docs: public static void iterateTreeNonBreakable (@Nonnull final IHCNode aNode,
                                                @Nonnull final IHCIteratorNonBreakableCallback aCallback)
    {
      ValueEnforcer.notNull (aNode, "node");
      ValueEnforcer.notNull (aCallback, "callback");
  
      // call callback on start node
      final ICommonsList <IHCNode> aParentNodes = new CommonsArrayList <> ();
      final ICommonsList <IHCNode> aNodes = new CommonsArrayList <> ();
      aParentNodes.add (null);
      aNodes.add (aNode);
      _iterateTreeNonBreakable (aParentNodes, aNodes, aCallback);
    }