Fix poll(Duration::ZERO) with use-dev-tty
#840
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This PR fixes the incorrect behaviour of
crossterm::event::poll(Duration::ZERO)whenuse-dev-ttyis used.Previously, events that were already buffered were only checked if some amount of time was left before the timeout, which is never the case when
Duration::ZEROis used, which did lead to events being buffered but unreported.Now, we always check buffered events at least once, regardless of timeout.
Fixes #839.