Got bothered by the blocky look on highdpi, looks a lot nicer :)
Somehow the Adwaita theme here doesn't load properly.
object-rotate-left and object-rotate-right are part of the FDO icon name spec [1].
Before
After (Breeze)
After (Oxygen)
The check for whether we got a fallback to object-rotate or object (which we don't want here) does not work due to a bug in KIconEngine, cf. https://bugs.kde.org/show_bug.cgi?id=432293 – QIcon::name() always returns whatever you passed in even if the icon you got didn't actually go by that name.