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Fixes: #382
This is related to an issue caused by #377.
Before the change in #377,
_get_free_channel_id
was modifying the array of available channels. After the change, the array was no longer being modified to track the newly used channel. This caused the issue in #382 where it attempts to open the channel twice.This PR fixes the issue by appending to the array of currently used channels when
_get_free_channel_id
is used.