anchor.diff:    final int posX;
     final int posY;
   
  -  Widget build() {
  +  Widget build(BuildContext context) {
       Widget text;
       if (flagged)
         text = buildInnerCell(new StyledText(elements : [textStyles[5], '\u2691']));
  
positive.code:   // |uiState| keeps track of the visible player progess.
    List<List<CellState>> uiState;
  
    void initState() {
      resetGame();
    }
  
  
negative.code:       // FIXME: Strange to have the toolbar be tapable.
        center: new Listener(
          onPointerDown: handleToolbarPointerDown,
          child: new Text(toolbarCaption, style: Theme.of(context).text.title)
        )
      );
    }
  
    Widget build(BuildContext context) {
      // We build the board before we build the toolbar because we compute the win state during build step.
      Widget board = buildBoard();
      return new Title(
        title: 'Mine Digger',
        child: new Scaffold(
          toolbar: buildToolBar(context),
          body: new Container(
            child: new Center(child: board),
            decoration: new BoxDecoration(backgroundColor: Colors.grey[50])
  