[Re-Land] Implement focus traversal for desktop platforms. (#31614)

This re-lands the Focus changes in #30040. Correctness changes in routes.dart, and removes the automatic requesting of focus on reparent when there is no current focus, which caused undesirable selections.

Addresses #11344, #1608, #13264, and #1678
Fixes #30084
Fixes #26704

dev/manual_tests/lib/raw_keyboard.dart

@@ -62,7 +62,7 @@ class _HardwareKeyDemoState extends State<RawKeyboardDemo> {
           if (!_focusNode.hasFocus) {
             return GestureDetector(
               onTap: () {
-                FocusScope.of(context).requestFocus(_focusNode);
+                _focusNode.requestFocus();
               },
               child: Text('Tap to focus', style: textTheme.display1),
             );

dev/snippets/config/templates/stateful_widget_scaffold.tmpl

@@ -17,7 +17,7 @@ class MyApp extends StatelessWidget {
     return MaterialApp(
       title: _title,
       home: Scaffold(
-        appBar: AppBar(title: Text(_title)),
+        appBar: AppBar(title: const Text(_title)),
         body: MyStatefulWidget(),
       ),
     );

dev/snippets/config/templates/stateless_widget_scaffold.tmpl

@@ -17,7 +17,7 @@ class MyApp extends StatelessWidget {
     return MaterialApp(
       title: _title,
       home: Scaffold(
-        appBar: AppBar(title: Text(_title)),
+        appBar: AppBar(title: const Text(_title)),
         body: MyStatelessWidget(),
       ),
     );

dev/tools/gen_keycodes/data/keyboard_key.tmpl

@@ -90,7 +90,7 @@ import 'package:flutter/foundation.dart';
 ///                 onTap: () {
 ///                   FocusScope.of(context).requestFocus(_focusNode);
 ///                 },
-///                 child: Text('Tap to focus'),
+///                 child: const Text('Tap to focus'),
 ///               );
 ///             }
 ///             return Text(_message ?? 'Press a key');

packages/flutter/lib/src/cupertino/tab_scaffold.dart

@@ -304,7 +304,7 @@ class _TabSwitchingViewState extends State<_TabSwitchingView> {
     tabs = List<Widget>(widget.tabNumber);
     tabFocusNodes = List<FocusScopeNode>.generate(
       widget.tabNumber,
-      (int index) => FocusScopeNode(),
+      (int index) => FocusScopeNode(debugLabel: 'Tab Focus Scope $index'),
     );
   }
 
@@ -327,7 +327,7 @@ class _TabSwitchingViewState extends State<_TabSwitchingView> {
   @override
   void dispose() {
     for (FocusScopeNode focusScopeNode in tabFocusNodes) {
-      focusScopeNode.detach();
+      focusScopeNode.dispose();
     }
     super.dispose();
   }

packages/flutter/lib/src/material/search.dart

@@ -191,7 +191,7 @@ abstract class SearchDelegate<T> {
   ///
   ///  * [showSuggestions] to show the search suggestions again.
   void showResults(BuildContext context) {
-    _focusNode.unfocus();
+    _focusNode?.unfocus();
     _currentBody = _SearchBody.results;
   }
 
@@ -208,7 +208,8 @@ abstract class SearchDelegate<T> {
   ///
   ///  * [showResults] to show the search results.
   void showSuggestions(BuildContext context) {
-    FocusScope.of(context).requestFocus(_focusNode);
+    assert(_focusNode != null, '_focusNode must be set by route before showSuggestions is called.');
+    _focusNode.requestFocus();
     _currentBody = _SearchBody.suggestions;
   }
 
@@ -218,7 +219,7 @@ abstract class SearchDelegate<T> {
   /// to [showSearch] that launched the search initially.
   void close(BuildContext context, T result) {
     _currentBody = null;
-    _focusNode.unfocus();
+    _focusNode?.unfocus();
     Navigator.of(context)
       ..popUntil((Route<dynamic> route) => route == _route)
       ..pop(result);
@@ -232,7 +233,9 @@ abstract class SearchDelegate<T> {
   /// page.
   Animation<double> get transitionAnimation => _proxyAnimation;
 
-  final FocusNode _focusNode = FocusNode();
+  // The focus node to use for manipulating focus on the search page. This is
+  // managed, owned, and set by the _SearchPageRoute using this delegate.
+  FocusNode _focusNode;
 
   final TextEditingController _queryTextController = TextEditingController();
 
@@ -246,7 +249,6 @@ abstract class SearchDelegate<T> {
   }
 
   _SearchPageRoute<T> _route;
-
 }
 
 /// Describes the body that is currently shown under the [AppBar] in the
@@ -346,13 +348,18 @@ class _SearchPage<T> extends StatefulWidget {
 }
 
 class _SearchPageState<T> extends State<_SearchPage<T>> {
+  // This node is owned, but not hosted by, the search page. Hosting is done by
+  // the text field.
+  FocusNode focusNode = FocusNode();
+
   @override
   void initState() {
     super.initState();
     queryTextController.addListener(_onQueryChanged);
     widget.animation.addStatusListener(_onAnimationStatusChanged);
     widget.delegate._currentBodyNotifier.addListener(_onSearchBodyChanged);
-    widget.delegate._focusNode.addListener(_onFocusChanged);
+    focusNode.addListener(_onFocusChanged);
+    widget.delegate._focusNode = focusNode;
   }
 
   @override
@@ -361,7 +368,8 @@ class _SearchPageState<T> extends State<_SearchPage<T>> {
     queryTextController.removeListener(_onQueryChanged);
     widget.animation.removeStatusListener(_onAnimationStatusChanged);
     widget.delegate._currentBodyNotifier.removeListener(_onSearchBodyChanged);
-    widget.delegate._focusNode.removeListener(_onFocusChanged);
+    widget.delegate._focusNode = null;
+    focusNode.dispose();
   }
 
   void _onAnimationStatusChanged(AnimationStatus status) {
@@ -370,12 +378,12 @@ class _SearchPageState<T> extends State<_SearchPage<T>> {
     }
     widget.animation.removeStatusListener(_onAnimationStatusChanged);
     if (widget.delegate._currentBody == _SearchBody.suggestions) {
-      FocusScope.of(context).requestFocus(widget.delegate._focusNode);
+      focusNode.requestFocus();
     }
   }
 
   void _onFocusChanged() {
-    if (widget.delegate._focusNode.hasFocus && widget.delegate._currentBody != _SearchBody.suggestions) {
+    if (focusNode.hasFocus && widget.delegate._currentBody != _SearchBody.suggestions) {
       widget.delegate.showSuggestions(context);
     }
   }
@@ -436,7 +444,7 @@ class _SearchPageState<T> extends State<_SearchPage<T>> {
           leading: widget.delegate.buildLeading(context),
           title: TextField(
             controller: queryTextController,
-            focusNode: widget.delegate._focusNode,
+            focusNode: focusNode,
             style: theme.textTheme.title,
             textInputAction: TextInputAction.search,
             onSubmitted: (String _) {

packages/flutter/lib/src/rendering/editable.dart

@@ -1465,7 +1465,8 @@ class RenderEditable extends RenderBox {
   }
 
   TextSelection _selectWordAtOffset(TextPosition position) {
-    assert(_textLayoutLastWidth == constraints.maxWidth);
+    assert(_textLayoutLastWidth == constraints.maxWidth,
+      'Last width ($_textLayoutLastWidth) not the same as max width constraint (${constraints.maxWidth}).');
     final TextRange word = _textPainter.getWordBoundary(position);
     // When long-pressing past the end of the text, we want a collapsed cursor.
     if (position.offset >= word.end)
@@ -1537,7 +1538,8 @@ class RenderEditable extends RenderBox {
   }
 
   void _paintCaret(Canvas canvas, Offset effectiveOffset, TextPosition textPosition) {
-    assert(_textLayoutLastWidth == constraints.maxWidth);
+    assert(_textLayoutLastWidth == constraints.maxWidth,
+      'Last width ($_textLayoutLastWidth) not the same as max width constraint (${constraints.maxWidth}).');
 
     // If the floating cursor is enabled, the text cursor's color is [backgroundCursorColor] while
     // the floating cursor's color is _cursorColor;
@@ -1603,7 +1605,8 @@ class RenderEditable extends RenderBox {
   }
 
   void _paintFloatingCaret(Canvas canvas, Offset effectiveOffset) {
-    assert(_textLayoutLastWidth == constraints.maxWidth);
+    assert(_textLayoutLastWidth == constraints.maxWidth,
+      'Last width ($_textLayoutLastWidth) not the same as max width constraint (${constraints.maxWidth}).');
     assert(_floatingCursorOn);
 
     // We always want the floating cursor to render at full opacity.
@@ -1690,7 +1693,8 @@ class RenderEditable extends RenderBox {
   }
 
   void _paintSelection(Canvas canvas, Offset effectiveOffset) {
-    assert(_textLayoutLastWidth == constraints.maxWidth);
+    assert(_textLayoutLastWidth == constraints.maxWidth,
+      'Last width ($_textLayoutLastWidth) not the same as max width constraint (${constraints.maxWidth}).');
     assert(_selectionRects != null);
     final Paint paint = Paint()..color = _selectionColor;
     for (ui.TextBox box in _selectionRects)
@@ -1698,7 +1702,8 @@ class RenderEditable extends RenderBox {
   }
 
   void _paintContents(PaintingContext context, Offset offset) {
-    assert(_textLayoutLastWidth == constraints.maxWidth);
+    assert(_textLayoutLastWidth == constraints.maxWidth,
+      'Last width ($_textLayoutLastWidth) not the same as max width constraint (${constraints.maxWidth}).');
     final Offset effectiveOffset = offset + _paintOffset;
 
     bool showSelection = false;

packages/flutter/lib/src/services/keyboard_key.dart

@@ -90,7 +90,7 @@ import 'package:flutter/foundation.dart';
 ///                 onTap: () {
 ///                   FocusScope.of(context).requestFocus(_focusNode);
 ///                 },
-///                 child: Text('Tap to focus'),
+///                 child: const Text('Tap to focus'),
 ///               );
 ///             }
 ///             return Text(_message ?? 'Press a key');

packages/flutter/lib/src/widgets/editable_text.dart

@@ -787,6 +787,7 @@ class EditableTextState extends State<EditableText> with AutomaticKeepAliveClien
 
   final LayerLink _layerLink = LayerLink();
   bool _didAutoFocus = false;
+  FocusAttachment _focusAttachment;
 
   // This value is an eyeball estimation of the time it takes for the iOS cursor
   // to ease in and out.
@@ -809,6 +810,7 @@ class EditableTextState extends State<EditableText> with AutomaticKeepAliveClien
   void initState() {
     super.initState();
     widget.controller.addListener(_didChangeTextEditingValue);
+    _focusAttachment = widget.focusNode.attach(context);
     widget.focusNode.addListener(_handleFocusChanged);
     _scrollController.addListener(() { _selectionOverlay?.updateForScroll(); });
     _cursorBlinkOpacityController = AnimationController(vsync: this, duration: _fadeDuration);
@@ -836,6 +838,8 @@ class EditableTextState extends State<EditableText> with AutomaticKeepAliveClien
     }
     if (widget.focusNode != oldWidget.focusNode) {
       oldWidget.focusNode.removeListener(_handleFocusChanged);
+      _focusAttachment?.detach();
+      _focusAttachment = widget.focusNode.attach(context);
       widget.focusNode.addListener(_handleFocusChanged);
       updateKeepAlive();
     }
@@ -852,6 +856,7 @@ class EditableTextState extends State<EditableText> with AutomaticKeepAliveClien
     assert(_cursorTimer == null);
     _selectionOverlay?.dispose();
     _selectionOverlay = null;
+    _focusAttachment.detach();
     widget.focusNode.removeListener(_handleFocusChanged);
     super.dispose();
   }
@@ -1091,10 +1096,7 @@ class EditableTextState extends State<EditableText> with AutomaticKeepAliveClien
     if (_hasFocus) {
       _openInputConnection();
     } else {
-      final List<FocusScopeNode> ancestorScopes = FocusScope.ancestorsOf(context);
-      for (int i = ancestorScopes.length - 1; i >= 1; i -= 1)
-        ancestorScopes[i].setFirstFocus(ancestorScopes[i - 1]);
-      FocusScope.of(context).requestFocus(widget.focusNode);
+      widget.focusNode.requestFocus();
     }
   }
 
@@ -1400,7 +1402,7 @@ class EditableTextState extends State<EditableText> with AutomaticKeepAliveClien
   @override
   Widget build(BuildContext context) {
     assert(debugCheckHasMediaQuery(context));
-    FocusScope.of(context).reparentIfNeeded(widget.focusNode);
+    _focusAttachment.reparent();
     super.build(context); // See AutomaticKeepAliveClientMixin.
 
     final TextSelectionControls controls = widget.selectionControls;

packages/flutter/lib/src/widgets/framework.dart

@@ -2117,7 +2117,7 @@ class BuildOwner {
   /// the [FocusScopeNode] for a given [BuildContext].
   ///
   /// See [FocusManager] for more details.
-  final FocusManager focusManager = FocusManager();
+  FocusManager focusManager = FocusManager();
 
   /// Adds an element to the dirty elements list so that it will be rebuilt
   /// when [WidgetsBinding.drawFrame] calls [buildScope].

packages/flutter/lib/src/widgets/navigator.dart

@@ -1468,7 +1468,7 @@ class NavigatorState extends State<Navigator> with TickerProviderStateMixin {
   final Set<Route<dynamic>> _poppedRoutes = <Route<dynamic>>{};
 
   /// The [FocusScopeNode] for the [FocusScope] that encloses the routes.
-  final FocusScopeNode focusScopeNode = FocusScopeNode();
+  final FocusScopeNode focusScopeNode = FocusScopeNode(debugLabel: 'Navigator Scope');
 
   final List<OverlayEntry> _initialOverlayEntries = <OverlayEntry>[];
 
@@ -1556,7 +1556,7 @@ class NavigatorState extends State<Navigator> with TickerProviderStateMixin {
       route.dispose();
     _poppedRoutes.clear();
     _history.clear();
-    focusScopeNode.detach();
+    focusScopeNode.dispose();
     super.dispose();
     assert(() { _debugLocked = false; return true; }());
   }

packages/flutter/lib/src/widgets/raw_keyboard_listener.dart

@@ -7,6 +7,7 @@ import 'package:flutter/services.dart';
 
 import 'basic.dart';
 import 'focus_manager.dart';
+import 'focus_scope.dart';
 import 'framework.dart';
 
 export 'package:flutter/services.dart' show RawKeyEvent;
@@ -112,5 +113,5 @@ class _RawKeyboardListenerState extends State<RawKeyboardListener> {
   }
 
   @override
-  Widget build(BuildContext context) => widget.child;
+  Widget build(BuildContext context) => Focus(focusNode: widget.focusNode, child: widget.child);
 }

packages/flutter/lib/src/widgets/routes.dart

@@ -583,6 +583,9 @@ class _ModalScopeState<T> extends State<_ModalScope<T>> {
   // This is the combination of the two animations for the route.
   Listenable _listenable;
 
+  /// The node this scope will use for its root [FocusScope] widget.
+  final FocusScopeNode focusScopeNode = FocusScopeNode(debugLabel: '$_ModalScopeState Focus Scope');
+
   @override
   void initState() {
     super.initState();
@@ -592,12 +595,18 @@ class _ModalScopeState<T> extends State<_ModalScope<T>> {
     if (widget.route.secondaryAnimation != null)
       animations.add(widget.route.secondaryAnimation);
     _listenable = Listenable.merge(animations);
+    if (widget.route.isCurrent) {
+      widget.route.navigator.focusScopeNode.setFirstFocus(focusScopeNode);
+    }
   }
 
   @override
   void didUpdateWidget(_ModalScope<T> oldWidget) {
     super.didUpdateWidget(oldWidget);
     assert(widget.route == oldWidget.route);
+    if (widget.route.isCurrent) {
+      widget.route.navigator.focusScopeNode.setFirstFocus(focusScopeNode);
+    }
   }
 
   @override
@@ -612,6 +621,12 @@ class _ModalScopeState<T> extends State<_ModalScope<T>> {
     });
   }
 
+  @override
+  void dispose() {
+    focusScopeNode.dispose();
+    super.dispose();
+  }
+
   // This should be called to wrap any changes to route.isCurrent, route.canPop,
   // and route.offstage.
   void _routeSetState(VoidCallback fn) {
@@ -629,7 +644,7 @@ class _ModalScopeState<T> extends State<_ModalScope<T>> {
         child: PageStorage(
           bucket: widget.route._storageBucket, // immutable
           child: FocusScope(
-            node: widget.route.focusScopeNode, // immutable
+            node: focusScopeNode, // immutable
             child: RepaintBoundary(
               child: AnimatedBuilder(
                 animation: _listenable, // immutable
@@ -887,9 +902,6 @@ abstract class ModalRoute<T> extends TransitionRoute<T> with LocalHistoryRoute<T
     return child;
   }
 
-  /// The node this route will use for its root [FocusScope] widget.
-  final FocusScopeNode focusScopeNode = FocusScopeNode();
-
   @override
   void install(OverlayEntry insertionPoint) {
     super.install(insertionPoint);
@@ -899,14 +911,10 @@ abstract class ModalRoute<T> extends TransitionRoute<T> with LocalHistoryRoute<T
 
   @override
   TickerFuture didPush() {
-    navigator.focusScopeNode.setFirstFocus(focusScopeNode);
-    return super.didPush();
+    if (_scopeKey.currentState != null) {
+      navigator.focusScopeNode.setFirstFocus(_scopeKey.currentState.focusScopeNode);
     }
-
-  @override
-  void dispose() {
-    focusScopeNode.detach();
-    super.dispose();
+    return super.didPush();
   }
 
   // The API for subclasses to override - used by this class

packages/flutter/test/cupertino/tab_scaffold_test.dart

@@ -106,7 +106,10 @@ void main() {
 
   testWidgets('Last tab gets focus', (WidgetTester tester) async {
     // 2 nodes for 2 tabs
-    final List<FocusNode> focusNodes = <FocusNode>[FocusNode(), FocusNode()];
+    final List<FocusNode> focusNodes = <FocusNode>[
+      FocusNode(debugLabel: 'Node 1'),
+      FocusNode(debugLabel: 'Node 2'),
+    ];
 
     await tester.pumpWidget(
       CupertinoApp(
@@ -139,7 +142,10 @@ void main() {
 
   testWidgets('Do not affect focus order in the route', (WidgetTester tester) async {
     final List<FocusNode> focusNodes = <FocusNode>[
-      FocusNode(), FocusNode(), FocusNode(), FocusNode(),
+      FocusNode(debugLabel: 'Node 1'),
+      FocusNode(debugLabel: 'Node 2'),
+      FocusNode(debugLabel: 'Node 3'),
+      FocusNode(debugLabel: 'Node 4'),
     ];
 
     await tester.pumpWidget(

packages/flutter/test/material/text_field_focus_test.dart

@@ -9,11 +9,14 @@ void main() {
   testWidgets('Dialog interaction', (WidgetTester tester) async {
     expect(tester.testTextInput.isVisible, isFalse);
 
+    final FocusNode focusNode = FocusNode(debugLabel: 'Editable Text Node');
+
     await tester.pumpWidget(
-      const MaterialApp(
+      MaterialApp(
         home: Material(
           child: Center(
             child: TextField(
+              focusNode: focusNode,
               autofocus: true,
             ),
           ),
@@ -130,7 +133,7 @@ void main() {
     await tester.pumpWidget(Container());
 
     expect(tester.testTextInput.isVisible, isFalse);
-  }, skip: true); // https://github.com/flutter/flutter/issues/29384.
+  });
 
   testWidgets('Focus triggers keep-alive', (WidgetTester tester) async {
     final FocusNode focusNode = FocusNode();

packages/flutter/test/material/text_field_test.dart

@@ -2754,12 +2754,12 @@ void main() {
       controller = TextEditingController();
     });
 
-    MaterialApp setupWidget() {
-
+    Future<void> setupWidget(WidgetTester tester) async {
       final FocusNode focusNode = FocusNode();
       controller = TextEditingController();
 
-      return MaterialApp(
+      await tester.pumpWidget(
+        MaterialApp(
           home: Material(
             child: RawKeyboardListener(
               focusNode: focusNode,
@@ -2769,14 +2769,15 @@ void main() {
                 maxLines: 3,
                 strutStyle: StrutStyle.disabled,
               ),
-          ) ,
+            ),
+          ),
         ),
       );
+      await tester.pump();
     }
 
     testWidgets('Shift test 1', (WidgetTester tester) async {
-
-      await tester.pumpWidget(setupWidget());
+      await setupWidget(tester);
       const String testValue = 'a big house';
       await tester.enterText(find.byType(TextField), testValue);
 
@@ -2789,7 +2790,7 @@ void main() {
     });
 
     testWidgets('Control Shift test', (WidgetTester tester) async {
-      await tester.pumpWidget(setupWidget());
+      await setupWidget(tester);
       const String testValue = 'their big house';
       await tester.enterText(find.byType(TextField), testValue);
 
@@ -2805,7 +2806,7 @@ void main() {
     });
 
     testWidgets('Down and up test', (WidgetTester tester) async {
-      await tester.pumpWidget(setupWidget());
+      await setupWidget(tester);
       const String testValue = 'a big house';
       await tester.enterText(find.byType(TextField), testValue);
 
@@ -2827,7 +2828,7 @@ void main() {
     });
 
     testWidgets('Down and up test 2', (WidgetTester tester) async {
-      await tester.pumpWidget(setupWidget());
+      await setupWidget(tester);
       const String testValue = 'a big house\njumped over a mouse\nOne more line yay'; // 11 \n 19
       await tester.enterText(find.byType(TextField), testValue);
 
@@ -2914,6 +2915,8 @@ void main() {
         ),
       ),
     );
+    focusNode.requestFocus();
+    await tester.pump();
 
     const String testValue = 'a big house\njumped over a mouse'; // 11 \n 19
     await tester.enterText(find.byType(TextField), testValue);
@@ -2984,6 +2987,8 @@ void main() {
         ),
       ),
     );
+    focusNode.requestFocus();
+    await tester.pump();
 
     const String testValue = 'a big house\njumped over a mouse'; // 11 \n 19
     await tester.enterText(find.byType(TextField), testValue);
@@ -3093,6 +3098,8 @@ void main() {
         ),
       ),
     );
+    focusNode.requestFocus();
+    await tester.pump();
 
     const String testValue = 'a big house\njumped over a mouse'; // 11 \n 19
     await tester.enterText(find.byType(TextField), testValue);

packages/flutter/test/widgets/editable_text_test.dart

@@ -17,8 +17,8 @@ import 'editable_text_utils.dart';
 import 'semantics_tester.dart';
 
 final TextEditingController controller = TextEditingController();
-final FocusNode focusNode = FocusNode();
-final FocusScopeNode focusScopeNode = FocusScopeNode();
+final FocusNode focusNode = FocusNode(debugLabel: 'EditableText Node');
+final FocusScopeNode focusScopeNode = FocusScopeNode(debugLabel: 'EditableText Scope Node');
 const TextStyle textStyle = TextStyle();
 const Color cursorColor = Color.fromARGB(0xFF, 0xFF, 0x00, 0x00);
 
@@ -955,6 +955,9 @@ void main() {
       ),
     ));
 
+    focusNode.requestFocus();
+    await tester.pump();
+
     expect(
       semantics,
       includesNodeWith(
@@ -1512,6 +1515,8 @@ void main() {
       ),
     );
 
+    focusNode.requestFocus();
+
     // Now change it to make it obscure text.
     await tester.pumpWidget(MaterialApp(
       home: EditableText(
@@ -1884,7 +1889,7 @@ void main() {
         composing: TextRange(start: 5, end: 14),
       ),
     );
-    final FocusNode focusNode = FocusNode();
+    final FocusNode focusNode = FocusNode(debugLabel: 'Test Focus Node');
 
     await tester.pumpWidget(MaterialApp( // So we can show overlays.
       home: EditableText(

packages/flutter/test/widgets/raw_keyboard_listener_test.dart

@@ -12,7 +12,7 @@ void sendFakeKeyEvent(Map<String, dynamic> data) {
   BinaryMessages.handlePlatformMessage(
     SystemChannels.keyEvent.name,
     SystemChannels.keyEvent.codec.encodeMessage(data),
-    (ByteData data) { },
+    (ByteData data) {},
   );
 }
 
@@ -29,13 +29,15 @@ void main() {
 
     final FocusNode focusNode = FocusNode();
 
-    await tester.pumpWidget(RawKeyboardListener(
+    await tester.pumpWidget(
+      RawKeyboardListener(
         focusNode: focusNode,
         onKey: events.add,
         child: Container(),
-    ));
+      ),
+    );
 
-    tester.binding.focusManager.rootScope.requestFocus(focusNode);
+    focusNode.requestFocus();
     await tester.idle();
 
     sendFakeKeyEvent(<String, dynamic>{
@@ -65,13 +67,15 @@ void main() {
 
     final FocusNode focusNode = FocusNode();
 
-    await tester.pumpWidget(RawKeyboardListener(
+    await tester.pumpWidget(
+      RawKeyboardListener(
         focusNode: focusNode,
         onKey: events.add,
         child: Container(),
-    ));
+      ),
+    );
 
-    tester.binding.focusManager.rootScope.requestFocus(focusNode);
+    focusNode.requestFocus();
     await tester.idle();
 
     sendFakeKeyEvent(<String, dynamic>{

packages/flutter_test/lib/src/binding.dart

@@ -692,6 +692,7 @@ abstract class TestWidgetsFlutterBinding extends BindingBase
     FlutterError.onError = _oldExceptionHandler;
     _pendingExceptionDetails = null;
     _parentZone = null;
+    buildOwner.focusManager = FocusManager();
   }
 }