Initially I thought it was a Chromium bug; but now I've seen my
Okular disappear as well.
STEPS TO REPRODUCE
1. Unknown. So far, Chromium and Okular have exhibited this kind of behavior.
Run either one of those.
2. Snap them to the left or to the right side of the screen. (How many times?
Unknown.)
3. Don't close them.
OBSERVED RESULT
The window you dragged from the snap zone disappears, but it remains open in
the panel task manager.
EXPECTED RESULT
The window does not disappear (it hasn't been closed).
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux
KDE Plasma Version: 5.25.4
KDE Frameworks Version: 5.97.0
Qt Version: 5.15.5
ADDITIONAL INFORMATION
I've seen this happen on both Intel and AMD GPUs, irrespective of scaling.
I haven't experienced this on Plasma Wayland (yet).
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