Add a failing test for an inheritanc context completion issue.

test/completion/flow_analysis.py

@@ -291,3 +291,16 @@ elif 3 == flow_import.env:
 
 #? int() str()
 a
+
+# -----------------
+# Inheritance
+# -----------------
+
+class Super():
+    enabled = True
+    if enabled:
+        yo_dude = 4
+
+class Sub(Super):
+    #? ['yo_dude']
+    yo_dud