public List<String> getGlobalGroupRepositories(final Collection<String> all) {
    // i.e. all-[all used]
    final List<String> result = new LinkedList<>(all);

    for (int i = 0; i < myRoot.getChildCount(); i++) {
      final MyNode node = (MyNode) myRoot.getChildAt(i);
      final GroupConfigurable groupConfigurable = (GroupConfigurable) node.getConfigurable();
      if (! groupConfigurable.getEditableObject().isDefault()) {
        result.removeAll(groupConfigurable.getRepositories());
      }
    }

    return result;
  }
public List<String> getGlobalGroupRepositories(final Collection<String> all)