@Nullable
      @Override
      protected FoldedRangeDescription getDescription(@NotNull Project project, int lineNumber, int index) {
        int masterLine = myLineConvertor.convert(lineNumber);
        if (masterLine == -1) return null;
        return getLineSeparatorDescription(project, myDocument, masterLine);
      }
@Nullable
      @Override
      protected FoldedRangeDescription getDescription(@NotNull Project project, int lineNumber, int index)