~do not accept self nested classes in class declaration if they inherit nested classes from superclass (IDEA-55510)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/genericsHighlighting/IDEA55510.java

@@ -0,0 +1,14 @@
+abstract class IdeaBugTest<M extends IdeaBugTest.Mapping>
+{
+        static class Mapping {}
+}
+
+class BugTestSub extends IdeaBugTest<<error descr="SubMapping is not accessible in current context">BugTestSub.SubMapping</error>>
+{
+        public abstract static class SubMapping extends Mapping {}
+}
+
+class BugTestSub1 extends IdeaBugTest<BugTestSub1.SubMapping>
+{
+        public abstract static class SubMapping extends IdeaBugTest.Mapping {} //fqn here
+}