https://bugs.kde.org/show_bug.cgi?id=458622
Bug ID: 458622
Summary: Window order gets briefly switched when changing
workspaces, when a window is set to appear on all
desktops
Product: kwin
Version: 5.25.4
Platform: Archlinux Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: adam.m.fontenot+...@gmail.com
Target Milestone: ---
Created attachment 151775
--> https://bugs.kde.org/attachment.cgi?id=151775&action=edit
screen recording of the problem
SUMMARY
When you have a window open on workspace 1, and another window open on
workspace 2, a third window that is set to show up on all desktops will briefly
pop up above the other windows, before (spontaneously) finding its correct
order a second or so later, every time you change workspaces.
This is *extremely* irritating and should be easy to reproduce.
The bug is probably somehow related to
https://bugs.kde.org/show_bug.cgi?id=455429 but it's not the same issue. I
don't have "slide back" enabled.
Note: I'm using "workspace" and "desktop" synonymously in what follows. KDE is
not consistent in how it describes this concept.
STEPS TO REPRODUCE
1. Open a window on workspace 1 and another window on workspace 2.
2. Open a third window and use the window actions to put the window "On All
Desktops".
3. Toggle between the workspaces and raise the windows you created in step 1 so
that they're above the third window in the order.
4. Toggle between the workspaces.
OBSERVED RESULT
The third window (created in step 2) that is set to open on all desktops will
briefly "flash" above the other windows when you change workspaces, even though
it should be at the bottom of the stack on both workspaces. After a brief (~1s)
period, it will then drop down below the other windows to its correct order.
Windows set to appear on all desktops will briefly flash above even windows
that have "keep above" set.
Changing the Virtual Desktop Switching Animation to "Fade Desktop" instead of
"Slide" does not fix the problem. It's a little harder to detect because the
animation is faster, but definitely still happening.
EXPECTED RESULT
Windows should stay at the correct order when switching workspaces.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.25.4
KDE Frameworks Version: 5.97.0
Qt Version: 5.15.5
Kernel Version: 5.19.5-arch1-1 (64-bit)
Graphics Platform: X11
Graphics Processor: Mesa Intel® HD Graphics 3000
ADDITIONAL INFORMATION
I'm about 90% sure I saw someone report this issue on the KDE subreddit around
the time 5.25 was released, but I can't seem to find it now.
I think this is a regression in 5.25 but I'm not certain about that. At the
very least it's a regression over ~6 months ago.
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