/**
  * Called when a change is made to a configuration node, such that its dependency graph
  * <em>may</em> now be larger than it previously was, and the node should be visited.
  */
 public void onMoreSelected(ConfigurationNode configuration) {
   // Add to the end of the queue, so that we traverse the graph in breadth-wise order to pick up
   // as many conflicts as
   // possible before attempting to resolve them
   if (queued.add(configuration)) {
     queue.addLast(configuration);
   }
 }