PrivateMemberAccessBetweenOuterAndInnerClassInspection: switch off for Java 11+

Thanks to nestmates accessors are not generated since Java 11

plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/j2me/PrivateMemberAccessBetweenOuterAndInnerClassInspection.java

@@ -20,6 +20,7 @@ import com.intellij.openapi.project.Project;
 import com.intellij.psi.*;
 import com.intellij.psi.util.FileTypeUtils;
 import com.intellij.psi.util.PsiTreeUtil;
+import com.intellij.psi.util.PsiUtil;
 import com.siyeh.InspectionGadgetsBundle;
 import com.siyeh.ig.BaseInspection;
 import com.siyeh.ig.BaseInspectionVisitor;
@@ -176,7 +177,7 @@ public class PrivateMemberAccessBetweenOuterAndInnerClassInspection extends Base
       // disable for jsp files IDEADEV-12957
       return false;
     }
-    return true;
+    return !PsiUtil.isLanguageLevel11OrHigher(file);
   }
 
   @Override

plugins/InspectionGadgets/src/inspectionDescriptions/PrivateMemberAccessBetweenOuterAndInnerClass.html

@@ -12,8 +12,10 @@ another class. To enable access from an inner class to private members of a
 containing class or the other way around javac creates a package-private
 synthetic accessor method. Less use of memory and greater performance may be achieved by making the
 member package-private, thus allowing direct access without the creation of a synthetic accessor method.
-<!-- tooltip end -->
 <p>
-
+This inspection does not report anything if language level is set to Java 11 or higher
+as thanks to nest-based access control (JEP 181), accessor methods are not generated anymore.
+</p>
+<!-- tooltip end -->
 </body>
 </html>