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8b0b0cf028
When committing a toplevel surface we might no longer have a MetaWindow associated with it. The reason may vary but some are: a popup was dismissed, the client attached and committed a NULL buffer to a wl_surface with the wl_shell_surface role, the client committed a buffer to a wl_surface which previously had an toplevel window role which extension object was destroyed. https://bugzilla.gnome.org/show_bug.cgi?id=755490