code: private void updateSingle(
              ReadOnlyStyledDocument<PS, SEG, S> newValue,
              RichTextChange<PS, SEG, S> change,
              MaterializedListModification<Paragraph<PS, SEG, S>> parChange) {
          updateMulti(newValue, Collections.singletonList(change), Collections.singletonList(parChange));
      }
docs: /* ********************************************************************** *
  *
  Private and package private methods                                    *
  *
  **********************************************************************