def makeFootnoteId(self, id):
        if self.getConfig("UNIQUE_IDS"):
            return 'fn:%d-%s' % (self.unique_prefix, id)
        else:
            return 'fn:%s' % id
Ensures there is an event loop thread running. Should be called
dataset/ETHPy150Open darcyliu/storyboard/markdown/extensions/footnotes.py/FootnoteExtension.makeFootnoteId--crossover with--dataset/ETHPy150Open ReactiveX/RxPY/rx/concurrency/eventloopscheduler.py/EventLoopScheduler.ensure_thread