Stops all running animations for @region_id and all animatable
regions underneath.
A %NULL @region_id will stop all ongoing animations in @context,
when dealing with a #GtkStyleContext obtained through
gtk_widget_get_style_context(), this is normally done for you
in all circumstances you would expect all widget to be stopped,
so this should be only used in complex widgets with different
animatable regions.
Stops all running animations for @region_id and all animatable regions underneath.
A %NULL @region_id will stop all ongoing animations in @context, when dealing with a #GtkStyleContext obtained through gtk_widget_get_style_context(), this is normally done for you in all circumstances you would expect all widget to be stopped, so this should be only used in complex widgets with different animatable regions.