Fix pointer position clipping.
Fix pointer position clipping.

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