def METHOD_NAME(self, sender):
    """ Signal callback, executed when the user edits the path.
    Disables the backend. The user will re-enable it to confirm the changes
    (s)he made.
    @param sender: not used, only here for signal compatibility
    """
    if self.backend.is_enabled() and not self.backend.is_default():
        self.req.set_backend_enabled(self.backend.get_id(), False)