getSetElements method
Gets all elements in the same set as the given element
Implementation
Set<T> getSetElements(T element) {
final root = find(element);
if (root == null) return <T>{};
final elements = <T>{};
for (final node in _nodes.values) {
if (find(node.value) == root) {
elements.add(node.value);
}
}
return elements;
}