Python: API-graphs: test class decorators and subclass

A class decorator could change the class definition in any way.

In this specific case, it would be better if we allowed the subclass to
be found with API graphs still.

inspired by
https://github.com/django/django/blob/c2250cfb80e27cdf8d098428824da2800a18cadf/tests/auth_tests/test_views.py#L40-L46

Author: RasmusWL

python/ql/test/library-tests/ApiGraphs/py3/deftest2.py

@@ -16,4 +16,19 @@ class IntMyView(View): #$ use=moduleImport("pflask").getMember("views").getMembe
         def my_internal_method(self): #$ def=moduleImport("pflask").getMember("views").getMember("View").getASubclass().getMember("my_internal_method")
             pass
 
-    int_instance = IntMyView() #$ use=moduleImport("pflask").getMember("views").getMember("View").getASubclass().getReturn()
+    int_instance = IntMyView() #$ use=moduleImport("pflask").getMember("views").getMember("View").getASubclass().getReturn()
+
+# ------------------------------------------------------------------------------
+# Class decorator
+# ------------------------------------------------------------------------------
+
+def my_class_decorator(cls):
+    print("dummy decorator")
+    return cls
+
+@my_class_decorator
+class MyViewWithDecorator(View): #$ use=moduleImport("flask").getMember("views").getMember("View").getASubclass()
+    pass
+
+class SubclassFromDecorated(MyViewWithDecorator): #$ MISSING: use=moduleImport("flask").getMember("views").getMember("View").getASubclass().getASubclass()
+    pass