workspaceThumbnail: Don't keep stale clones in list
If a clone gets destroyed before the corresponding MetaWindow is removed from the workspace, we will still find it in the list of clones and try to destroy it again. Avoid the resulting warnings by updating the list of clones immediately when a clone is destroyed. https://bugzilla.gnome.org/show_bug.cgi?id=791233
parent
d0bdea31
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