let selectedWindow: {it: Window | null} = {it: null};

let selectedTile: Tile | null = null;

	selectedWindow.it = w;

	selectedTile = t;

		selectedWindow.it = w;

		selectedTile = root;

	let t = selectedWindow.it?.tile;

	let t = selectedTile;

	t = selectedWindow.it?.tile!;
	const p = t.parent!;

	let p = t.parent;
	if (p == null) {
		// t is the root
		p = t;
		t = t.tiles[0];
	}

	selectedWindow.it = w;

	selectedTile = t;

		// the other window has just been activated but we are going to destroy its tile,
		// so we preemptively select the parent, which will soon contain the window
		selectedTile = t.parent!;