private @NotNull Object2IntMap<HighlightSeverity> getOrderMap() {
    Object2IntMap<HighlightSeverity> map = orderMap.get();
    if (map != null) return map;
    return orderMap.updateAndGet(oldMap -> oldMap == null ? fromList(getDefaultOrder()) : oldMap);
  }
private @NotNull Object2IntMap<HighlightSeverity> getOrderMap()