Trigger notification when field is changed by on_change
We may have fields that are updated by on_change
calls for which we want to base the notification.
Those fields should be checked with the changed fields.
For example to implement #13750 which is based on the contact mechanism value
, the value
field is not always directly modified by the user but widget dedicated Function
fields are. So without this behavior, we need to declare all the Function
fields as depends of the on_change_notify
which is not very modular.