[IMP] base: allow to use default_ context key for properties

Purpose
=======
Allow to use `default_properties.xxxxx` as a context key, to set the
default value on a property. We need that because when we group by
a property in a Kanban view, we can create new record in a given
column, and this process will set this context key.

Task-3032464

Part-of: odoo/odoo#103510

odoo/addons/test_new_api/tests/test_properties.py

@@ -604,6 +604,41 @@ class PropertiesCase(TestPropertiesMixin):
         })
         self.assertEqual(self._get_sql_properties(record), {'my_char': 'my char', 'test': self.partner_2.id})
 
+        # use the context to set the default value, the default key in the definition is ignored
+        # (e.g. when you create a new record in a Kanban view grouped by a property)
+        del property_definition[0]['value']
+        self.discussion_1.attributes_definition = property_definition
+        partner = self.env['test_new_api.partner'].create({'name': 'Test Default'})
+        message = self.env['test_new_api.message'] \
+            .with_context({'default_attributes.my_many2one': partner.id}) \
+            .create({
+                'name': 'Test Message',
+                'author': self.user.id,
+                'discussion': self.discussion_1.id,
+                'attributes': property_definition,
+            })
+
+        sql_values = self._get_sql_properties(message)
+        self.assertEqual(sql_values, {'my_many2one': partner.id})
+        properties = message.read(['attributes'])[0]['attributes']
+        self.assertEqual(properties[0]['value'], (partner.id, partner.display_name))
+
+        # "None" is a valid default value
+        del property_definition[0]['value']
+        message = self.env['test_new_api.message'] \
+            .with_context({'default_attributes.my_many2one': None}) \
+            .create({
+                'name': 'Test Message',
+                'author': self.user.id,
+                'discussion': self.discussion_1.id,
+                'attributes': property_definition,
+            })
+
+        sql_values = self._get_sql_properties(message)
+        self.assertEqual(sql_values, {'my_many2one': False})
+        properties = message.read(['attributes'])[0]['attributes']
+        self.assertEqual(properties[0]['value'], False)
+
     def test_properties_field_read(self):
         """Test the behavior of the read method.
 

odoo/fields.py

@@ -3545,7 +3545,12 @@ class Properties(Field):
 
         for properties_value in properties_list_values:
             if properties_value.get('value') is None:
-                default = properties_value.get('default') or False
+                property_name = properties_value.get('name')
+                context_key = f"default_{self.name}.{property_name}"
+                if property_name and context_key in env.context:
+                    default = env.context[context_key]
+                else:
+                    default = properties_value.get('default') or False
                 properties_value['value'] = default
 
         return properties_list_values