Bug 503180 - Visual artifact in applet expanding animation, when both Blur and Background Contrast are enabled
Summary: Visual artifact in applet expanding animation, when both Blur and Background ...
Status: RESOLVED FIXED
Alias: None
Product: kwin
Classification: Plasma
Component: effects-various (other bugs)
Version First Reported In: 6.3.4
Platform: Arch Linux Linux
: NOR normal
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2025-04-22 16:07 UTC by Jin Liu
Modified: 2025-10-14 16:33 UTC (History)
2 users (show)

See Also:
Latest Commit:
Version Fixed/Implemented In:
Sentry Crash Report:

Attachments
recording (995.84 KB, video/mp4)
2025-04-22 16:07 UTC, Jin Liu 		Details
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Description Jin Liu 2025-04-22 16:07:53 UTC 
Created attachment 180527 [details]
recording

SUMMARY

See attachment. During the expanding animation, there is a visual artifact at the bottom of the applet.
The height of the artifact is proportional to the "Blur Strength" setting.
The problem doesn't happen when only one of Blur or Background Contrast is enabled.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.3.4
KDE Frameworks Version: 6.13.0
Qt Version: 6.9.0
Kernel Version: 6.14.3-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 5600H with Radeon Graphics
Memory: 15.0 GiB of RAM
Graphics Processor: AMD Radeon Graphics
Comment 1 TraceyC 2025-04-22 19:20:21 UTC 
Thanks for the bug report and the screen recording, which clearly shows the visual effect

The applet in the screen recording is Application Launcher
I'm not seeing this in git-master (Qt 6.8.2) or Fedora 42 (Plasma 6.3.4 Qt 6.9.0)
I even slowed down animation speed, but still don't see it.

Does this happen with a brand new user?
Comment 2 Jin Liu 2025-04-23 01:22:28 UTC 
Yes it does happen with a brand new user.
Comment 3 TraceyC 2025-04-23 16:37:03 UTC 
Thanks for testing that. I'll let the more experienced kwin contributors take it from here.
Comment 4 Zamundaaa 2025-10-14 14:34:24 UTC 
I recall a similar bug being fixed in Plasma 6.4. Does this still happen for you there?
Comment 5 Jin Liu 2025-10-14 16:33:11 UTC 
Can confirm that it no longer happens in 6.5beta2.