Bug 485894

Summary:	Animated wallpapers don't play on the lockscreen when there is a maximized window
Product:	[Plasma] plasmashell	Reporter:	Ilya Bizyaev <bizyaev>
Component:	Screen locking	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	CONFIRMED ---
Severity:	normal	CC:	g.titor
Priority:	NOR
Version First Reported In:	6.2.4
Target Milestone:	1.0
Platform:	openSUSE
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Ilya Bizyaev 2024-04-21 11:50:31 UTC

SUMMARY
When using the same GIF as my wallpaper for both the desktop and the lockscreen, the animation will play on the desktop, but not on the lockscreen. The specific file doesn't seem to matter, you can test with this one: https://giphy.com/gifs/Windows-windows-clippy-microsoft-Ix6GpACnOfQ37CBAzq

STEPS TO REPRODUCE
1. Set an animated GIF image (or a folder with animated GIF images) as your lockscreen wallpaper.
2. Lock the screen (e.g. with Meta+L).

OBSERVED RESULT
The GIF does not play. The lockscreen is otherwise responsive, and images change when using a slideshow.

EXPECTED RESULT
Animated GIFs play on the lockscreen just like they do on the desktop.

SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20240418
KDE Plasma Version: 6.0.80
KDE Frameworks Version: 6.2.0
Qt Version: 6.7.0
Kernel Version: 6.8.6-1-default (64-bit)
Graphics Platform: Wayland

ADDITIONAL INFORMATION
On two random occasions in months, I've had GIFs play on the lockscreen! I don't know how to reproduce this success though :)

Comment 1 g.titor 2024-07-16 16:52:30 UTC

Have the same problem on Fedora 40 with KDE 6.1.2. Animated GIFs do not play on the lock screen if a window is maximized.

Comment 2 Ilya Bizyaev 2024-07-18 18:14:15 UTC

Oh thank you, that's a great find!

Comment 3 Ilya Bizyaev 2024-07-18 21:04:24 UTC

The cause is here: (“maximized window monitor”):
https://invent.kde.org/plasma/plasma-workspace/-/blob/d9d3c67b71bcc23635acb37534ed41eb09200518/wallpapers/image/imagepackage/contents/ui/mediacomponent/AnimatedImageComponent.qml#L38

It was likely intended to save resources by not animating wallpapers obscured by fullscreen windows, but it doesn't consider the lockscreen use case.