@Nonnull
	@Override
	public Collection<Navigable> getNavigableChildren() {
		return Collections.emptyList();
	}
@param item
		Item to check against.
@param child
		Item to add.

@return {@code true} when no cycles are detected.
recaf-ui/src/main/java/software/coley/recaf/ui/pane/editing/tabs/InheritancePane.java