[FIX] point_of_sale: Add sales description to pos invoice

Current behavior:
If you add a sale description to a product, it will not be added to the
invoice created from the PoS.

Steps to reproduce:
- Add a sale description to a product
- Create a PoS order with this product
- Create an invoice from the PoS order
- The sale description is not added to the invoice

opw-3221481

closes odoo/odoo#119516

X-original-commit: 37538c876f30fb1b3a9368f12a16edb1806777f8
Signed-off-by: Joseph Caburnay (jcb) <jcb@odoo.com>
Signed-off-by: Heinz Robin (rhe) <rhe@odoo.com>
Signed-off-by: Engels Robin (roen) <roen@odoo.com>

addons/point_of_sale/models/pos_order.py

@@ -196,12 +196,14 @@ class PosOrder(models.Model):
             order.add_payment(return_payment_vals)
 
     def _prepare_invoice_line(self, order_line):
+        display_name = order_line.product_id.get_product_multiline_description_sale()
+        name = order_line.product_id.default_code + " " + display_name if order_line.product_id.default_code else display_name
         return {
             'product_id': order_line.product_id.id,
             'quantity': order_line.qty if self.amount_total >= 0 else -order_line.qty,
             'discount': order_line.discount,
             'price_unit': order_line.price_unit,
-            'name': order_line.product_id.display_name or order_line.full_product_name,
+            'name': name,
             'tax_ids': [(6, 0, order_line.tax_ids_after_fiscal_position.ids)],
             'product_uom_id': order_line.product_uom_id.id,
         }