[FIX] [IMP] mail: fixed mail sent to users being redirected to their partner profile

leading to potential issues.

Now the behavior is back to its previous version, posting on the user creates a private
discussion. Fixed management of model variable in message_post to avoid posting messages
on the mail.thread model.

Classic inbox writes on partner, with hr it writes on the employee profile, like previously.

addons/mail/mail_thread.py

@@ -1549,8 +1549,8 @@ class mail_thread(osv.AbstractModel):
         # set in the context.
         model = False
         if thread_id:
-            model = context.get('thread_model', self._name) if self._name == 'mail.thread' else self._name
-            if model != self._name and hasattr(self.pool[model], 'message_post'):
+            model = context.get('thread_model', False) if self._name == 'mail.thread' else self._name
+            if model and model != self._name and hasattr(self.pool[model], 'message_post'):
                 del context['thread_model']
                 return self.pool[model].message_post(cr, uid, thread_id, body=body, subject=subject, type=type, subtype=subtype, parent_id=parent_id, attachments=attachments, context=context, content_subtype=content_subtype, **kwargs)
 
@@ -1603,7 +1603,7 @@ class mail_thread(osv.AbstractModel):
             self.message_subscribe(cr, uid, [thread_id], list(partner_to_subscribe), context=context)
 
         # _mail_flat_thread: automatically set free messages to the first posted message
-        if self._mail_flat_thread and not parent_id and thread_id:
+        if self._mail_flat_thread and model and not parent_id and thread_id:
             message_ids = mail_message.search(cr, uid, ['&', ('res_id', '=', thread_id), ('model', '=', model)], context=context, order="id ASC", limit=1)
             parent_id = message_ids and message_ids[0] or False
         # we want to set a parent: force to set the parent_id to the oldest ancestor, to avoid having more than 1 level of thread
@@ -1622,7 +1622,7 @@ class mail_thread(osv.AbstractModel):
         values.update({
             'author_id': author_id,
             'model': model,
-            'res_id': thread_id or False,
+            'res_id': model and thread_id or False,
             'body': body,
             'subject': subject or False,
             'type': type,
@@ -1644,7 +1644,7 @@ class mail_thread(osv.AbstractModel):
             # done with SUPERUSER_ID, because on some models users can post only with read access, not necessarily write access
             self.write(cr, SUPERUSER_ID, [thread_id], {'message_last_post': fields.datetime.now()}, context=context)
         message = mail_message.browse(cr, uid, msg_id, context=context)
-        if message.author_id and thread_id and type != 'notification' and not context.get('mail_create_nosubscribe'):
+        if message.author_id and model and thread_id and type != 'notification' and not context.get('mail_create_nosubscribe'):
             self.message_subscribe(cr, uid, [thread_id], [message.author_id.id], context=context)
         return msg_id
 

addons/mail/mail_thread_view.xml

@@ -8,6 +8,7 @@
             <field name="context">{
               'default_model': 'res.users',
               'default_res_id': uid,
+              'thread_model': 'res.partner',
               'needaction_menu_ref': ['mail.mail_tomefeeds', 'mail.mail_starfeeds']
             }</field>
             <field name="params" eval="&quot;{
@@ -38,6 +39,7 @@
             <field name="context">{
               'default_model': 'res.users',
               'default_res_id': uid,
+              'thread_model': 'res.partner',
               'search_default_message_unread': True,
               'needaction_menu_ref': ['mail.mail_starfeeds', 'mail.mail_inboxfeeds']
             }</field>
@@ -65,6 +67,7 @@
             <field name="context">{
               'default_model': 'res.users',
               'default_res_id': uid,
+              'thread_model': 'res.partner',
               'search_default_message_unread': True
             }</field>
             <field name="params" eval="&quot;{
@@ -92,6 +95,7 @@
             <field name="context">{
               'default_model': 'res.users',
               'default_res_id': uid,
+              'thread_model': 'res.partner',
               'needaction_menu_ref': ['mail.mail_tomefeeds', 'mail.mail_starfeeds', 'mail.mail_inboxfeeds']
             }</field>
             <field name="params" eval="&quot;{

addons/mail/res_users.py

@@ -118,7 +118,7 @@ class res_users(osv.Model):
 
     @api.cr_uid_ids_context
     def message_post(self, cr, uid, thread_id, context=None, **kwargs):
-        """ Redirect the posting of message on res.users to the related partner.
+        """ Redirect the posting of message on res.users as a private discussion.
             This is done because when giving the context of Chatter on the
             various mailboxes, we do not have access to the current partner_id. """
         if isinstance(thread_id, (list, tuple)):
@@ -136,7 +136,9 @@ class res_users(osv.Model):
         if user_pid not in current_pids:
             partner_ids.append(user_pid)
         kwargs['partner_ids'] = partner_ids
-        return self.pool['res.partner'].message_post(cr, uid, user_pid, **kwargs)
+        if context and context.get('thread_model') == 'res.partner':
+            return self.pool['res.partner'].message_post(cr, uid, user_pid, **kwargs)
+        return self.pool['mail.thread'].message_post(cr, uid, uid, **kwargs)
 
     def message_update(self, cr, uid, ids, msg_dict, update_vals=None, context=None):
         return True

addons/portal/portal_view.xml

@@ -17,6 +17,7 @@
             <field name="context">{
               'default_model': 'res.users',
               'default_res_id': uid,
+              'thread_model': 'res.partner',
             }</field>
             <field name="params" eval="&quot;{
                 'domain': [
@@ -47,6 +48,7 @@
             <field name="context">{
               'default_model': 'res.users',
               'default_res_id': uid,
+              'thread_model': 'res.partner',
               'search_default_message_unread': True
             }</field>
             <field name="params" eval="&quot;{
@@ -76,7 +78,8 @@
             <field name="tag">mail.wall</field>
             <field name="context">{
               'default_model': 'res.users',
-              'default_res_id': uid
+              'default_res_id': uid,
+              'thread_model': 'res.partner',
             }</field>
             <field name="params" eval="&quot;{
                 'domain': [