Created attachment 155376 [details] Artefacts when opening a panel popup over Konsole SUMMARY I can see some weird artefacts with the blur effect when some element is over a blurred region. The artefact is like showing the outline of the redrawn portions. It can be more clear if you watch the attached videos. STEPS TO REPRODUCE 1. Open an application which has background blur enabled (for example Konsole with blur background). 2. Move the window closer to the panel & open any panel item. Then you can see the weird artefacts. 3. This can also be tested using the "Mouse Mark" desktop effect. Just draw over a blurred region. OBSERVED RESULT Weird artefacts are seen. EXPECTED RESULT No artefacts should be there. SOFTWARE/OS VERSIONS Linux/KDE Plasma: 5.15.88-1-LTS (64-bit) KDE Plasma Version: 5.26.5 KDE Frameworks Version: 5.102.0 Qt Version: 5.15.8 ADDITIONAL INFORMATION This happens on both the X11 and Wayland versions of Kwin. My GPU is Intel with Mesa drivers.
Created attachment 155377 [details] Artefacts when using Mouse Mark over Konsole
Same for me SOFTWARE/OS VERSIONS Operating System: Arch Linux KDE Plasma Version: 5.27.4 KDE Frameworks Version: 5.105.0 Qt Version: 5.15.9 Graphics Platform: X11 Graphics Processor: AMD Radeon Graphics
*** This bug has been marked as a duplicate of bug 465158 ***