Copy payment mode and mandate from invoice to refund

Run dos2unix on the few files that had DOS carriage return

account_banking_mandate/__init__.py

@@ -1,5 +1,3 @@
 # -*- coding: utf-8 -*-
-# © 2014 Compassion CH - Cyril Sester <csester@compassion.ch>
-# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 
 from . import models

account_banking_mandate/models/account_invoice.py

@@ -25,3 +25,18 @@ class AccountInvoice(models.Model):
             if invoice.type in ('out_invoice', 'out_refund'):
                 res['mandate_id'] = invoice.mandate_id.id or False
         return res
+
+    # If a customer pays via direct debit, it's refunds should
+    # be deducted form the next debit by default. The module
+    # account_payment_partner copies payment_mode_id from invoice
+    # to refund, and we also need to copy mandate from invoice to refund
+    @api.model
+    def _prepare_refund(
+            self, invoice, date_invoice=None, date=None, description=None,
+            journal_id=None):
+        vals = super(AccountInvoice, self)._prepare_refund(
+            invoice, date_invoice=date_invoice, date=date,
+            description=description, journal_id=journal_id)
+        if invoice.type == 'out_invoice':
+            vals['mandate_id'] = invoice.mandate_id.id
+        return vals

account_banking_mandate/views/account_invoice_view.xml

@@ -13,7 +13,8 @@
     <field name="inherit_id" ref="account_payment_partner.invoice_form"/>
     <field name="arch" type="xml">
         <field name="partner_bank_id" position="after">
-            <field name="mandate_id" domain="[('partner_id', '=', commercial_partner_id), ('state', '=', 'valid')]" attrs="{'invisible': [('type', '=', 'out_refund')]}"/>
+            <field name="mandate_id"
+                domain="[('partner_id', '=', commercial_partner_id), ('state', '=', 'valid')]"/>
         </field>
     </field>
 </record>