anchor.diff:              ]
             ),
             new Container(
  -            margin: const EdgeInsets.only(
  -              left: 12.0
  -            ),
  +            margin: const EdgeInsetsDirectional.only(start: 12.0),
               child: _buildHeaderText(index)
             )
           ]
  
positive.code:   Widget _buildVerticalBody(int index) {
      return new Stack(
        children: <Widget>[
          new Positioned(
            left: 24.0,
            top: 0.0,
            bottom: 0.0,
            child: new SizedBox(
  
negative.code:                 ),
                ),
                new Container(
                  margin: const EdgeInsetsDirectional.only(start: 12.0),
                  child: _buildHeaderText(i),
                ),
              ],
  