anchor.diff:      this.fontFamily,
       this.fontSize,
       this.fontWeight,
  +    this.fontStyle,
       this.textAlign,
       this.textBaseline,
       this.height,
  
positive.code: enum FontWeight { w100, w200, w300, w400, w500, w600, w700, w800, w900 }
  const normal = FontWeight.w400;
  const bold = FontWeight.w700;
  
  enum TextAlign { left, right, center }
  
  
negative.code:   final String fontFamily;
    final double fontSize; // in pixels
    final FontWeight fontWeight;
    final FontStyle fontStyle;
    final TextAlign textAlign;
    final TextBaseline textBaseline;
    final double height; // multiple of fontSize
  