[FIX] account_group: Remove parent_order

This scrambles the proper order of the groups according the prefix.

account_group/__manifest__.py

@@ -4,7 +4,7 @@
 {
     "name": "Groups for accounts",
     "summary": "Use v11 account groups feature",
-    "version": "10.0.1.0.0",
+    "version": "10.0.1.1.0",
     "category": "Accounting",
     "website": "https://github.com/OCA/account-financial-tools",
     "author": "Tecnativa,"

account_group/migrations/10.0.1.1.0/post-migration.py

@@ -0,0 +1,11 @@
+# coding: utf-8
+# Copyright 2019 Tecnativa - Pedro M. Baeza
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+from openupgradelib import openupgrade
+
+
+@openupgrade.migrate()
+def migrate(env, version):
+    """Recompute parent store according new criteria."""
+    env['account.group']._parent_store_compute()

account_group/models/account_group.py

@@ -9,7 +9,6 @@ from odoo.osv import expression
 class AccountGroup(models.Model):
     _name = 'account.group'
     _parent_store = True
-    _parent_order = 'name'
     _order = 'code_prefix'
 
     parent_id = fields.Many2one(