SearchDelegate should dispose resources. (#133948)

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

@@ -377,6 +377,15 @@ abstract class SearchDelegate<T> {
   }
 
   _SearchPageRoute<T>? _route;
+
+  /// Releases the resources.
+  @mustCallSuper
+  void dispose() {
+    _currentBodyNotifier.dispose();
+    _focusNode?.dispose();
+    _queryTextController.dispose();
+    _proxyAnimation.parent = null;
+  }
 }
 
 /// Describes the body that is currently shown under the [AppBar] in the

packages/flutter/test/material/search_test.dart

@@ -6,6 +6,7 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:leak_tracker_flutter_testing/leak_tracker_flutter_testing.dart';
 
 import '../widgets/clipboard_utils.dart';
 import '../widgets/semantics_tester.dart';
@@ -25,8 +26,9 @@ void main() {
     TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(SystemChannels.platform, null);
   });
 
-  testWidgets('Changing query moves cursor to the end of query', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('Changing query moves cursor to the end of query', (WidgetTester tester) async {
     final _TestSearchDelegate delegate = _TestSearchDelegate();
+    addTearDown(() => delegate.dispose());
 
     await tester.pumpWidget(TestHomePage(delegate: delegate));
     await tester.tap(find.byTooltip('Search'));

packages/flutter/test/material/segmented_button_test.dart

@@ -22,9 +22,7 @@ Widget boilerplate({required Widget child}) {
 
 void main() {
 
-  testWidgetsWithLeakTracking('SegmentedButton is built with Material of type MaterialType.transparency',
-  leakTrackingTestConfig: LeakTrackingTestConfig.debugNotDisposed(),
-  (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('SegmentedButton is built with Material of type MaterialType.transparency', (WidgetTester tester) async {
     final ThemeData theme = ThemeData(useMaterial3: true);
     await tester.pumpWidget(
       MaterialApp(