text: Deactivate text_model on keyboard focus lost
text: Deactivate text_model on keyboard focus lost

Assign a surface to a text_model on the text_model_activate request and
deactivate the text_model when the surface looses the keyboard focus.

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