AsyncIOEventEmitter should keep a reference to scheduled futures about pyee HOT 5 CLOSED

I think that assigning to fut and having callback close around it might be enough. I really don't want to get in the business of storing futures in a set and tests are consistently behaving so I'm going to hold off on anything more obvious, but if there ends up being a concrete bug I'm happy to take a closer look.

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When _emit_run finishes, fut is out of scope, so the future may be garbage-collected. This causes a bug in playwright that loses events, as the corresponding futures vanish before they're fully executed and the corresponding error message appears when the program finishes. A solution is to store the futures in a file-level variable, then use the callback to remove them once finished.

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Is there any further conclusion here?

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I'm currently pushing a fix in v9.1.1 - give it a shot, and if you still have issues let me know.

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For the record, we're still observing this issue with pyee==11.0.0 (see scrapy-plugins/scrapy-playwright#188 & scrapy-plugins/scrapy-playwright#233).
I'm mostly leaving this message to keep track of this, at the time I'm not able to provide a reproducible example using only pyee and I'm well aware that the issues I mentioned add two layers of dependencies 😞.

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