[FIX] project: filter "Followed by Me"

The filter "Followed by Me" depends on a calculated field is not stored.
Therefore, we need to redefine the search method.

Fixes #8920

addons/project/project.py

@@ -326,6 +326,13 @@ class project(osv.osv):
             tasks.write({'active': vals['active']})
         return res
 
+    def search(self, cr, uid, args, offset=0, limit=None, order=None, context=None, count=False):
+        context = dict(context or {})
+        if context.get('message_is_follower', False):
+            res = super(project, self).search(cr, uid, args, offset=offset, limit=limit, order=order, context=context, count=count)
+            return [proj.id for proj in self.browse(cr, uid, res, context=context) if proj.message_is_follower]
+        return super(project, self).search(cr, uid, args, offset=offset, limit=limit, order=order, context=context, count=count)
+
 
 class task(osv.osv):
     _name = "project.task"

addons/project/project_view.xml

@@ -162,7 +162,7 @@
                     <filter string="Pending" name="Pending" domain="[('state', '=','pending')]"/>
                     <separator/>
                     <filter string="Manager" domain="[('user_id','=',uid)]"/>
-                    <filter string="Followed by Me" domain="[('message_is_follower','=',True)]"/>
+                    <filter string="Followed by Me" context="{'message_is_follower': True}"/>
                     <separator/>
                     <filter string="Important Messages" name="message_needaction" domain="[('message_needaction','=',True)]"/>
                     <filter string="Archived" name="inactive" domain="[('active','=',False)]"/>