anchor.diff:            break;
         }
       }
  +    if (letterSpacing != null)
  +      result.add('${prefix}letterSpacing: $letterSpacing');
       if (textAlign != null) {
         switch (textAlign) {
           case TextAlign.left:
  
positive.code:            fontSize == typedOther.fontSize &&
             fontWeight == typedOther.fontWeight &&
             fontStyle == typedOther.fontStyle &&
             textAlign == typedOther.textAlign &&
             textBaseline == typedOther.textBaseline &&
             decoration == typedOther.decoration &&
  
negative.code:       fontWeight: fontWeight,
        fontStyle: fontStyle,
        fontFamily: fontFamily,
        fontSize: fontSize,
        letterSpacing: letterSpacing
      );
    }
  
  