Annotation counter in project page count annotation of removed members

[geektortoise]

Test case :
Create a project, add a user, this user create X annotations, remove the user

Current situation :
Annotation counter is at X.
(There is indeed X user_annotation related to this project into the database )

Expected situation :
Annotation counter is at 0.

Cause : the annotation counter count all the annotations not deleted.
If we remove a member, these annotations are not deleted but are no more accessible.

Should we have a trigger on acl_entry for project and users or should the member removal automatically flag annotation as "deleted" and adding a member should reactive them (conflict with soft deletion of annotations) ?