code: function _initLayoutNode(node, spec) {
          if (!spec && this.options.flowOptions.insertSpec) {
              node.setSpec(this.options.flowOptions.insertSpec);
          }
      }
docs: Called whenever a layout-node is created/re-used. Initializes
  the node with the `insertSpec` if it has been defined and enabled
  locking of the x/y translation so that the x/y position of the renderable
  is immediately updated when the user scrolls the view.