f26b94f had as goal to filter the taxes of the product
according to the company when the sale.order
was created/edited as SUPERUSER_ID
(Who ignores the record rules).
Unfortunetaly, to filter the taxes,
it used the company of the customer,
while it's actually the company of the order which
should be used.
Indeed, for instance,
partners can be shared among all companies.
It was way less simple to access the company
of the sale.order, this parameter being
not available in the on_change method signature.
This is the easiest way to solve this issue
without breaking the API / retro-compatibility.
opw-647819
3b02e3d63d