trame binding: run callback only if model changed

                @self.state.change(state_variable_name)

                def update_viewmodel_callback(**kwargs: dict) -> None:

                    success = True

                    updated = True

                    if self.viewmodel_linked_object and issubclass(type(self.viewmodel_linked_object), BaseModel):

                        json_str = json.dumps(kwargs[state_variable_name])

                        try:

                            model = self.viewmodel_linked_object.model_validate_json(json_str)

                            if model != self.viewmodel_linked_object:

                                for field, value in model:

                                    setattr(self.viewmodel_linked_object, field, value)

                            else:

                                updated = False

                        except Exception:

                            success = False

                            updated = False

                    elif isinstance(self.viewmodel_linked_object, dict):

                        self.viewmodel_linked_object.update(kwargs[state_variable_name])

                    elif is_callable(self.viewmodel_linked_object):

                        cast(Callable, self.viewmodel_linked_object)(kwargs[state_variable_name])

                    else:

                        raise Exception("cannot update", self.viewmodel_linked_object)

                    if self.viewmodel_callback_after_update and success:

                    if self.viewmodel_callback_after_update and updated:

                        self.viewmodel_callback_after_update(state_variable_name)

    def update_in_view(self, value: Any) -> None: