anchor.diff:                bottom: extraPadding
               ),
               child: new Center(
  -              child: new PestoLogo(showText: appBarHeight >= 70.0, height: logoHeight)
  +              child: new PestoLogo(height: logoHeight, t: t)
               )
             );
           }
  
positive.code: }
  
  class PestoLogo extends StatefulWidget {
    PestoLogo({this.showText, this.height});
  
    final bool showText;
    final double height;
  
    @override
    _PestoLogoState createState() => new _PestoLogoState();
  
negative.code:         builder: (BuildContext context, BoxConstraints constraints) {
            final Size size = constraints.biggest;
            final double appBarHeight = size.height - statusBarHeight;
            final double t = (appBarHeight - kToolbarHeight) / (_kAppBarHeight - kToolbarHeight);
            final double extraPadding = new Tween<double>(begin: 10.0, end: 24.0).lerp(t);
            final double logoHeight = appBarHeight - 1.5 * extraPadding;
            return new Padding(
              padding: new EdgeInsets.only(
  