Method updateDepthAndHeight

src/data/Tree.ts:140–151

* Update depth and height of this subtree.

(depth: number)

     * Update depth and height of this subtree.
     */
    updateDepthAndHeight(depth: number) {
        let height = 0;
        this.depth = depth;
        for (let i = 0; i < this.children.length; i++) {
            const child = this.children[i];
            child.updateDepthAndHeight(depth + 1);
            if (child.height > height) {
                height = child.height;
            }
        }
        this.height = height + 1;
    }

    getNodeById(id: string): TreeNode {
        if (this.getId() === id) {