private static void addTextFragmentIfNeeded(Chunk chunk, char[] chars, int from, int to, FontInfo fontInfo, boolean isRtl) {
    if (to > from) {
      assert fontInfo != null;
      TextFragmentFactory.createTextFragments(chunk.fragments, chars, from, to, isRtl, fontInfo);
    }
  }
private static void addTextFragmentIfNeeded(Chunk chunk, char[] chars, int from, int to, FontInfo fontInfo, boolean isRtl)