Bug 441625

Summary:	Visual glitches for a moment when editing list of virtual desktops
Product:	[Plasma] kwin	Reporter:	Alexander Potashev <aspotashev>
Component:	general	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	CONFIRMED ---
Severity:	minor	CC:	nate, plasma-bugs
Priority:	NOR	Flags:	vlad.zahorodnii: Wayland- vlad.zahorodnii: X11+
Version:	git master
Target Milestone:	---
Platform:	Neon
OS:	Linux
Latest Commit:		Version Fixed In:

Description Alexander Potashev 2021-08-27 20:10:34 UTC

SUMMARY
Black screen for a moment when editing list of virtual desktops.

STEPS TO REPRODUCE
1. Open virtual desktops KCM
2. Add another virtual desktop
3. Click Apply

OBSERVED RESULT
Black screen for 1 second, then it restores. Not sure when happens, maybe Plasma restarts.

EXPECTED RESULT
Should only have immediate effect on the Virtual Desktops Pager widget.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Neon
(available in About System)
KDE Plasma Version: 5.22.80
KDE Frameworks Version: 5.86.0
Qt Version: 5.15.3

ADDITIONAL INFORMATION
X; xcb

Comment 1 Nate Graham 2021-08-28 02:18:41 UTC

Cannot reproduce exactly, but there are a few flickers for me with the panel and window decorations though. Seems like KWin reloads some stuff when it creates a new virtual desktop, which is causing these momentary visual glitches.

Comment 2 Alexander Potashev 2021-08-31 20:20:42 UTC

> Black screen for 1 second, then it restores.

Fun fact: the same doesn't happen for me on Wayland.