Create a sub-surface interface for the given surface, and
associate it with the given parent surface. This turns a
plain wl_surface into a sub-surface.
The to-be sub-surface must not already have another role, and it
must not have an existing wl_subsurface object. Otherwise a protocol
error is raised.
give a surface the role sub-surface
Create a sub-surface interface for the given surface, and associate it with the given parent surface. This turns a plain wl_surface into a sub-surface.
The to-be sub-surface must not already have another role, and it must not have an existing wl_subsurface object. Otherwise a protocol error is raised.