ZODB Components: Migration dialog: Only consider Portal Type Document/Tool...

ZODB Components: Migration dialog: Only consider Portal Type Document/Tool class and not all its subclasses.

This makes it easier to migrate only Document/Tool classes to the current bt5,
considering that subclasses below are likely to be used in several places.

product/ERP5/Document/BusinessTemplate.py

@@ -6437,19 +6437,23 @@ Business Template is a set of definitions, such as skins, portal types and categ
               error=True)
           continue
 
-        for cls in (tuple(zope.interface.implementedBy(portal_type_cls)) +
-                    portal_type_cls.mro()):
+        for i, cls in enumerate((portal_type_cls.mro() +
+                                 tuple(zope.interface.implementedBy(portal_type_cls)))):
           if cls in seen_cls_set:
             continue
-          seen_cls_set.add(cls)
-
           cls_module_filepath = self._checkFilesystemModulePath(
             inspect.getmodule(cls),
             working_copy_path_list)
           if cls_module_filepath is not None:
             cls_module_name = cls.__module__
+            if '.Document.' in cls_module_name or '.Tool.' in cls_module_name:
+              if i != 1:
+                continue
+
             yield cls.__name__, cls.__module__, cls_module_filepath
 
+          seen_cls_set.add(cls)
+
     security.declareProtected(Permissions.ManagePortal,
                               'getMigratableSourceCodeFromFilesystemList')
     def getMigratableSourceCodeFromFilesystemList(self,