anchor.diff:  
   class AnsiUp {
     AnsiUp()
  -      : bold = false,
  +      : style = StyledText.NONE,
           ansiColors = [
             [
               AnsiUpColor(rgb: [0, 0, 0], className: 'ansi-black'),
  
positive.code:   }
  
    _TextWithAttr _withState(_TextPacket packet) {
      return _TextWithAttr(bold: bold, fg: fg, bg: bg, text: packet.text);
    }
  }
  
  class _TextWithAttr {
    _TextWithAttr({this.fg, this.bg, this.bold = false, this.text = ''});
  
    final AnsiUpColor? fg;
    final AnsiUpColor? bg;
    final bool bold;
    final String text;
  }
  
  
negative.code:     this.text, {
      this.fgColor,
      this.bgColor,
      this.textStyle = NONE,
      this.url = '',
    });
  
  