@NotNull
  protected List<ArrangementSectionRule> cloneSectionRules() {
    final ArrayList<ArrangementSectionRule> rules = new ArrayList<>();
    for (ArrangementSectionRule rule : mySectionRules) {
      rules.add(rule.clone());
    }
    return rules;
  }
@NotNull
  protected List<ArrangementSectionRule> cloneSectionRules()