Bug 515812

Summary: breeze kdecoration: rounding the outline of the lower corners in cases where it should not be
Product: [Plasma] Breeze Reporter: Sergey Katunin <sulmpx60>
Component: window decorationAssignee: Plasma Bugs List <plasma-bugs-null>
Status: CONFIRMED ---    
Severity: minor CC: akselmo, kwin-bugs-null, uhhadd
Priority: NOR    
Version First Reported In: unspecified   
Target Milestone: ---   
Platform: Other   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: Example 1
Example 2
Example 3

Description Sergey Katunin 2026-02-10 11:35:17 UTC 
SUMMARY

An example of such a case is when the rounding of the lower corners is enabled with no borders, and the window is magnetized to one edge of the monitor screen.

In this case, the rounding of the lower corner itself is turned off, but the rounding of the outline remains.

Overall, this is an minor problem, but still a visual flaw.

P.S I also wanted to suggest turning off the rounding of all four corners altogether (including disabling the rounding of the titlebar and of outline) - for such cases when the window is magnetized to one of the edges of the screen.

I've done this technically and can send a merge request, but I'm not sure if the developers will agree with this idea.

STEPS TO REPRODUCE
1. Enable Breeze window decoration
2. Enable rounding of the lower corners and 'no borders'
3. Magnetize the window to one of the edges of the monitor

OBSERVED RESULT

The outline is rounded, but one of the lower corners is not rounded.

EXPECTED RESULT

The outline of this corner should also not be rounded if the corner is not rounded.

SOFTWARE/OS VERSIONS

Operating System: KDE neon Unstable Edition
KDE Plasma Version: 6.6.80
KDE Frameworks Version: 6.24.0
Qt Version: 6.10.1
Kernel Version: 6.17.0-14-generic (64-bit)
Graphics Platform: Wayland
Comment 1 Sergey Katunin 2026-02-10 11:35:53 UTC 
Created attachment 189434 [details]
Example 1
Comment 2 Sergey Katunin 2026-02-10 11:36:02 UTC 
Created attachment 189435 [details]
Example 2
Comment 3 Sergey Katunin 2026-02-10 11:36:12 UTC 
Created attachment 189436 [details]
Example 3
Comment 4 Akseli Lahtinen 2026-02-10 12:17:19 UTC 
Can confirm, since the tiling thing disables corner borders.

Operating System: KDE Linux 2026-02-09
KDE Plasma Version: 6.6.80
KDE Frameworks Version: 6.24.0
Qt Version: 6.10.2
Kernel Version: 6.18.7-zen1-1-zen (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 3600 6-Core Processor
Memory: 16 GiB of RAM (15.5 GiB usable)
Graphics Processor: AMD Radeon RX 6600