@staticmethod
def is_fold_trigger(block):
    """
        Checks if the block is a fold trigger.

        :param block: block to check
        :return: True if the block is a fold trigger (represented as a node in
            the fold panel)
        """
    if block is None:
        return False
    state = block.userState()
    if state == -1:
        state = 0
    return bool(state & 67108864)
