[IMP] account: add delivery date on invoices for France

The new legislation in France imposes to add te deliver date on the invoice.

task-5231287

Author: jedel-odoo

addons/l10n_fr_account/models/account_move.py

@@ -28,3 +28,11 @@ def _compute_show_delivery_date(self):
         for move in self:
             if move.l10n_fr_is_company_french:
                 move.show_delivery_date = move.is_sale_document()
+
+    def _post(self, soft=True):
+        # EXTEND 'account'
+        to_post = super()._post(soft)
+        for move in self:
+            if move.show_delivery_date and not move.delivery_date:
+                move.delivery_date = move.invoice_date or fields.Date.context_today(self)
+        return to_post