anchor.diff:    });
   
     @override
  -  Widget build(BuildContext context, WidgetRef ref) => LayoutBuilder(
  +  Widget build(BuildContext context) => LayoutBuilder(
           builder: (context, constraints) {
             if (constraints.maxWidth < 540) {
               // Single column layout
  -            return _buildScaffold(context, ref, true);
  +            return _buildScaffold(context, true);
             } else {
               // Two-column layout
               return Scaffold(
  
positive.code:     );
    }
  
    Scaffold _buildScaffold(BuildContext context, WidgetRef ref, bool hasDrawer) {
      return Scaffold(
        key: scaffoldGlobalKey,
        appBar: AppBar(
  
negative.code:  */
  
  import 'package:flutter/material.dart';
  
  import 'device_button.dart';
  import 'keys.dart';
  import 'main_drawer.dart';
  
  class AppPage extends StatelessWidget {
    final Widget? title;
    final Widget child;
    final List<Widget> actions;
  