Fix crash sending window increment after close #95
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Motivation:
When reads have yet to be delivered to a channel and we receive a
CHANNEL_CLOSE message, we forcibly deliver all of the reads. As part of
doing this, we process the window size changes and potentially send
window increment messages. These messages are invalid to send at this
time, and the state machine rightly forbids us from sending them, which
causes a crash.
Modifications:
still open.
Result:
No crashing after channel close.