generics: allow foreign interface usage in class type arguments

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

@@ -11,4 +11,12 @@ class BugTestSub extends IdeaBugTest<<error descr="SubMapping is not accessible
 class BugTestSub1 extends IdeaBugTest<BugTestSub1.SubMapping>
 {
         public abstract static class SubMapping extends IdeaBugTest.Mapping {} //fqn here
+}
+
+class AbstractSettings {
+    interface State {}
+}
+interface SomeInterface<T> {}
+class Settings extends AbstractSettings implements SomeInterface<Settings.MyState> {
+    static class MyState implements State {}
 }