Bug 514820

Summary:	Icons-Only Task Manager Preview flashes and occupies the whole screen
Product:	[Plasma] plasmashell	Reporter:	Jesse Nobbe <jesse.nobbe>
Component:	Icon widget	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	REPORTED ---
Severity:	normal	CC:	akselmo
Priority:	NOR
Version First Reported In:	6.5.5
Target Milestone:	1.0
Platform:	EndeavourOS
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	Popup with preview in the center taking over the whole screen. Popup with description in the center taking over the whole screen. Screen flashing when hovering over the Application Menu.

Description Jesse Nobbe 2026-01-19 06:39:29 UTC

SUMMARY

When hovering over an icon, the preview area will take up the entire screen with the actual preview centered in the popup window. This will happen whether the option, "Show small window previews when hovering over tasks" is checked or not. Additionally (possibly a separate bug) hovering over other elements of the panel will cause the screen to flash repeatedly for example hovering over the Application Menu.


STEPS TO REPRODUCE
1. Add the Icons-Only Task Manager to your panel.
2. Hover over different open windows.

OBSERVED RESULT
A preview area covering the entire screen appears with either a small preview or no preview if the "Show small window previews when hovering over tasks" option is disabled.

EXPECTED RESULT
A small popup over the hovered icon.


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: EndeavourOS 
KDE Plasma Version: 6.5.5
KDE Frameworks Version: 6.22.0 
Qt Version: 6.10.1

ADDITIONAL INFORMATION
Kernel: 6.12.66-1-lts (64-bit)
Graphics Platform: Wayland

Other people having the same issue:
* https://redlib.catsarch.com/r/kde/comments/1oz5mcg/why_does_the_thumbnail_preview_cover_the_entire/
* https://redlib.catsarch.com/r/kde/comments/1qbspmj/bug_window_previews_take_up_the_the_entire_screen/

Comment 1 Jesse Nobbe 2026-01-19 06:41:42 UTC

Created attachment 188673 [details]
Popup with preview in the center taking over the whole screen.

Comment 2 Jesse Nobbe 2026-01-19 06:42:17 UTC

Created attachment 188674 [details]
Popup with description in the center taking over the whole screen.

Comment 3 Jesse Nobbe 2026-01-19 06:47:57 UTC

Created attachment 188676 [details]
Screen flashing when hovering over the Application Menu.

Comment 4 Akseli Lahtinen 2026-01-19 12:04:53 UTC

I am unable to repro this on KDE Linux

Operating System: KDE Linux 2026-01-18
KDE Plasma Version: 6.6.80
KDE Frameworks Version: 6.23.0
Qt Version: 6.10.1
Kernel Version: 6.18.5-zen1-1-zen (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 3600 6-Core Processor
Memory: 16 GiB of RAM (15,5 GiB usable)
Graphics Processor: AMD Radeon RX 6600