Bug 471076

Summary:	Folder view widget popup can lag or freeze when dragging scroll handle quickly in a folder with many items with previews enabled
Product:	[Plasma] plasmashell	Reporter:	me
Component:	Desktop icons & Folder View widget	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	CONFIRMED ---
Severity:	normal	CC:	aspotashev, hein, nate
Priority:	NOR
Version First Reported In:	5.27.5
Target Milestone:	1.0
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description me 2023-06-15 13:07:34 UTC

SUMMARY
I have a folder view widget in my panel that points to my downloads folder (which has a lot of files in case that could be an issue) and when I scroll either with the scrollbar or the mouse scroll wheel the whole shell starts to lag and freeze.

STEPS TO REPRODUCE
1. Have a folder view widget with a relatively long file list
2. Scroll far

OBSERVED RESULT
The whole shell lags and freezes.

EXPECTED RESULT
The widget should scroll normally.

SOFTWARE/OS VERSIONS
Linux: Arch Linux with zen kernel 6.3.6
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.106.0
Qt Version: 5.15.9

ADDITIONAL INFORMATION
Only seems to happen under Wayland; the problem occurs also with the folder view set to "list" rather than "grid"; another little bug is the cursor that gets stuck in a position (e.g. the arrow with the plus symbol or the closed hand cursor) when hovering on a panel or widget after the folder view causes lagging.

Comment 1 me 2023-06-15 13:08:48 UTC

Screen recording of the problem: https://static.gianmarco.gg/folderviewlag.mp4

Comment 2 Nate Graham 2023-09-15 16:26:34 UTC

Can reproduce lagginess and even brief freezing when dragging the scroll handle with the popup in Grid view. List view seems to work much better for me.

Comment 3 me 2023-10-02 14:58:20 UTC

(In reply to Nate Graham from comment #2)
> Can reproduce lagginess and even brief freezing when dragging the scroll
> handle with the popup in Grid view. List view seems to work much better for
> me.

The list view has the same issue for me.