Method next

src/main/java/fieldbox/boxes/Box.java:213–220

(Dict.Prop<T> find, Function<Box, Collection<Box>> direction)

			.filter(x -> x != null)
			.findFirst();
	}

	@HiddenInAutocomplete
	public <T> Optional<T> next(Dict.Prop<T> find, Function<Box, Collection<Box>> direction) {
		if (properties.has(find)) return Optional.of(properties.get(find));
		return breadthFirst(direction).map(x -> x.properties.get(find))
			.filter(x -> x != null)
			.skip(1)
			.findFirst();
	}