let sibling_windows: Window[] = [];
	if (t.parent?.tiles?.length == 2) {
		// if this tile has only one sibling, we need to move that sibling's windows into the parent
		// when this tile gets destroyed
		// kwin kind of tries to do this but fails - it resizes the windows properly but the windows are
		// left untiled somehow
		const sibling_index = 1 - get_tile_index(t);
		const sibling_tile = t.parent!.tiles[sibling_index];
		if (sibling_tile.tiles.length == 0) {
			// it contains only windows and no tiles
			// hopefully kwin takes the wheel in the other case
			for (const w of sibling_tile.windows) {
				sibling_windows.push(w);
			}
		}
	}
	const p = t.parent;

	if (p != null) {
		for (const w of sibling_windows) {
			w.tile = p;
		}
	}