[FIX] stock: add origin to the chatter when creating a picking from a sale order

Before v11, the picking origin was added to the chatter, which is a useful
feature.
We add it back.

opw 1874379

addons/sale_stock/models/stock.py

@@ -43,6 +43,14 @@ class StockMove(models.Model):
                         line.qty_delivered = line._get_delivered_qty()
         return res
 
+    def _assign_picking_post_process(self, new=False):
+        super(StockMove, self)._assign_picking_post_process(new=new)
+        if new and self.sale_line_id and self.sale_line_id.order_id:
+            self.picking_id.message_post_with_view(
+                'mail.message_origin_link',
+                values={'self': self.picking_id, 'origin': self.sale_line_id.order_id},
+                subtype_id=self.env.ref('mail.mt_note').id)
+
 
 class ProcurementGroup(models.Model):
     _inherit = 'procurement.group'

addons/stock/models/stock_move.py

@@ -704,7 +704,7 @@ class StockMove(models.Model):
                 recompute = True
                 picking = Picking.create(move._get_new_picking_values())
             move.write({'picking_id': picking.id})
-
+            move._assign_picking_post_process(new=recompute)
             # If this method is called in batch by a write on a one2many and
             # at some point had to create a picking, some next iterations could
             # try to find back the created picking. As we look for it by searching
@@ -714,6 +714,9 @@ class StockMove(models.Model):
                 move.recompute()
         return True
 
+    def _assign_picking_post_process(self, new=False):
+        pass
+
     def _get_new_picking_values(self):
         """ Prepares a new picking for this move as it could not be assigned to
         another picking. This method is designed to be inherited. """