Method expand

src/main/java/fieldbox/boxes/plugins/BoxGroup.java:212–224

()

	}

	private void expand() {
		this.properties.put(_collapsed, false);
		collapsed = false;
//		this.breadthFirst(this.downwards())
		this.children().stream()
			.filter(x -> x != this)
			.forEach(x -> {
				Boolean m = collapsedState.get(x.properties.getOrConstruct(IO.id));
				x.disconnected = m != null ? m.booleanValue() : false;
			});

		Drawing.dirty(this, 2);
	}

	boolean collapsed = false;
	Rect collapsedAt = null;