shell: Give keyboard focus to top surface when current keyboard focus goes away
shell: Give keyboard focus to top surface when current keyboard focus goes away

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