Bug 512306

Summary: Arrows of the scroll bar of Vivaldi browser are missing
Product: [Plasma] kwin Reporter: Patrick Silva <bugseforuns>
Component: coreAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED UPSTREAM    
Severity: normal CC: kdedev, xaver.hugl
Priority: NOR    
Version First Reported In: 6.5.3   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: screenshot of Vivaldi taken on Plasma 6.5.3
screenshot of Vivaldi taken on Gnome 49

Description Patrick Silva 2025-11-18 18:41:07 UTC
Created attachment 186930 [details]
screenshot of Vivaldi taken on Plasma 6.5.3

SUMMARY
I can reproduce with Vivaldi and Chromium browsers. I think this can be a bug in KDE software because I'm unable to reproduce with the same version of Vivaldi on Fedora 43 running Gnome 49.

STEPS TO REPRODUCE
1. install Vivaldi or Chromium on a operating system running KDE Plasma DE
2. open the installed browser
3. load a long webpage
4. observe the scroll bar

OBSERVED RESULT
scroll bar without arrows. Please compare the attached screenshots.

EXPECTED RESULT
scroll bar with arrows, like on Gnome 49

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.5.3
KDE Frameworks Version: 6.20.0
Qt Version: 6.10.0
Graphics Platform: Wayland
Comment 1 Patrick Silva 2025-11-18 18:41:40 UTC
Created attachment 186931 [details]
screenshot of Vivaldi taken on Gnome 49
Comment 2 TraceyC 2025-11-20 18:56:45 UTC
Thanks for the bug report. I don't see the bug on Plasma built from git-master or 6.5.3

Can you confirm the bug exists with one of the default Breeze icon themes?

Moving to kwin, which draws windows
Comment 3 Patrick Silva 2025-11-20 19:08:49 UTC
I can reproduce with default Breeze icon theme. Can also reproduce with Oxygen, Papirus, McMojave circle and Newaita-reborn icon themes.
Comment 4 Zamundaaa 2025-11-27 21:12:16 UTC
If it happens with multiple themes, it's almost certainly something Chromium does wrong, not something we can fix.

(In reply to TraceyC from comment #2)
> Moving to kwin, which draws windows
Do note that KWin draws window decorations, but merely *copies* window contents to the screen. It doesn't draw anything into windows, that's entirely up to each application.