anchor.diff:    static const String _sunshineURL = "http://www.walltor.com/images/wallpaper/good-morning-sunshine-58540.jpg";
   
     static const double kCardMargins = 8.0;
  +  static const double kFixedCardHeight = 100.0;
   
     final TextStyle backgroundTextStyle =
       Typography.white.title.copyWith(textAlign: TextAlign.center);
  
positive.code:             )
            : new DefaultTextStyle(
                style: DefaultTextStyle.of(context).merge(cardLabelStyle).merge(_textStyle).copyWith(
                  fontSize: _varyFontSizes ? _cardModels.length.toDouble() : null
                ),
                child: new Column(
                  children: <Widget>[
  
negative.code:   Widget build(BuildContext context) {
      Widget cardCollection;
      if (_fixedSizeCards) {
        _invalidator = null;
        cardCollection = new ScrollableList(
          snapOffsetCallback: _snapToCenter ? _toSnapOffset : null,
          itemExtent: kFixedCardHeight,
          children: _cardIndices.map/*<Widget>*/((int index) => _buildCard(context, index))
        );
      } else {
        cardCollection = new ScrollableMixedWidgetList(
  