[FIX] account: Fix next sequence number on invoices

- Create a journal.
- Create a vendor bill on this journal.
=> Odoo allows you to set a starting sequence number for your invoice.

This number must always use the sequence used when posting the invoice.
However, the invoice date was taken instead of the accounting date.

Before this commit, when setting an invoice date at Y and an accounting date at Y - 1,
the edited sequence was the one in Y - 1 but at the one in Y was used at the validation.

Manual forward-port of 42579

closes odoo/odoo#42914

X-original-commit: 525b5b1a8676e4d1ed1082505c33afb29fed6a42
Signed-off-by: oco-odoo <oco-odoo@users.noreply.github.com>

addons/account/models/account_move.py

@@ -1095,7 +1095,7 @@ class AccountMove(models.Model):
                     vendor_display_name = _('#Created by: %s') % (move.sudo().create_uid.name or self.env.user.name)
             move.invoice_partner_display_name = vendor_display_name
 
-    @api.depends('state', 'journal_id', 'invoice_date')
+    @api.depends('state', 'journal_id', 'date', 'invoice_date')
     def _compute_invoice_sequence_number_next(self):
         """ computes the prefix of the number that will be assigned to the first invoice/bill/refund of a journal, in order to
         let the user manually change it.
@@ -1130,8 +1130,9 @@ class AccountMove(models.Model):
                 continue
 
             for move in group:
-                prefix, dummy = sequence._get_prefix_suffix(date=move.invoice_date or fields.Date.today(), date_range=move.invoice_date)
-                number_next = sequence._get_current_sequence(sequence_date=move.date).number_next_actual
+                sequence_date = move.date or move.invoice_date
+                prefix, dummy = sequence._get_prefix_suffix(date=sequence_date, date_range=sequence_date)
+                number_next = sequence._get_current_sequence(sequence_date=sequence_date).number_next_actual
                 move.invoice_sequence_number_next_prefix = prefix
                 move.invoice_sequence_number_next = '%%0%sd' % sequence.padding % number_next
                 treated |= move
@@ -1153,7 +1154,8 @@ class AccountMove(models.Model):
             nxt = re.sub("[^0-9]", '', move.invoice_sequence_number_next)
             result = re.match("(0*)([0-9]+)", nxt)
             if result and sequence:
-                date_sequence = sequence._get_current_sequence(sequence_date=move.date)
+                sequence_date = move.date or move.invoice_date
+                date_sequence = sequence._get_current_sequence(sequence_date=sequence_date)
                 date_sequence.number_next_actual = int(result.group(2))
 
     def _compute_payments_widget_to_reconcile_info(self):