function insertMultiDragClones(elementsInserted, rootEl) {
    multiDragClones.forEach(function (clone, i) {
      var target = rootEl.children[clone.sortableIndex + (elementsInserted ? Number(i) : 0)];
      if (target) {
        rootEl.insertBefore(clone, target);
      } else {
        rootEl.appendChild(clone);
      }
    });
  }
Insert multi-drag clones
@param  {[Boolean]} elementsInserted  Whether the multi-drag elements are inserted
@param  {HTMLElement} rootEl