code: function (nodes, applyFishEyeViewToEachNode) {
      if (nodes === undefined) {
        nodes = cy.nodes();
      }
      var orphans;
      orphans = elementUtilities.getTopMostNodes(nodes);
      var expandStack = [];
      for (var i = 0; i < orphans.length; i++) {
        var root = orphans[i];
        this.expandAllTopDown(root, expandStack, applyFishEyeViewToEachNode);
      }
      return expandStack;
    }
docs: /*
  Expands all nodes by expanding all top most nodes top down with their descendants.