Ignore __getitem__ for Generic indirect inheritors (PY-27102)

python/src/com/jetbrains/python/codeInsight/typing/PyTypingInspectionExtension.kt

@@ -36,7 +36,7 @@ class PyTypingInspectionExtension : PyInspectionExtension() {
   private fun isGenericItselfOrDescendant(type: PyClassLikeType,
                                           context: TypeEvalContext): Boolean {
     return PyTypingTypeProvider.GENERIC_CLASSES.contains(type.classQName) ||
-           type.getSuperClassTypes(context).any { PyTypingTypeProvider.GENERIC_CLASSES.contains(it.classQName) }
+           type.getAncestorTypes(context).any { PyTypingTypeProvider.GENERIC_CLASSES.contains(it.classQName) }
   }
 
   private fun isBuiltin(type: PyClassLikeType): Boolean {

python/testData/inspections/PyUnresolvedReferencesInspection3K/typingGenericIndirectInheritorGetItem.py

@@ -0,0 +1,19 @@
+import typing
+
+
+T = typing.TypeVar('T')
+
+
+class X(typing.Generic[T]):
+    pass
+
+
+class Y(X[T]):
+    pass
+
+
+class Z(Y[T]):
+    pass
+
+
+Z[int]

python/testSrc/com/jetbrains/python/inspections/Py3UnresolvedReferencesInspectionTest.java

@@ -215,6 +215,11 @@ public class Py3UnresolvedReferencesInspectionTest extends PyInspectionTestCase
     doTest();
   }
 
+  // PY-27102
+  public void testTypingGenericIndirectInheritorGetItem() {
+    doTest();
+  }
+
   // PY-21655
   public void testUsageOfFunctionDecoratedWithAsyncioCoroutine() {
     doMultiFileTest("a.py");