Update golden tests (#128914)

examples/api/lib/widgets/text_magnifier/text_magnifier.0.dart

@@ -20,6 +20,7 @@ class TextMagnifierExampleApp extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
+      theme: ThemeData(useMaterial3: false),
       home: Scaffold(
         body: Padding(
           padding: const EdgeInsets.symmetric(horizontal: 48.0),

examples/api/test/painting/linear_gradient.0_test.dart

@@ -20,8 +20,9 @@ void main() {
 
   testWidgets('gradient matches golden', (WidgetTester tester) async {
     await tester.pumpWidget(
-      const MaterialApp(
-        home: SizedBox(
+      MaterialApp(
+        theme: ThemeData(useMaterial3: false),
+        home: const SizedBox(
           width: 800,
           height: 600,
           child: RepaintBoundary(

packages/flutter/test/cupertino/dialog_test.dart

@@ -1183,6 +1183,7 @@ void main() {
   testWidgets('Default cupertino dialog golden', (WidgetTester tester) async {
     await tester.pumpWidget(
       createAppWithButtonThatLaunchesDialog(
+        useMaterial3: false,
         dialogBuilder: (BuildContext context) {
           return MediaQuery(
             data: MediaQuery.of(context).copyWith(textScaleFactor: 3.0),
@@ -1523,8 +1524,10 @@ RenderBox findScrollableActionsSectionRenderBox(WidgetTester tester) {
 
 Widget createAppWithButtonThatLaunchesDialog({
   required WidgetBuilder dialogBuilder,
+  bool? useMaterial3,
 }) {
   return MaterialApp(
+    theme: ThemeData(useMaterial3: useMaterial3),
     home: Material(
       child: Center(
         child: Builder(builder: (BuildContext context) {

packages/flutter/test/rendering/localized_fonts_test.dart

@@ -20,6 +20,7 @@ void main() {
 
       await tester.pumpWidget(
         MaterialApp(
+          theme: ThemeData(useMaterial3: false),
           supportedLocales: const <Locale>[
             Locale('en', 'US'),
             Locale('ja'),
@@ -64,6 +65,7 @@ void main() {
     (WidgetTester tester) async {
       await tester.pumpWidget(
         MaterialApp(
+          theme: ThemeData(useMaterial3: false),
           supportedLocales: const <Locale>[
             Locale('en', 'US'),
             Locale('ja'),
@@ -115,6 +117,7 @@ void main() {
     (WidgetTester tester) async {
       await tester.pumpWidget(
         MaterialApp(
+          theme: ThemeData(useMaterial3: false),
           supportedLocales: const <Locale>[
             Locale('en', 'US'),
             Locale('ja'),

packages/flutter/test/widgets/backdrop_filter_test.dart

@@ -16,6 +16,7 @@ void main() {
   testWidgets("BackdropFilter's cull rect does not shrink", (WidgetTester tester) async {
     await tester.pumpWidget(
       MaterialApp(
+        theme: ThemeData(useMaterial3: false),
         home: Scaffold(
           body: Stack(
             fit: StackFit.expand,
@@ -53,6 +54,7 @@ void main() {
   testWidgets('BackdropFilter blendMode on saveLayer', (WidgetTester tester) async {
     await tester.pumpWidget(
       MaterialApp(
+        theme: ThemeData(useMaterial3: false),
         home: Scaffold(
           body: Opacity(
             opacity: 0.9,

packages/flutter/test/widgets/page_route_builder_test.dart

@@ -18,6 +18,7 @@ class TestPage extends StatelessWidget {
     return MaterialApp(
       title: 'Test',
       theme: ThemeData(
+        useMaterial3: false,
         primarySwatch: Colors.blue,
       ),
       home: const HomePage(),

packages/flutter/test/widgets/selectable_text_test.dart

@@ -5080,8 +5080,9 @@ void main() {
 
   testWidgets('text selection style 1', (WidgetTester tester) async {
     await tester.pumpWidget(
-      const MaterialApp(
-        home: Material(
+      MaterialApp(
+        theme: ThemeData(useMaterial3: false),
+        home: const Material(
           child: Center(
             child: Column(
               children: <Widget>[
@@ -5132,8 +5133,9 @@ void main() {
 
   testWidgets('text selection style 2', (WidgetTester tester) async {
     await tester.pumpWidget(
-      const MaterialApp(
-        home: Material(
+      MaterialApp(
+        theme: ThemeData(useMaterial3: false),
+        home: const Material(
           child: Center(
             child: Column(
               children: <Widget>[