Bug 428575

Summary:	[Wayland] Extremely slow/choppy scrolling when I drag the scrollbar
Product:	[Frameworks and Libraries] frameworks-qqc2-desktop-style	Reporter:	Patrick Silva <bugseforuns>
Component:	general	Assignee:	Marco Martin <notmart>
Status:	RESOLVED FIXED
Severity:	normal	CC:	ahiemstra, aleixpol, justin.zobel, kde, nate, noahadvs
Priority:	NOR
Version First Reported In:	5.86.0
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:	https://invent.kde.org/frameworks/kirigami/-/commit/f6ca218607ff7e5d5066eb3224154c3256cb9516	Version Fixed In:	5.90
Sentry Crash Report:

Description Patrick Silva 2020-11-01 20:53:46 UTC

STEPS TO REPRODUCE
1. open Discover on Wayland session
2. click on "Applications" in the sidebar
3. scroll the applications list by dragging the scrollbar

OBSERVED RESULT
scrolling is extremely choppy/slow

EXPECTED RESULT
smooth scrolling

SOFTWARE/OS VERSIONS
Operating System: KDE neon Unstable Edition
KDE Plasma Version: 5.20.80
KDE Frameworks Version: 5.76.0
Qt Version: 5.15.0

Comment 1 Justin Zobel 2020-11-01 23:29:15 UTC

Confirmed on KDE Neon User Edition.

Comment 2 Patrick Silva 2021-02-13 15:19:38 UTC

Probably this bug should be re-assigned to another product.
I can also reproduce by scrolling a long list of window rules in Window Rules KCM.

Comment 3 Patrick Silva 2021-09-16 16:40:36 UTC

on Plasma 5.23 beta Discover even crashes after the provided steps.

Operating System: Arch Linux
KDE Plasma Version: 5.22.90
KDE Frameworks Version: 5.86.0
Qt Version: 5.15.2
Graphics Platform: Wayland

Comment 4 Aleix Pol 2021-09-23 21:40:58 UTC

TBH it's working remarkably well on my system. Can you provide a backtrace maybe?

Comment 5 Patrick Silva 2021-09-24 15:17:53 UTC

(In reply to Aleix Pol from comment #4)
> TBH it's working remarkably well on my system. Can you provide a backtrace
> maybe?

I see no crash notification and coredumpctl indicates no crash. Possibly it's another case of
"The Wayland connection experienced a fatal error: Invalid argument". :(

Comment 6 Nate Graham 2022-01-06 17:18:26 UTC

Scrolling issues were fixed by https://invent.kde.org/frameworks/kirigami/-/commit/f6ca218607ff7e5d5066eb3224154c3256cb9516; let's tracy any crashes in a new bug report, if they're still applicable.