anchor.diff:      fontSize: fontSize,
       fontWeight: fontWeight,
       textBaseline: TextBaseline.alphabetic,
  -    height: height
  +    letterSpacing: letterSpacing,
  +    height: height,
     );
   }
   
  
positive.code: // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  import 'dart:math';
  
  import 'package:flutter/material.dart';
  
  class PestoDemo extends StatelessWidget {
    PestoDemo({ Key key }) : super(key: key);
  
negative.code:         builder: (BuildContext context, BoxConstraints constraints) {
            final Size size = constraints.biggest;
            final double appBarHeight = size.height - statusBarHeight;
            final double extraPadding = new Tween<double>(begin: 10.0, end: 24.0).lerp(
              ((appBarHeight - kToolBarHeight) / _kAppBarHeight).clamp(0.0, 1.0)
            );
            final double logoHeight = appBarHeight - 1.5 * extraPadding;
            return new Padding(
              padding: new EdgeInsets.only(
                top: statusBarHeight + 0.5 * extraPadding,
                bottom: extraPadding
              ),
              child: new Center(
                child: new PestoLogo(showText: appBarHeight >= 70.0, height: logoHeight)
              )
            );
          }
  