Bug 510889 - The icon of a gtk4 app looks blurry in the Large Icons task switcher
Summary: The icon of a gtk4 app looks blurry in the Large Icons task switcher
Status: RESOLVED UPSTREAM
Alias: None
Product: kwin
Classification: Plasma
Component: tabbox (other bugs)
Version First Reported In: unspecified
Platform: Arch Linux Linux
: NOR normal
Target Milestone: ---
Assignee: KWin default assignee
URL: https://gitlab.gnome.org/GNOME/gtk/-/...
Keywords:
Depends on:
Blocks:
 
Reported: 2025-10-21 22:45 UTC by Patrick Silva
Modified: 2025-10-25 10:14 UTC (History)
1 user (show)

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

Attachments
screenshot (146.40 KB, image/png)
2025-10-21 22:45 UTC, Patrick Silva 		Details
View All Add an attachment

Note You need to log in before you can comment on or make changes to this bug.
Description Patrick Silva 2025-10-21 22:45:20 UTC 
Created attachment 185979 [details]
screenshot

STEPS TO REPRODUCE
1. set Large Icons task switcher in Task Switcher KCM
2. open any app and a gtk4 app - on my system I can reproduce with Showtime video player and Swell Foop game
3. press alt+tab and do not release the alt key
4. observe the icons in the Large Icons task switcher

OBSERVED RESULT
the icon of the gtk4 app looks blurry. Please see the attached screenshot.

EXPECTED RESULT
crisp icon

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.5.0
KDE Frameworks Version: 6.19.0
Qt Version: 6.10.0
Graphics Platform: Wayland
Comment 1 Zamundaaa 2025-10-23 13:02:48 UTC 
I checked with WAYLAND_DEBUG=1; GTK sets the icon using xdg_toplevel_icon_v1, and it specifically only sets the icon as a single fixed-size buffer and not as an icon name. So there's nothing we can do about this, please report this to GTK
Comment 2 Patrick Silva 2025-10-25 10:14:42 UTC 
Reported:
https://gitlab.gnome.org/GNOME/gtk/-/issues/7845

Reading Mathias's comment, probably it will not be fixed. :(