
Currently, the drag and drop code assumes that on a successful drop the target will either consume the drag actor or that it is otherwise OK to destroy the actor. As the drag behavior for window preview was changed, dropping a preview on the dash now results in the preview being swallowed - to fix, add an option to restore the actor in case of a successful drop as well. https://bugzilla.gnome.org/show_bug.cgi?id=619203