https://bugs.kde.org/show_bug.cgi?id=478751
Bug ID: 478751
Summary: Breeze theme creates flickering effect in window title
bar when changing window focus
Classification: Plasma
Product: Breeze
Version: 5.90.0
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Color scheme
Assignee: plasma-b...@kde.org
Reporter: adam.m.fontenot+...@gmail.com
Target Milestone: ---
Created attachment 164302
--> https://bugs.kde.org/attachment.cgi?id=164302&action=edit
screencast of the problem
SUMMARY
I'm reporting this against the Breeze theme because it shows the issue well and
degrades the out-of-the-box KDE experience significantly.
If there's a problem in KWin that's causing this, it may also be noticeable in
other themes that like Breeze Light (a) have separate window colors for focused
vs unfocused windows, and (b) set the title bar to the same color as the window
background in at least one of those states.
STEPS TO REPRODUCE
1. Set your global theme to e.g. Breeze or Breeze Twilight, which should mean
you have the Breeze Light color scheme set.
2. Change focus between two windows. It will make the problem much more obvious
if you use hover to focus, because focus changing will happen much more often
in your routine use of the computer. This *should* be optional though.
OBSERVED RESULT
Frequently (but not always), the window's title bar will be repainted (to the
"inactive" colors) one or more frames earlier than the window background will
be repainted. This causes a noticeable flickering / strobing effect that
bothers me quite a lot, enough so that I changed my theme colors, and might go
so far as to be an accessibility issue for some.
My partner also uses KDE. Their computer is significantly slower than mine and
the strobing effect is *greatly* exacerbated by this. To my eye it can be ~0.2
seconds or so before the window colors are back in sync. It's really bad
looking. Those on brand new systems with high powered graphics might not notice
it, but it seems to be a serious problem for old laptops.
My personal workaround is shown in the screencast. In the first half of the
video, I toggle the focus while using a custom color scheme that doesn't change
the inactive window colors. Then I switch the colors to Breeze Light and show
the bug.
EXPECTED RESULT
The window background should be repainted in the same frame as the title bar
100% of the time with no exceptions.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.90.0
KDE Frameworks Version: 5.246.0
Qt Version: 6.6.1
Kernel Version: 6.6.7-arch1-1 (64-bit)
Graphics Platform: Wayland
ADDITIONAL INFORMATION
This isn't a new issue, it's one of those design nits that has bothered me for
years and I found a workaround a long time ago (I quit using Breeze colors).
I'm reporting it now just because there's a lot of polishing happening for
Plasma 6 and I thought someone might want to take a look.
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