[integration_test] Wrap pumped widgets with a RepaintBoundary (#70368)

packages/integration_test/lib/integration_test.dart

@@ -412,4 +412,12 @@ class IntegrationTestWidgetsFlutterBinding extends LiveTestWidgetsFlutterBinding
   /// See [TestWidgetsFlutterBinding.defaultTestTimeout] for more details.
   set defaultTestTimeout(Timeout timeout) => _defaultTestTimeout = timeout;
   Timeout _defaultTestTimeout;
+
+  @override
+  void attachRootWidget(Widget rootWidget) {
+    // This is a workaround where screenshots of root widgets have incorrect
+    // bounds.
+    // TODO(jiahaog): Remove when https://github.com/flutter/flutter/issues/66006 is fixed.
+    super.attachRootWidget(RepaintBoundary(child: rootWidget));
+  }
 }

packages/integration_test/test/binding_test.dart

@@ -100,6 +100,13 @@ Future<void> main() async {
         expect(integrationBinding.defaultTestTimeout, newTimeout);
       });
     });
+
+    // TODO(jiahaog): Remove when https://github.com/flutter/flutter/issues/66006 is fixed.
+    testWidgets('root widgets are wrapped with a RepaintBoundary', (WidgetTester tester) async {
+      await tester.pumpWidget(const Placeholder());
+
+      expect(find.byType(RepaintBoundary), findsOneWidget);
+    });
   });
 
   tearDownAll(() async {