Bug 474196

Summary: The blur effect does not work in Konsole when moving a window if the "Wobbly Window" effect is enabled
Product: [Plasma] kwin Reporter: Жора Змейкин <katze_942>
Component: effects-variousAssignee: KWin default assignee <kwin-bugs-null>
Status: CONFIRMED ---    
Severity: normal CC: f.alexander.wilms, fallenhvh, goodaqua, im.tech.tac, jonas.harer, julien.dlq, lukinbogdan79, ManuelBoe, mat.mueller, shibisjm
Priority: NOR    
Version First Reported In: 6.1.5   
Target Milestone: ---   
Platform: unspecified   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:
Attachments: Demonstration

Description Жора Змейкин 2023-09-05 21:22:29 UTC
Created attachment 161425 [details]
Demonstration

SUMMARY
In Konsole, you can create a profile with a semi-transparent background and with it blurred. Everything works fine, exactly until you enable the "Wobbly window" effect in the KDE Plasma settings. Once enabled, any movement of the window causes the blurring to be disabled. After that it is restored, but it starts to flicker a lot.

STEPS TO REPRODUCE
1. Create a profile in Konsole with a transparent background and background blur.
2. Switch to this profile. 
3. Enable "Wobbly window" effect in settings (Settings -> Workspace Behavior -> Desktop Effects)
4. Move the Konsole window.

OBSERVED RESULT
Disabling blur, and afterward artifacts (blur starts flickering)

EXPECTED RESULT
The blur doesn't have to disappear. There should be no flickering.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux, Wayland
KDE Plasma Version: 5.27.7
KDE Frameworks Version: 5.109.0
Qt Version: 5.15.10

ADDITIONAL INFORMATION
Attached is a video demonstration.
Comment 1 Жора Змейкин 2023-09-05 21:29:12 UTC
I checked, this applies to all applications that use blur. So it's fair to edit the post and move it to the kwin group
Comment 2 Matthias Mueller 2024-04-14 16:10:32 UTC
Can confirm this (minus the flickering).

Plasma 6.0.3
KF 6.0.0
QT 6.7.0
ArchLinux on AMDGPU
Comment 3 reports_go_brrr 2024-09-19 19:15:07 UTC
Can reproduce it.

Operating System: Arch Linux 
KDE Plasma Version: 6.1.5
KDE Frameworks Version: 6.5.0
Qt Version: 6.7.2
Kernel Version: 6.10.7-arch1-1 (64-bit)
Graphics Platform: Wayland
Comment 4 ManuelBoe 2025-02-10 18:04:15 UTC
It affects every Window, where some kind of blur(window decorations and application styles) are enabled.
Comment 5 jonas.harer 2025-06-15 19:56:25 UTC
*** Bug 456473 has been marked as a duplicate of this bug. ***
Comment 6 jonas.harer 2025-06-15 20:04:22 UTC
I can reproduce it on Plasma 6.3 on Arch.
Comment 7 jonas.harer 2025-06-15 20:07:26 UTC
It does not only occur, if the "Wobbly Window" effect is enabled, but also if another animation, like maximize, is running.
Comment 8 Tech-Tac 2025-07-03 18:09:16 UTC
Can reproduce on Plasma 6.4.1