public @Nullable HighlightSeverity getSeverityByIndex(int index) {
    for (Object2IntMap.Entry<HighlightSeverity> entry : getOrderMap().object2IntEntrySet()) {
      if (entry.getIntValue() == index) {
        return entry.getKey();
      }
    }
    return null;
  }
public @Nullable HighlightSeverity getSeverityByIndex(int index)