anchor.diff:      String fontFamily,
       double fontSize,
       FontWeight fontWeight,
  +    FontStyle fontStyle,
       TextAlign textAlign,
       TextBaseline textBaseline,
       double height,
  
positive.code:       fontFamily: other.fontFamily,
        fontSize: other.fontSize,
        fontWeight: other.fontWeight,
        textAlign: other.textAlign,
        textBaseline: other.textBaseline,
        height: other.height,
  
negative.code:     value = 37 * value + fontFamily.hashCode;
      value = 37 * value + fontSize.hashCode;
      value = 37 * value + fontWeight.hashCode;
      value = 37 * value + fontStyle.hashCode;
      value = 37 * value + textAlign.hashCode;
      value = 37 * value + textBaseline.hashCode;
      value = 37 * value + decoration.hashCode;
  