dece49b53d
Being a "XWayland window" should be considered equivalent to a role, even though it is not part of any protocol anywhere. The commit doesn't have any functional difference, but just makes it clear that an wl_surface managed by XWayland have the same type of special casing as surface roles as defined by the Wayland protocol. As the semantics are more explicit given the role is defined, a comment explaining why the semantics need to be how they are was added. https://bugzilla.gnome.org/show_bug.cgi?id=744932