compositor: Stop repainting below opaque surfaces
compositor: Stop repainting below opaque surfaces

xorgy/weston,Tarnyko/weston-xdg_surface_present,Gnurou/weston,eyolfson/weston,jonnylamb/weston,giucam/weston,kwm81/weston,xorgy/weston,Gnurou/weston,krezovic/weston,sir-murray/weston,udoprog/weston,eyolfson/weston,Tarnyko/weston-xdg_surface_present,udoprog/weston,mchalupa/weston,sir-murray/weston,Fantu/compositor-spice,Fantu/compositor-spice,Fantu/compositor-spice,krezovic/weston,kwm81/weston,giucam/weston,jonnylamb/weston,mchalupa/weston