[REF] account: Sum rank for merge partner

* Sum rank fields if the partner is merged

It will help to increase the rank of both records and have a better ranking

closes odoo/odoo#141690

X-original-commit: afb5c915c5bc566628ed5283a6e434e123caaaf1
Signed-off-by: William André (wan) <wan@odoo.com>
Co-authored-by: Moisés Lopéz <moylop260@vauxoo.com>

addons/account/wizard/__init__.py

@@ -12,3 +12,4 @@ from . import base_document_layout
 from . import account_payment_register
 from . import account_tour_upload_bill
 from . import accrued_orders
+from . import base_partner_merge

addons/account/wizard/base_partner_merge.py

@@ -0,0 +1,11 @@
+from odoo import models
+
+
+class MergePartnerAutomatic(models.TransientModel):
+    _inherit = 'base.partner.merge.automatic.wizard'
+
+    def _get_summable_fields(self):
+        """Add to summable fields list, fields created in this module.
+         - customer_rank and supplier_rank will have a better ranking for the merged partner
+        """
+        return super()._get_summable_fields() + ['customer_rank', 'supplier_rank']