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Unflake "Guest user can set display names" #7327

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anoadragon453
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After my investigation, I found that setting the max cache entries for get_latest_event_ids_in_room to 0 unflaked this test, meaning that there was somewhere we weren't invalidating this cache when we should've been.

I couldn't find anywhere where we did so after a membership change, so I've added the appropriate line. I'd appreciate feedback on this as I don't have a complete understanding of the replication code.

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For reasons which I hope matrix-org/sytest#836 (comment) might explain, I think this is probably fixing the problem in the wrong place, and doing it this way will mean that there are other ways this bug can bite which won't get fixed.

It's certainly an interesting and valuable datapoint if this deflakes the test, though.

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Superseded by matrix-org/sytest#871

@clokep clokep deleted the anoa/unflake_guest_user_test branch May 15, 2020 18:12
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