Method walk

packages/main/src/Tree.ts:499–501

* Perform Depth-First-Search walk on the tree and run a callback on each node * @public * @param callback function to execute on each node of the tree with 3 arguments: the node, the level and the index

(callback: WalkCallback)

	 * @param callback function to execute on each node of the tree with 3 arguments: the node, the level and the index
	 */
	walk(callback: WalkCallback): void {
		walkTree(this, 1, callback);
	}

	_getItems(): Array<HTMLElement> {
		const allLiNodesTraversed: Array<HTMLElement> = [];