Bug 466678

Summary:	Missing icon sizes are replaced with different higher-res versions at 100% and 200% screen scale
Product:	[Frameworks and Libraries] frameworks-kiconthemes	Reporter:	Alexander Wilms <f.alexander.wilms>
Component:	general	Assignee:	Christoph Feck <cfeck>
Status:	CONFIRMED ---
Severity:	normal	CC:	kdelibs-bugs-null, nate
Priority:	NOR
Version First Reported In:	5.103.0
Target Milestone:	---
Platform:	Other
OS:	Linux
See Also:	https://bugs.kde.org/show_bug.cgi?id=466630
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	Cuttlefish screenshot of system-switch-user icon at 100% scale on Wayland Cuttlefish screenshot of system-switch-user icon at 200% scale on Wayland Cuttlefish screenshot of system-switch-user icon at 100% scale on X11 Cuttlefish screenshot of system-switch-user icon at 200% scale on X11

Description Alexander Wilms 2023-03-01 20:43:17 UTC

SUMMARY
The Breeze icon theme does not contain a 16 px version of the system-switch-user icon. Therefore, a higher-resolution icon is scaled down and used when a 16 px version of this icon is requested. The resolution of the original icon that's used as a placeholder differs depending on the used graphics platform. At 100% scale, the 22 px icon is scaled to 16 px and at 200% scale, the 32 px icon is scaled to 16 px.

This issue was discovered while investigating https://bugs.kde.org/show_bug.cgi?id=466630

STEPS TO REPRODUCE
1. Set screen scale to 100% under "System settings > Display and Monitor > Display Configuration > Scale"
2. Open the icon viewer cuttlefish
3. Search system-switch-user icon
4. Set screen scale to 200%
5. Log out and back in
5. Open the icon viewer cuttlefish
6. Search system-switch-user icon

OBSERVED RESULT
The 16 px versions of the icon differ based on the screen scale used.

EXPECTED RESULT
The icons always look identical at a particular size

SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20230228
KDE Plasma Version: 5.27.1
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
Kernel Version: 6.1.12-1-default (64-bit)
Graphics Platform: Wayland


ADDITIONAL INFORMATION

Comment 1 Alexander Wilms 2023-03-01 20:44:45 UTC

Created attachment 156895 [details]
Cuttlefish screenshot of system-switch-user icon at 100% scale on Wayland

Comment 2 Alexander Wilms 2023-03-01 20:44:58 UTC

Created attachment 156896 [details]
Cuttlefish screenshot of system-switch-user icon at 200% scale on Wayland

Comment 3 Alexander Wilms 2023-03-01 20:45:15 UTC

Created attachment 156897 [details]
Cuttlefish screenshot of system-switch-user icon at 100% scale on X11

Comment 4 Alexander Wilms 2023-03-01 20:45:27 UTC

Created attachment 156898 [details]
Cuttlefish screenshot of system-switch-user icon at 200% scale on X11

Comment 5 Nate Graham 2023-03-02 20:10:49 UTC

Can reproduce. It's weird.

Comment 6 Alexander Wilms 2023-03-02 20:15:52 UTC

This part of the original report is wrong:

"The resolution of the original icon that's used as a placeholder differs depending on the used graphics platform."

The placeholder depends on the screen scale, not the graphics platform.