Remove long-deprecated TwoLevelList (flutter#26238)

Author: goderbauer

examples/flutter_gallery/lib/demo/material/two_level_list_demo.dart renamed to examples/flutter_gallery/lib/demo/material/expansion_tile_list_demo.dart

@@ -6,8 +6,8 @@ import 'package:flutter/material.dart';
 
 import '../../gallery/demo.dart';
 
-class TwoLevelListDemo extends StatelessWidget {
-  static const String routeName = '/material/two-level-list';
+class ExpansionTileListDemo extends StatelessWidget {
+  static const String routeName = '/material/expansion-tile-list';
 
   @override
   Widget build(BuildContext context) {

examples/flutter_gallery/lib/demo/material/material.dart

@@ -14,6 +14,7 @@ export 'dialog_demo.dart';
 export 'drawer_demo.dart';
 export 'elevation_demo.dart';
 export 'expansion_panels_demo.dart';
+export 'expansion_tile_list_demo.dart';
 export 'grid_list_demo.dart';
 export 'icons_demo.dart';
 export 'leave_behind_demo.dart';
@@ -34,4 +35,3 @@ export 'tabs_demo.dart';
 export 'tabs_fab_demo.dart';
 export 'text_form_field_demo.dart';
 export 'tooltip_demo.dart';
-export 'two_level_list_demo.dart';

examples/flutter_gallery/lib/gallery/demos.dart

@@ -243,9 +243,9 @@ List<GalleryDemo> _buildGalleryDemos() {
       subtitle: 'A list with one sub-list level',
       icon: GalleryIcons.expand_all,
       category: _kMaterialComponents,
-      routeName: TwoLevelListDemo.routeName,
+      routeName: ExpansionTileListDemo.routeName,
       documentationUrl: 'https://docs.flutter.io/flutter/material/ExpansionTile-class.html',
-      buildRoute: (BuildContext context) => TwoLevelListDemo(),
+      buildRoute: (BuildContext context) => ExpansionTileListDemo(),
     ),
     GalleryDemo(
       title: 'Expansion panels',

examples/flutter_gallery/test/accessibility_test.dart

@@ -229,9 +229,9 @@ void main() {
       handle.dispose();
     });
 
-    testWidgets('two_level_list_demo', (WidgetTester tester) async {
+    testWidgets('expansion_tile_list_demo', (WidgetTester tester) async {
       final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: TwoLevelListDemo()));
+      await tester.pumpWidget(MaterialApp(home: ExpansionTileListDemo()));
       await expectLater(tester, meetsGuideline(androidTapTargetGuideline));
       handle.dispose();
     });
@@ -462,9 +462,9 @@ void main() {
       handle.dispose();
     });
 
-    testWidgets('two_level_list_demo', (WidgetTester tester) async {
+    testWidgets('expansion_tile_list_demo', (WidgetTester tester) async {
       final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: TwoLevelListDemo()));
+      await tester.pumpWidget(MaterialApp(home: ExpansionTileListDemo()));
       await expectLater(tester, meetsGuideline(labeledTapTargetGuideline));
       handle.dispose();
     });
@@ -775,11 +775,11 @@ void main() {
         handle.dispose();
       });
 
-      testWidgets('two_level_list_demo $themeName', (WidgetTester tester) async {
+      testWidgets('expansion_tile_list_demo $themeName', (WidgetTester tester) async {
         final AutomatedTestWidgetsFlutterBinding binding = tester.binding;
         binding.addTime(const Duration(seconds: 3));
         final SemanticsHandle handle = tester.ensureSemantics();
-        await tester.pumpWidget(MaterialApp(theme: theme, home: TwoLevelListDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: ExpansionTileListDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });

packages/flutter/lib/material.dart

@@ -105,7 +105,6 @@ export 'src/material/time.dart';
 export 'src/material/time_picker.dart';
 export 'src/material/toggleable.dart';
 export 'src/material/tooltip.dart';
-export 'src/material/two_level_list.dart';
 export 'src/material/typography.dart';
 export 'src/material/user_accounts_drawer_header.dart';
 export 'widgets.dart';