[IMP] l10n_fr_account: Delivery Date in Invoice Header

There is a New legislation in France to add delivery date on invoice

 `delivery_date` appears in the header of customer invoice and in the invoice layout.

task-4908888

Author: abmn-odoo

addons/l10n_fr_account/models/account_move.py

@@ -19,3 +19,16 @@ def _get_view(self, view_id=None, view_type='form', **options):
     def _compute_l10n_fr_is_company_french(self):
         for record in self:
             record.l10n_fr_is_company_french = record.country_code in record.company_id._get_france_country_codes()
+
+    @api.depends('delivery_date')
+    def _compute_show_delivery_date(self):
+        for move in self:
+            move.show_delivery_date = True
+
+    @api.depends('invoice_date')
+    def _compute_delivery_date(self):
+        # EXTENDS 'account'
+        super()._compute_delivery_date()
+        for move in self:
+            if not move.delivery_date:
+                move.delivery_date = move.invoice_date