Implement passive grabs on button clicks.
Implement passive grabs on button clicks.

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