Fix spell_check_test (#110814)

dev/integration_tests/non_nullable/android/app/src/main/res/drawable/launch_background.xml

+<?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2014 The Flutter Authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file. -->
 
-<?xml version="1.0" encoding="utf-8"?>
 <!-- Modify this file to customize your launch splash screen -->
 <layer-list xmlns:android="http://schemas.android.com/apk/res/android">
     <item android:drawable="@android:color/white" />

dev/integration_tests/spell_check/android/app/src/main/res/values/styles.xml

+<?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2014 The Flutter Authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file. -->
 
-<?xml version="1.0" encoding="utf-8"?>
 <resources>
     <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is off -->
     <style name="LaunchTheme" parent="@android:style/Theme.Light.NoTitleBar">

dev/integration_tests/spell_check/integration_test/integration_test.dart

@@ -147,7 +147,7 @@ Future<void> main() async {
 
     await tester.pumpWidget(const MyApp());
 
-    await tester.enterText(find.byType(EditableText), 'Hey wrororld! Hey!');
+    await tester.enterText(find.byType(EditableText), 'Hey cfabiueqqocnakoef! Hey!');
     await tester.pumpAndSettle();
 
     final RenderEditable renderEditable = findRenderEditable(tester, EditableText);
@@ -157,7 +157,7 @@ Future<void> main() async {
         style: style,
         children: <TextSpan>[
           TextSpan(style: style, text: 'Hey '),
-          TextSpan(style: misspelledTextStyle, text: 'wrororld'),
+          TextSpan(style: misspelledTextStyle, text: 'cfabiueqqocnakoef'),
           TextSpan(style: style, text: '! Hey!'),
         ]);
 

packages/flutter/lib/src/services/spell_check.dart

@@ -211,9 +211,8 @@ class DefaultSpellCheckService implements SpellCheckService {
       if (textHasNotChanged && spansHaveChanged) {
         suggestionSpans = mergeResults(lastSavedResults!.suggestionSpans, suggestionSpans);
       }
-
-      lastSavedResults = SpellCheckResults(text, suggestionSpans);
     }
+    lastSavedResults = SpellCheckResults(text, suggestionSpans);
 
     return suggestionSpans;
   }

packages/integration_test/example/android/app/src/main/res/drawable/launch_background.xml

+<?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2014 The Flutter Authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file. -->
 
-<?xml version="1.0" encoding="utf-8"?>
 <!-- Modify this file to customize your launch splash screen -->
 <layer-list xmlns:android="http://schemas.android.com/apk/res/android">
     <item android:drawable="@android:color/white" />