anchor.diff:                        padding: new EdgeInsets.only(top: fabHalfSize),
                         child: new SizedBox(
                           width: fullWidth ? null : _kRecipePageMaxWidth,
  -                        child: new _RecipeSheet(recipe: config.recipe)
  +                        child: new RecipeSheet(recipe: config.recipe)
                         )
                       ),
                       new Positioned(
  
positive.code:           icon: new Icon(Icons.search),
            tooltip: 'Search',
            onPressed: () {
              _scaffoldKey.currentState.showSnackBar(new SnackBar(
                content: new Text('Not supported.')
              ));
            }
  
negative.code:   }
  }
  
  // Displays one recipe. Includes the recipe sheet with a background image.
  class RecipePage extends StatefulWidget {
    RecipePage({ Key key, this.recipe }) : super(key: key);
  
    final Recipe recipe;
  
  