Hi, I'm using a Mac Book with Retina and KDE really improved recently supporting HiDPI screens. Unfortunately Krunner still doesn't scale properly. It might be that the icons don't scale but have look at my screenshot. Reproducible: Always
Created attachment 94558 [details] Screenshot of krunner on my HiDPI screen.
Fixed in Plasma 5.6.5
*** Bug 337042 has been marked as a duplicate of this bug. ***