[flutter_tools] Decouple fatal-warnings check from fatal-infos (#113748)

packages/flutter_tools/lib/src/commands/analyze_once.dart

@@ -167,8 +167,7 @@ class AnalyzeOnce extends AnalyzeBase {
       if (severityLevel == AnalysisSeverity.error) {
         return true;
       }
-      if (severityLevel == AnalysisSeverity.warning &&
-        (argResults['fatal-warnings'] as bool || argResults['fatal-infos'] as bool)) {
+      if (severityLevel == AnalysisSeverity.warning && argResults['fatal-warnings'] as bool) {
         return true;
       }
       if (severityLevel == AnalysisSeverity.info && argResults['fatal-infos'] as bool) {

packages/flutter_tools/test/integration.shard/analyze_once_test.dart

@@ -339,7 +339,7 @@ int analyze() {}
     );
   });
 
-  testWithoutContext('analyze once only fatal-infos has warning issue finally exit code 1.', () async {
+  testWithoutContext('analyze once only fatal-infos has warning issue finally exit code 0.', () async {
     const String warningSourceCode = '''
 int analyze() {}
 ''';
@@ -359,6 +359,30 @@ analyzer:
         'missing_return',
       ],
       exitMessageContains: '1 issue found.',
+    );
+  });
+
+
+  testWithoutContext('analyze once only fatal-warnings has warning issue finally exit code 1.', () async {
+    const String warningSourceCode = '''
+int analyze() {}
+''';
+
+    final File optionsFile = fileSystem.file(fileSystem.path.join(projectPath, 'analysis_options.yaml'));
+    optionsFile.writeAsStringSync('''
+analyzer:
+  errors:
+    missing_return: warning
+  ''');
+
+    fileSystem.directory(projectPath).childFile('main.dart').writeAsStringSync(warningSourceCode);
+    await runCommand(
+      arguments: <String>['analyze','--no-pub', '--no-fatal-infos', '--fatal-warnings'],
+      statusTextContains: <String>[
+        'warning',
+        'missing_return',
+      ],
+      exitMessageContains: '1 issue found.',
       exitCode: 1,
     );
   });