[FIX] core: avoid duplicate onchanges

When performing the onchange for the first time on a new record, if a
field has a default value, it could be two times in the `todo` field
list to compute.

closes odoo/odoo#63983

Signed-off-by: Raphael Collet (rco) <rco@openerp.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/odoo/addons/test_new_api/tests/test_onchange.py b/odoo/addons/test_new_api/tests/test_onchange.py
index a56348cf050..b5cd861edb8 100644
--- a/odoo/addons/test_new_api/tests/test_onchange.py
+++ b/odoo/addons/test_new_api/tests/test_onchange.py
@@ -742,6 +742,14 @@ class TestComputeOnchange(common.TransactionCase):
         self.assertEqual(form.bar, "foo6r")
         self.assertEqual(form.baz, "baz5")
 
+    def test_onchange_once(self):
+        """ Modifies `foo` field which will trigger an onchange method and
+        checks it was triggered only one time. """
+        form = Form(self.env['test_new_api.compute.onchange'].with_context(default_foo="oof"))
+        record = form.save()
+        self.assertEqual(record.foo, "oof")
+        self.assertEqual(record.count, 1, "value onchange must be called only one time")
+
     def test_onchange_one2many(self):
         record = self.env['test_new_api.model_parent_m2o'].create({
             'name': 'Family',