@Override
	public void lostOwnership(Clipboard clipboard, Transferable contents) {
    }
Notification we have lost ownership of the clipboard because 
something else was put on the clipboard.
@param clipboard the system clipboard.
@param contents the Transferable lost in the clipboard.
Ghidra/Framework/Docking/src/main/java/docking/dnd/DragDropTreeTransferable.java