[FIX] point_of_sale: prevent order duplication due to quantity rounding

Before this commit, it was possible to capture an order twice due to
the rounding difference in quantity, especially when users use a scale.

With this commit, it uses a more relaxed condition and remove the
quantity from the orderline comparison. Given that the system checks
the payments and with the same product and price units, it's unlikely
that two orders will have the same payment amount.

opw-3735436

closes odoo/odoo#155612

X-original-commit: 9f1f8fcd272005eb2cba4bf6feee0ea0b2f2609f
Signed-off-by: Joseph Caburnay (jcb) <jcb@odoo.com>
Signed-off-by: Pedram Bi Ria (pebr) <pebr@odoo.com>

addons/point_of_sale/models/pos_order.py

@@ -969,8 +969,8 @@ class PosOrder(models.Model):
         if len(data['lines']) != len(existing_order.lines):
             return False
 
-        received_lines = sorted([(l[2]['product_id'], l[2]['qty'], l[2]['price_unit']) for l in data['lines']])
-        existing_lines = sorted([(l.product_id.id, l.qty, l.price_unit) for l in existing_order.lines])
+        received_lines = sorted([(l[2]['product_id'], l[2]['price_unit']) for l in data['lines']])
+        existing_lines = sorted([(l.product_id.id, l.price_unit) for l in existing_order.lines])
 
         if received_lines != existing_lines:
             return False