Disable the hint produced when invoking a super member that is abstract when super-in-mixins is sup…

pkg/analyzer/lib/src/generated/resolver.dart

Index: pkg/analyzer/lib/src/generated/resolver.dart
diff --git a/pkg/analyzer/lib/src/generated/resolver.dart b/pkg/analyzer/lib/src/generated/resolver.dart
index 7a36d8567c0e168b753a370602bc0c66a4b1d8eb..8208abbfe923603b2f852b39bde53ed54385d070 100644
--- a/pkg/analyzer/lib/src/generated/resolver.dart
+++ b/pkg/analyzer/lib/src/generated/resolver.dart
@@ -424,7 +424,8 @@ class BestPracticesVerifier extends RecursiveAstVisitor<Object> {
 
   void _checkForAbstractSuperMemberReference(
       Expression target, SimpleIdentifier name) {
-    if (target is SuperExpression) {
+    if (target is SuperExpression &&
+        !_currentLibrary.context.analysisOptions.enableSuperMixins) {
       Element element = name.staticElement;
       if (element is ExecutableElement && element.isAbstract) {
         if (!_enclosingClass.hasNoSuchMethod) {