anchor.diff:  ///                     },
   ///                   ),
   ///                 },
  -///                 child: TextField(
  +///                 child: const TextField(
   ///                   maxLines: 2,
   ///                   decoration: InputDecoration(
   ///                     hintText: 'Up/down increment/decrement here.',
  
positive.code: ///     child: Center(
  ///       child: Shortcuts(
  ///         shortcuts: <LogicalKeySet, Intent>{
  ///           LogicalKeySet(LogicalKeyboardKey.alt, LogicalKeyboardKey.arrowDown): NextFocusIntent(),
  ///           LogicalKeySet(LogicalKeyboardKey.alt, LogicalKeyboardKey.arrowUp): PreviousFocusIntent(),
  ///         },
  ///         child: Column(
  ///           children: <Widget>[
  ///             TextField(
  ///               decoration: InputDecoration(
  ///                 hintText: 'alt + down moves to the next field.',
  
negative.code: ///         child: Column(
  ///           mainAxisAlignment: MainAxisAlignment.center,
  ///           children: <Widget>[
  ///             const Text(
  ///               'You have pushed the button this many times:',
  ///             ),
  ///             Text(
  