Method _forEach

src/main/java/fieldbox/boxes/Box.java:252–261

(Box t, Consumer<Box> b, LinkedHashSet<Box> visited)

		LinkedHashSet<Box> visited = new LinkedHashSet<>();
		_forEach(this, b, visited);
	}

	static private void _forEach(Box t, Consumer<Box> b, LinkedHashSet<Box> visited) {
		if (visited.contains(t)) return;
		if (t.disconnected) return;
		b.accept(t);
		visited.add(t);
		for (Box c : new ArrayList<>(t.children))
			_forEach(c, b, visited);
		for (Box c : new ArrayList<>(t.parents))
			_forEach(c, b, visited);
	}