khintssettings: Call QWindowSystemInterface::handleThemeChange on icon theme change
It seems in Qt 6 we need to explicitly call this in order for icon theme change to propagate immediately. Otherwise only icons that get repainted (e.g. as you hover or (un)focus a window) will update live.
Needs breeze!490 (merged) or else it’ll break Breeze
With this, switching icon theme has Dolphin’s toolbar and places panel update live and not only as I hover the individual controls.
Edited by Kai Uwe Broulik