Method update

src/main/java/fieldbox/boxes/Watches.java:64–82

()

	SetMultimap<Dict.Prop, String> allWatches = MultimapBuilder.linkedHashKeys().linkedHashSetValues().build();

	protected boolean update() {

		breadthFirst(both()).forEach((x) -> {
			LinkedHashMap<Dict.Prop, Object> previous = x.properties.computeIfAbsent(watchedPrevious, (k) -> new LinkedHashMap<>());
			for (Dict.Prop p : allWatches .keySet()) {
				Object was = previous.get(p);
				Object now = x.properties.get(p);

				if (!Util.safeEq(was, now))
				{
					fire(p, x, was, now, allWatches .get(p));
					// fetch it again, fire can change the value of the property
					now = x.properties.get(p);
					previous.put(p, now instanceof Mutable ? ((Mutable)now).duplicate() : now);
				}
			}
		});
		return true;
	}

	public String addWatch(Dict.Prop property, String address)
	{