[FIX] base(_address_extended): correctly fix cache miss bug when creating company

Without this flush, partner computed fields are not computed when creating
the company, leading to a cache miss. It is due to the quite complex model
introduced in base_address_extended with multiple related / computed / inverse
fields.

How to reproduce
  * have base_address_extended installed;
  * create a company with address bits (street_name, street_number,
    street_number2);
  * encounter a nice cache miss bug (partner<ID>.street_number):

Original task ID 2068145
PR odoo/odoo#42701

closes odoo/odoo#42722

X-original-commit: 69ea928828fca06c9b0f589e23ca3c0d4c387ab0
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>
Co-authored-by: Thibault Delavallée <tde@odoo.com>
Co-authored-by: Aurélien Warnon <awa@odoo.com>

odoo/addons/base/models/res_company.py

@@ -224,6 +224,8 @@ class Company(models.Model):
             'website': vals.get('website'),
             'vat': vals.get('vat'),
         })
+        # compute stored fields, for example address dependent fields
+        partner.flush()
         vals['partner_id'] = partner.id
         self.clear_caches()
         company = super(Company, self).create(vals)