Fixed leak and removed no-shuffle tag in window_test.dart (#93604)

packages/flutter_test/test/window_test.dart

@@ -2,12 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// TODO(gspencergoog): Remove this tag once this test's state leaks/test
-// dependencies have been fixed.
-// https://github.com/flutter/flutter/issues/85160
-// Fails with "flutter test --test-randomize-ordering-seed=123"
-@Tags(<String>['no-shuffle'])
-
 import 'dart:ui' as ui show window;
 import 'dart:ui' show Size, Locale, WindowPadding, AccessibilityFeatures, Brightness;
 
@@ -193,11 +187,13 @@ void main() {
   });
 
   testWidgets('TestWindow sends fake locales when WidgetsBindingObserver notifiers are called', (WidgetTester tester) async {
+    final List<Locale> defaultLocales = WidgetsBinding.instance!.window.locales;
     final TestObserver observer = TestObserver();
     retrieveTestBinding(tester).addObserver(observer);
     final List<Locale> expectedValue = <Locale>[const Locale('fake_language_code')];
     retrieveTestBinding(tester).window.localesTestValue = expectedValue;
     expect(observer.locales, equals(expectedValue));
+    retrieveTestBinding(tester).window.localesTestValue = defaultLocales;
   });
 }