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If the wayland surface isn't available yet when we process the WL_SURFACE_ID ClientMessage, we schedule a later function to try the association again after we get a chance to process wayland requests. This works fine except on cases where the MetaWindow already had a previous surface attached (i.e. when the xwindow is reparented) since we only break the existing association on the later function which means that when processing the old surface's destruction we destroy the MetaWindow and cancel the pending later function leaving us without a MetaWindow and an invisible surface. Fix this by detaching the old surface as soon as possible so that the MetaWindow survives. https://bugzilla.gnome.org/show_bug.cgi?id=743339