Block and wait until the UI element **disappears** within the given timeout.

        Args:
            timeout: maximum waiting time in seconds

        Raises:
            PocoTargetTimeout: when timeout

def wait_for_disappearance(self, timeout=120):
        """
        Block and wait until the UI element **disappears** within the given timeout.

        Args:
            timeout: maximum waiting time in seconds

        Raises:
            PocoTargetTimeout: when timeout
        """

        start = time.time()
        while self.exists():
            self.poco.sleep_for_polling_interval()
            if time.time() - start > timeout:
                raise PocoTargetTimeout('disappearance', self)