Bug 515828

Summary: Scrollbar behaves weirdly when the cursor holding it goes out of the scrollbar's area
Product: [Plasma] kwin Reporter: Fernando Marcelino Muniz <fernandommuniz>
Component: generalAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED UPSTREAM    
Severity: normal CC: xaver.hugl
Priority: NOR Keywords: usability
Version First Reported In: 6.5.5   
Target Milestone: ---   
Platform: CachyOS   
OS: Linux   
URL: https://bugzilla.mozilla.org/show_bug.cgi?id=2014504#c2
See Also: https://bugs.kde.org/show_bug.cgi?id=515827
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Fernando Marcelino Muniz 2026-02-10 17:07:30 UTC 
STEPS TO REPRODUCE
On this site, hold the scrollbar of "Platform:", then move the cursor away from the list.

OBSERVED RESULT
The scrollbar teleports to the bottom the moment the cursor (while holding the scrollbar) goes out of the list.

EXPECTED RESULT
It should behave like it does with all other scrollbars.
(Solving this on the site's end wouldn't truly solve the issue)

SOFTWARE/OS VERSIONS
Operating System: CachyOS Linux 
KDE Plasma Version: 6.5.5
KDE Frameworks Version: 6.22.0
Qt Version: 6.10.2
Kernel Version: 6.18.9-2-cachyos (64-bit)
Graphics Platform: Wayland
Processors: 8 × 11th Gen Intel® Core™ i5-11300H @ 3.10GHz
Memory: 9 GB of RAM (8.1 GB usable)
Graphics Processor 1: Intel® Iris® Xe Graphics
Graphics Processor 2: NVIDIA GeForce GTX 1650
Manufacturer: LENOVO
Product Name: 82MG
System Version: IdeaPad Gaming 3 15IHU6

ADDITIONAL INFORMATION
https://bugzilla.mozilla.org/show_bug.cgi?id=2014504#c2
Comment 1 Zamundaaa 2026-02-10 20:40:34 UTC 
KWin doesn't render scrollbars, this too is a Firefox (or maybe GTK) issue.