Bug 463054

Summary:	With horizontal panel, wide scrollable Thumbnail list not scrollable with scroll wheel on Wayland
Product:	[Plasma] plasmashell	Reporter:	iodreamify
Component:	Task Manager and Icons-Only Task Manager	Assignee:	Plasma Bugs List <plasma-bugs>
Status:	CONFIRMED ---
Severity:	minor	CC:	nate, unblended_icing552
Priority:	NOR	Keywords:	wayland
Version:	5.26.4
Target Milestone:	1.0
Platform:	Arch Linux
OS:	Linux
See Also:	https://bugs.kde.org/show_bug.cgi?id=448504
Latest Commit:		Version Fixed In:

Description iodreamify 2022-12-15 00:51:15 UTC

SUMMARY
With a horizontal panel, if you open too many windows and the thumbnail list in the icon-only task manager no longer fits on the screen so it gets a horizontal scrollbar, the usual mouse wheel shortcut for scrolling doesn't work anymore(i believe this is a regression and you used to be able to do this, or at least you could drag the thumbnails with the mouse pointer itself). The only way to scroll is to drag the scrollbar with the mouse. 

Scrolling with a vertical panel works. 

Also tested on X11: if i hold down Alt and scroll with the mouse wheel it does scroll. 
On Wayland no shortcuts work.       

STEPS TO REPRODUCE
1. Fill up icon only task manager with many thumbnails so it gets a scrollbar
2. Hover over one of the thumbnails.
3. Try to scroll with the mouse wheel.

OBSERVED RESULT
Nothing happens

EXPECTED RESULT
The thumbnails scroll horizontally

Operating System: Arch Linux
KDE Plasma Version: 5.26.4
KDE Frameworks Version: 5.101.0
Qt Version: 5.15.7
Kernel Version: 6.0.12-arch1-1 (64-bit)
Graphics Platform: Wayland
Graphics Processor: Mesa Intel® HD Graphics 3000

Comment 1 Nate Graham 2022-12-15 19:15:06 UTC

Can confirm.