Bug 488950

Summary: Seams in window decoration when using an Aurorae window decoration theme other than Breeze or Plastik in Wayland at any scaling other than 100%
Product: [Plasma] kwin Reporter: Justin Wayland <justintwayland>
Component: auroraeAssignee: KWin default assignee <kwin-bugs-null>
Status: REPORTED ---    
Severity: normal CC: kde.rely203, mathispaquet362
Priority: NOR    
Version First Reported In: 6.0.5   
Target Milestone: ---   
Platform: openSUSE   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: The pixel wide seam introduced when using an Aurorae theme. Screenshotted where most visible
100% (or no) scaling
125% scaling
200% scaling

Description Justin Wayland 2024-06-22 04:57:20 UTC
Created attachment 170797 [details]
The pixel wide seam introduced when using an Aurorae theme. Screenshotted where most visible

SUMMARY
There is a small pixel wide seam in Aurorae themes other than Breeze or Plastik.  This can be seen in the attached photo, which was taken at 200%, ruling fractional scaling as a source of error.

STEPS TO REPRODUCE
1. Download the Relax-Aurorae window decoration theme. (Or really, any theme).
2. Set the downloaded theme as the current window decoration theme in System Settings.
3. Close System Settings.
4. Open any application that uses Qt 6.

OBSERVED RESULT
A pixel wide seam appears above the rounded corners.

EXPECTED RESULT
There should be no pixel-wide seam.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 6.9.5-1
(available in About System)
KDE Plasma Version: 6.0.5
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.1
Comment 1 Justin Wayland 2024-06-24 20:04:20 UTC
This still occurs on 6.1.0.
Comment 2 Mathis Paquet 2024-10-04 16:00:50 UTC
I also have this issue, but it happens only for some window sizes. If I change the size of the window just a little bit, it goes away.
Comment 3 kde.rely203 2025-10-20 21:41:28 UTC
Created attachment 185939 [details]
100% (or no) scaling
Comment 4 kde.rely203 2025-10-20 21:42:05 UTC
Created attachment 185940 [details]
125% scaling
Comment 5 kde.rely203 2025-10-20 21:42:39 UTC
Created attachment 185941 [details]
200% scaling
Comment 6 kde.rely203 2025-10-20 21:56:16 UTC
I as well have this issue. The decoration seams and the decoration SVGs themselves are affected. I would like to add that it is very noticeable on a QHD (2560x1440) monitor, less so on a HD (1920x1080). I have attatched three pictures showing the difference with each setting on the QHD monitor. Every Aurorae decoration I tried broke under any scaling. I spent hours checking to see if any other settings affected this and I could not find any.

Specs:
Operating System: Arch Linux
Kernel: Linux 6.12.53-1-lts
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.19.0
Qt Version: 6.10.0
Kernel Version: 6.12.53-1-lts (64-bit)
Graphics Platform: Wayland
Nvidia Driver Version: 580.95.05