models: do not aggregate delegate recursively when computing the set of users to notify about a document

docbow_project/docbow/models.py

@@ -734,8 +734,7 @@ class DocbowProfile(Model):
 class NotificationManager(Manager):
     def notify(self, document=None, users=None, kind='new-document', ctx=None):
         '''Build notifications in bulk'''
-        users = utils.queryset_fixpoint(users, 
-                lambda s: User.objects.filter(delegations_by__by__in=s))
+        users = set(users) | set(User.objects.filter(delegations_by__by__in=users))
         users = User.objects.filter(pk__in=[u.pk for u in users]) \
                 .exclude(docbowprofile__accept_notifications=False)
         notifications = [Notification(user=user, document=document, kind=kind, ctx=ctx)