417757eab8
A xdg_popup, when active, always has a parent surface. However, a popup created may immediately become invalid, for example when it is not granted a grab, in which case it won't be assigned a parent since it will never be mapped. This case needs to be handled elsewhere, as one cannot assume a MetaWaylandXdgPoup that is processed (via wl_surface commit handling etc) will have a parent_surface. https://bugzilla.gnome.org/show_bug.cgi?id=771495