When using complex sub-totals, the total sum of taxes was always removed
from the total amount.
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This also allows more flexibility for ordering tax groups.
Before cd6c33575b, it was possible to have this:
* Tax Exempt 2% (preceeding subtotal "Discounted")
* VAT 21% (no preceeding subtotal, take default)
* Reapply 2% (preceeding subtotal "Reapply")
The value for groups without preceeding subtotals was always 0 and
* before the commit mentionned above, it was possible to reach 0 too for
the groups with a preceeding subtotal
* but after +1 was added making it impossible from the view
We now always take the group's order (or the smallest one for groups
without a preceeding subtotal)
Followup on d8d47f9ff8
task-2956509
X-original-commit: d3471336b85f17fe274acf6a01b71c5d1483e94a
Part-of: odoo/odoo#101994
william
b8729a7e60