Bug 484427

Summary:	Transparency 'saved' of multiple closed windows to form a composite desktop background
Product:	[Plasma] kwin	Reporter:	Randy <hizaira>
Component:	effects-various	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	REPORTED ---
Severity:	normal	CC:	hizaira, michael
Priority:	NOR
Version First Reported In:	6.0.2
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	Image attached is actually of desktop. Those windows are closed.

Description Randy 2024-03-25 02:24:14 UTC

Created attachment 167721 [details]
Image attached is actually of desktop. Those windows are closed.

SUMMARY
***
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***


STEPS TO REPRODUCE
1. Settings->Window Management->Desktop Effects->Translucency->Configure Settings
2. On all 5 settings set to approx 80%
3.  Apply and use.

OBSERVED RESULT
Transparency 'saved' of multiple closed windows to form a composite desktop background  which is additive to the original background AND will follow to other virtual desktops. Opening and closing the apps and refreshing screen (F5) does not repair background. Does not effect operation of apps.

Changing the background image still composites the old open windows on new background image.

EXPECTED RESULT
When windows are closed no remnant of them should be used.  By Remnant Think after image masked onto the background image.

SOFTWARE/OS VERSIONS
--------------- 
OS: Arch Linux x86_64 
Host: 20FRS34200 ThinkPad X1 Yoga 1st 
Kernel: 6.8.1-arch1-1 
Uptime: 2 hours, 18 mins 
Packages: 1153 (pacman) 
Shell: bash 5.2.26 
Resolution: 2560x1440 
DE: Plasma 6.0.2 
WM: kwin 
Theme: Breeze-Dark [GTK2], Breeze [GTK3] 
Icons: breeze-dark [GTK2/3] 
Terminal: alacritty 
CPU: Intel i7-6600U (4) @ 3.400GHz 
GPU: Intel Skylake GT2 [HD Graphics 520] 
Memory: 3733MiB / 15852MiB 

ADDITIONAL INFORMATION
please ask, glad to help your awesome software!

Comment 1 Michael Butash 2024-05-05 19:28:53 UTC

I was going to open a ticket on this too, just testing some of the Desktop Effects of Plasma 6.0.  I used to use Translucency in 5.27 and before various time, but too buggy to use regularly, but seems about the same issues still in 6.0.

Same issue that if I enable Translucency and minimize windows, they leave a "ghost" effect of the translucent window there still once minimized, effectively leaving clutter on the desktop I can't click on, but appears to still be there.  This doesn't happen with native QT-based windows for KDE windows or firefox, but does for libreoffice, virtualbox, electron apps like slack or signal, anything seemingly NOT QT or otherwise avoiding the issue like Firefox somehow.

This is on arch linux with plasma 6.0.4, not sure really what to provide aside from screen shots and system versions, but glad to do so if something to look for helps resolve and make this usable again.

I used to love to use Translucency effects, but it's always been buggy that I can't use it for long, and I believe this ghosting might have been present from the last time I tried under plasma 5.x, but definitely present in 6.0.