ERP5Workflow: fix aquisition when sorting the object list in objectValues

This fixes testSimulationElementPerformance (AttributeError: aq_inner)

product/ERP5Type/Core/ERP5PersistentMappingFolder.py

@@ -118,7 +118,7 @@ class ERP5PersistentMappingFolder(PortalFolderBase):
                      if meta_type.startswith('ERP5 ')]
 
     try:
-      object_list = self._object_dict.values()
+      object_list = [o.__of__(self) for o in self._object_dict.values()]
     except AttributeError:
       if self._object_dict is None:
         return []
@@ -127,14 +127,13 @@ class ERP5PersistentMappingFolder(PortalFolderBase):
     if portal_type is not None:
       if isinstance(portal_type, str):
         portal_type = (portal_type,)
-      object_list = [x for x in object_list if x.getPortalType() in portal_type]
+      object_list = [o for o in object_list if o.getPortalType() in portal_type]
 
     if checked_permission is not None:
       checkPermission = getSecurityManager().checkPermission
       object_list = [o for o in object_list
                        if checkPermission(checked_permission, o)]
-    return [x.__of__(self) for x in sortValueList(object_list, sort_on,
-                                                  sort_order, **kw)]
+    return sortValueList(object_list, sort_on, sort_order, **kw)
 
   security.declareProtected(Permissions.AccessContentsInformation,
                             'keys', 'items', 'values')