[FIX] sale: performance hit in sale.order.line creation (#20417)

The access to the state of sale.order.line (related field) seems very slow for big sale order. Bypassing the related field and using the real field instead, improves performance.

addons/sale/models/sale.py

@@ -696,7 +696,7 @@ class SaleOrderLine(models.Model):
     def create(self, values):
         values.update(self._prepare_add_missing_fields(values))
         line = super(SaleOrderLine, self).create(values)
-        if line.state == 'sale':
+        if line.order_id.state == 'sale':
             line._action_procurement_create()
             msg = _("Extra line with %s ") % (line.product_id.display_name,)
             line.order_id.message_post(body=msg)