Make update_docstrings use MRO instead of hardcoded lexer class.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@38354 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ZSQLCatalog/SearchText/lexer.py

@@ -151,9 +151,10 @@ class lexer(object):
     raise NotImplementedError
 
 def update_docstrings(klass):
+  super_klass = super(klass, klass)
   for property in dir(klass):
     if property.startswith('t_'):
-      source = getattr(lexer, property, None)
+      source = getattr(super_klass, property, None)
       if callable(source):
         destination = getattr(klass, property)
         assert callable(destination)