Method insertBefore

src/tree/model/tree-store.js:76–79

(data, refData)

  }

  insertBefore(data, refData) {
    const refNode = this.getNode(refData);
    refNode.parent.insertBefore({ data }, refNode);
  }

  insertAfter(data, refData) {
    const refNode = this.getNode(refData);