[IMP] mail: quick-open related record from message

Before this commit if you found a message and wanted to open the related record you would need to find it manually by finding the right view and then using the ID stored on the message to open it.
By adding a smartbutton the user can quick-navigate to the related record in a second.
This allows for quickly finding and opening records which is usually handy when debugging things.
Ref Task-2660873

closes odoo/odoo#77675

closes odoo/odoo#77803

Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

addons/mail/models/mail_message.py

@@ -691,6 +691,17 @@ class Message(models.Model):
             self.update(attachement_values)
         thread._message_update_content_after_hook(self)
 
+    def action_open_document(self):
+        """ Opens the related record based on the model and ID """
+        self.ensure_one()
+        return {
+            'res_id': self.res_id,
+            'res_model': self.model,
+            'target': 'current',
+            'type': 'ir.actions.act_window',
+            'view_mode': 'form',
+        }
+
     # ------------------------------------------------------
     # DISCUSS API
     # ------------------------------------------------------

addons/mail/views/mail_message_views.xml

@@ -25,6 +25,11 @@
             <field name="arch" type="xml">
                 <form string="Message">
                     <sheet>
+                        <div class="oe_button_box" name="button_box">
+                            <button name="action_open_document" string="Open Document"
+                                type="object" class="oe_link" icon="fa-file-text-o"
+                                attrs="{'invisible': ['|', ('model', '=', False), ('res_id', '=', 0)]}"/>
+                        </div>
                         <group>
                             <group>
                                 <field name="subject"/>