https://bugs.kde.org/show_bug.cgi?id=481322
Bug ID: 481322
Summary: When switching tasks, "Hightlight Window" effect
causes flickering of maximized windows
Classification: Plasma
Product: kwin
Version: 5.93.0
Platform: Other
OS: Linux
Status: REPORTED
Keywords: reproducible
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: xalt7x.serv...@gmail.com
Target Milestone: ---
Created attachment 165819
--> https://bugs.kde.org/attachment.cgi?id=165819&action=edit
Screencast demonstrating flickering with the Hightlight Window effect
SUMMARY
"Highlight Window" effect makes possible to hightlight windows while hovering
over taskbar entries. When user selects some window (by hover over taskbar
window entry or by switching with tasks with Alt+Tab), other windows temporally
hide, so user can focus on a particular window. "Highlight Window" doesn't
hide other elements (e.g. desktop, panel, widgets), and this effect works
really well when user has a only floating windows.
However, when user switches between maximized window, there's always a
distracting side effect. For a very short time highlighted window becomes
semi-transparent so user sees desktop, then window becomes opaque again.
STEPS TO REPRODUCE (please also see screencast in attachment)
1. Open and maximize several windows
2. Press and hold "Alt" key
3. While holding "Alt", slowly press "Tab" several times to switch between
windows
OBSERVED RESULT
After temporal switch to the Task Switcher task, there's a brief flickering
(highlighted window becomes semi-transparrent showing desktop)
EXPECTED RESULT
I don't need to briefly see desktop when I switch to the maximized window.
I also think that option to not hide other window might improve experience with
tiled windows for some users.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora Kinoite Rawhide (40)
KDE Plasma Version: 5.93.0
KDE Frameworks Version: 5.249.0
Qt Version: 6.6.1
ADDITIONAL INFORMATION
It's not Plasma 6 or Wayland regression. I have the same issue on Plasma 5.27
Also, as you can see from the screencast, highlight of the taskbar entries can
be smoother sometimes. There's still some unwanted flickering but transition
goes from the window below, not from desktop (as in the case with the Task
Switcher).
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