I've bound M-d to kwin's focus desktop. When I press it I get remnants of the minimized windows in all the four screen corners. First I thought it was a gfx driver issue, but I've verified it on both Intel and Radeon cards with KDE 5. I've also tried changing the compositing backend but it doesn't change anything. Perhaps it is intentional, if so could you add an option to disable it? Because the effect doesn't look good and IMHO more like a graphics bug. Screenshot coming up. Reproducible: Always
Created attachment 95878 [details] screenie top left you see dolphin, top right you see konsole
This is indeed expected behavior. You can disable this effect by disabling the "Window Aperture" effect in systemsettings.
Oh I see, so dupe of #347281 then.
*** This bug has been marked as a duplicate of bug 347281 ***