sale_order_product_picker: editing amount and discarding is insconsistent

[yajo]

Module

sale_order_product_picker

Describe the bug

When the user saves a value, and then edits again and discards, there's an inconsistency in the value that is stored in Odoo.

To Reproduce

Affected versions: 16

Steps to reproduce the behavior:

2023-12-12.09-25-04.mp4

Expected behavior
Discarding edits should restore the state of the last edit, not the sate of the order line before any edits. Just like normal Odoo.

Additional context
Tested on runboat.

@moduon MT-4396

[rafaelbn]

@CarlosRoca13 @sergio-teruel could you take a look on this please? Just know your opinion. Thank you! 😄