quick fix for SEALED_MIXIN_CLASS

Change-Id: I32e120d40301ac6fe7e3f239b29e0127815be69d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/368882
Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Auto-Submit: Phil Quitslund <pquitslund@google.com>

pkg/analysis_server/lib/src/services/correction/error_fix_status.yaml

@@ -45,8 +45,8 @@
 #
 # Stats:
 # -  42 "needsEvaluation"
-# - 354 "needsFix"
-# - 397 "hasFix"
+# - 353 "needsFix"
+# - 398 "hasFix"
 # - 516 "noFix"
 
 AnalysisOptionsErrorCode.INCLUDED_FILE_PARSE_ERROR:
@@ -3237,9 +3237,7 @@ ParserErrorCode.SEALED_MIXIN:
   notes: |-
     Remove the `sealed` keyword.
 ParserErrorCode.SEALED_MIXIN_CLASS:
-  status: needsFix
-  notes: |-
-    Remove the `sealed` keyword.
+  status: hasFix
 ParserErrorCode.SETTER_CONSTRUCTOR:
   status: needsFix
   notes: |-

pkg/analysis_server/lib/src/services/correction/fix_internal.dart

@@ -1415,6 +1415,9 @@ final _builtInNonLintProducers = <ErrorCode, List<ProducerGenerator>>{
   ParserErrorCode.RECORD_TYPE_ONE_POSITIONAL_NO_TRAILING_COMMA: [
     AddTrailingComma.new,
   ],
+  ParserErrorCode.SEALED_MIXIN_CLASS: [
+    RemoveExtraModifier.new,
+  ],
   ParserErrorCode.VAR_AND_TYPE: [
     RemoveTypeAnnotation.fixVarAndType,
     RemoveVar.new,

pkg/analysis_server/test/src/services/correction/fix/remove_extra_modifier_test.dart

@@ -131,6 +131,15 @@ typedef F();
 ''');
   }
 
+  Future<void> test_class_sealed_mixin() async {
+    await resolveTestCode('''
+sealed mixin class A {}
+''');
+    await assertHasFix('''
+mixin class A {}
+''');
+  }
+
   Future<void> test_covariantTopLevelDeclaration_class() async {
     await resolveTestCode(r'''
 covariant class C {}