@Override
      public @Nullable @Nls String getTitle(int pattern) {
        if (getFileCount(pattern) == 1) {
          if (myPattern2Description.containsKey(pattern)) {
            return myPattern2Description.get(pattern).getTitle();
          }
          return cacheGroupNodeDescription(pattern).getTitle();
        }
        return null;
      }
@Override
      public @Nullable @Nls String getTitle(int pattern)