Method has

packages/shell/src/model/selection.ts:68–70

* 判断是否选中了指定节点 * @param id * @returns

(id: string)

   * @returns
   */
  has(id: string): boolean {
    return this[selectionSymbol].has(id);
  }

  /**
   * 选中指定节点（增量方式）