https://bugs.kde.org/show_bug.cgi?id=464254
Bug ID: 464254
Summary: "Translucency" effect creates ghost windows when a
window closes automatically
Classification: Plasma
Product: kwin
Version: 5.26.5
Platform: OpenSUSE
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: effects-various
Assignee: kwin-bugs-n...@kde.org
Reporter: vagnerlu...@gmail.com
Target Milestone: ---
SUMMARY
Some applications have splash screens or update screens that will close
automatically after they finish loading or updating their respective software
(such as Krita, LibreOffice, Steam, Discord, etc..), sometimes I'll move these
windows out of the way while working on some task, and as result these windows
will sometimes close while they're being moved.
I've found that while the "Translucency" Desktop Effect is active, this will
cause a "ghost" duplicate of the window being moved to appear. It cannot be
interacted with and will only disappear if compositing is toggled off. It will
also be drawn over if another application takes focus and is brought to the top
of the desktop, but won't disappear.
STEPS TO REPRODUCE
1. Open an application with a splash screen or auto-update start window
2. Move that window
3. Hold it in the moving state until it closes
OBSERVED RESULT
The window will disappear for a few frames and be replaced with a ghost window
EXPECTED RESULT
The window should disappear without any artifacts left behind
SOFTWARE/OS VERSIONS
Linux: openSUSE Tumbleweed
(available in About System)
KDE Plasma Version: 5.26.5
KDE Frameworks Version: 5.101.0
Qt Version: 5.15.8
ADDITIONAL INFORMATION
I initially suspected this to be a Wayland issue, as I had not experienced it
while using X11, and I made the switch around three months ago. However, when
logging into an X11 session I observed the same behaviour, but on X11 I could
actually suspend the compositing to find that these ghost windows wouldn't be
drawn with compositing off. That's what led me to narrow down that it was
actually an issue with the "Translucency" Desktop Effect specifically.
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