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d340c3a6dd
Don't unset the surface->buffer if the associated wl_buffer object is destroyed. The MetaWaylandBuffer doesn't really only represent a wl_buffer object, but also the data (texture) created from the given wl_buffer. Thus, for example destroying a released SHM wl_buffer should not destroy the MetaWaylandBuffer instance, because the texture may still be used. This commit also fixes a race where calc_showing would hide a window because, at the time of calculation whether it should be showing, the surface's buffer had been destroyed as described above. https://bugzilla.gnome.org/show_bug.cgi?id=762716