gen: Support duplicate futures in WaitIterator - #3691
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WaitIterator keyed each unfinished entry by Future, so repeated inputs were collapsed and the second completion raised KeyError. Store all indices for each Future and consume them in input order. Add positional and keyword regression coverage. Fixes tornadoweb#2029
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WaitIteratorstored unfinished inputs in a dict keyed by future, so passing the same future more than once collapsed its indices and the second completion raisedKeyError. Keep a deque of indices for each future instead, preserving positional and keyword entries in input order.Adds regression coverage for both constructor forms. Fixes #2029.