Ignore DismissIntent when barrier is not dismissible (#70156)

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

@@ -650,9 +650,19 @@ mixin LocalHistoryRoute<T> on Route<T> {
 }
 
 class _DismissModalAction extends DismissAction {
+  _DismissModalAction(this.context);
+
+  final BuildContext context;
+
+  @override
+  bool isEnabled(DismissIntent intent) {
+    final ModalRoute<dynamic> route = ModalRoute.of<dynamic>(context)!;
+    return route.barrierDismissible;
+  }
+
   @override
   Object invoke(DismissIntent intent) {
-    return Navigator.of(primaryFocus!.context!)!.maybePop();
+    return Navigator.of(context)!.maybePop();
   }
 }
 
@@ -767,10 +777,6 @@ class _ModalScopeState<T> extends State<_ModalScope<T>> {
     setState(fn);
   }
 
-  static final Map<Type, Action<Intent>> _actionMap = <Type, Action<Intent>>{
-    DismissIntent: _DismissModalAction(),
-  };
-
   @override
   Widget build(BuildContext context) {
     return AnimatedBuilder(
@@ -790,8 +796,12 @@ class _ModalScopeState<T> extends State<_ModalScope<T>> {
           offstage: widget.route.offstage, // _routeSetState is called if this updates
           child: PageStorage(
             bucket: widget.route._storageBucket, // immutable
-            child: Actions(
+            child: Builder(
-              actions: _actionMap,
+              builder: (BuildContext context) {
+                return Actions(
+                  actions: <Type, Action<Intent>>{
+                    DismissIntent: _DismissModalAction(context),
+                  },
                   child: FocusScope(
                     node: focusScopeNode, // immutable
                     child: RepaintBoundary(
@@ -835,6 +845,8 @@ class _ModalScopeState<T> extends State<_ModalScope<T>> {
                       ),
                     ),
                   ),
+                );
+              },
             ),
           ),
         ),

packages/flutter/test/material/debug_test.dart

@@ -137,6 +137,7 @@ void main() {
       '     FocusScope\n'
       '     _ActionsMarker\n'
       '     Actions\n'
+      '     Builder\n'
       '     PageStorage\n'
       '     Offstage\n'
       '     _ModalScopeStatus\n'

packages/flutter/test/widgets/routes_test.dart

@@ -1641,6 +1641,29 @@ void main() {
     expect(find.text('dialog1'), findsNothing);
   });
 
+  testWidgets('can not be dismissed with escape keyboard shortcut if barrier not dismissible', (WidgetTester tester) async {
+    final GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();
+    await tester.pumpWidget(MaterialApp(
+      navigatorKey: navigatorKey,
+      home: const Text('dummy1'),
+    ));
+    final Element textOnPageOne = tester.element(find.text('dummy1'));
+
+    // Show a simple dialog
+    showDialog<void>(
+      context: textOnPageOne,
+      barrierDismissible: false,
+      builder: (BuildContext context) => const Text('dialog1'),
+    );
+    await tester.pumpAndSettle();
+    expect(find.text('dialog1'), findsOneWidget);
+
+    // Try to dismiss the dialog with the shortcut key
+    await tester.sendKeyEvent(LogicalKeyboardKey.escape);
+    await tester.pumpAndSettle();
+    expect(find.text('dialog1'), findsOneWidget);
+  });
+
   testWidgets('ModalRoute.of works for void routes', (WidgetTester tester) async {
     final GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();
     await tester.pumpWidget(MaterialApp(