anchor.diff:          bottom: new TabBar(
             controller: _controller,
             isScrollable: true,
  +          indicator: getIndicator(),
             tabs: _allPages.map((_Page page) {
               switch (_demoStyle) {
                 case TabsDemoStyle.iconsAndText:
  
positive.code: class ScrollableTabsDemoState extends State<ScrollableTabsDemo> with SingleTickerProviderStateMixin {
    TabController _controller;
    TabsDemoStyle _demoStyle = TabsDemoStyle.iconsAndText;
  
    @override
    void initState() {
  
negative.code:       appBar: new AppBar(
          title: const Text('Scrollable tabs'),
          actions: <Widget>[
            new IconButton(
              icon: const Icon(Icons.sentiment_very_satisfied),
              onPressed: () {
                setState(() {
                  _customIndicator = !_customIndicator;
                });
              },
            ),
            new PopupMenuButton<TabsDemoStyle>(
              onSelected: changeDemoStyle,
              itemBuilder: (BuildContext context) => <PopupMenuItem<TabsDemoStyle>>[
  