Bug 511770

Summary: Invisible interaction gap in window titlebar at 125% scale
Product: [Plasma] Breeze Reporter: oqwert
Component: window decorationAssignee: Plasma Bugs List <plasma-bugs-null>
Status: REPORTED ---    
Severity: normal CC: kwin-bugs-null, uhhadd
Priority: NOR    
Version First Reported In: 6.5.1   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: Cursor located under window titlebar highlights obstructed folder behind it

Description oqwert 2025-11-07 12:37:04 UTC
Created attachment 186582 [details]
Cursor located under window titlebar highlights obstructed folder behind it

SUMMARY
There appears to be a tiny, invisible gap that allows unintended interactions with things behind scaled window titlebars.

STEPS TO REPRODUCE
1. Set display configuration scale to 125%
2. Open a window
3. Place the window so that the titlebar partially overlaps an interactable element in another background window, particularly something that reacts to mouseovers such as a folder
4. Move your cursor below the window title text

OBSERVED RESULT
The folder will be briefly highlighted as if it detected a mouseover and will be interactable despite being visually obstructed, allowing unintended interactions when dragging windows around.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux (Wayland)
KDE Plasma Version: 6.5.1
KDE Frameworks Version: 6.19.0
Qt Version: 6.10.0
Comment 1 oqwert 2025-12-01 13:10:31 UTC
The gap is 1px high and spans the entire width of the window.