## Impacted versions:
 8.0 / 9.0 / 10.0
## Steps to reproduce:
* see https://github.com/odoo/odoo/issues/11841
* in a shell
  1. create an in memory record `order = self.env['purcahse.order'].new({....})`
  2. create an in memory record with a reference to the first one `order_line = self.env['purchase.order.line'].new({'order_id': order, ....})`
  3. order_line.order_id is an in memory recordset
  4. create a record for a model that inherits from mail.thread `self.env['product.product'].create({....})`
  5. At this stage order_line.order_id is an empty recordset

## Current behavior:
 In memory records are dropped when a call is done to self.invalidate_cache
## Expected behavior:
In memory records are preserved when a call is done to self.invalidate_cache


There are lot of places where the method `invalidate_cache` is called and the silent removal of the in memory records from all environments has unpredictable effects on fields modified by a computed method or an onchange or even related fields .... Moreover since all caches are invalidated each time you create / write / unlink  (https://github.com/odoo/odoo/blob/10.0/addons/mail/models/mail_followers.py#L111) an instance of a model that inherits from 'mail.thread', the performances of the server are severely penalized.

OPW703903

)
        action = mail_thread.message_redirect_action(self.mail_thread, cr, self.user_raoul_id, {'params': {'model': 'mail.group', 'res_id': group_pigs.id}})
        self.assertEqual(
            action.get('type'), 'ir.actions.act_window',
            'URL redirection: action with message_id for read-accredited user should redirect to Pigs'
        )
        self.assertEqual(
            action.get('res_id'), group_pigs.id,
            'URL redirection: action with message_id for read-accredited user should redirect to Pigs'
        )
        
        action = mail_thread.message_redirect_action(self.mail_thread, cr, self.user_bert_id, {'params': {'message_id': msg_id}})
        self.assertEqual(
            action.get('type'), 'ir.actions.client',
            'URL redirection: action without parameters should redirect to client action Inbox'
        )
        self.assertEqual(
            action.get('id'), act_id,
            'URL redirection: action without parameters should redirect to client action Inbox'
        )
        action = mail_thread.message_redirect_action(self.mail_thread, cr, self.user_bert_id, {'params': {'model': 'mail.group', 'res_id': group_pigs.id}})
        self.assertEqual(
            action.get('type'), 'ir.actions.client',
            'URL redirection: action without parameters should redirect to client action Inbox'
        )
        self.assertEqual(
            action.get('id'), act_id,
            'URL redirection: action without parameters should redirect to client action Inbox'
        )
    def test_20_message_post(self):