channeld: don't send multiple update_fee until previous settled. #3325
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Our feerate logic is overly simplistic (ha!) and we seem to get confused
on back-to-back feerate updates. Fixing it seems to require much more
complex feerate logic which I am deeply reluctant to implement, as it's
terribly fragile and will be discarded eventually once we have
simplified commitments.
Fixes: #2661
Signed-off-by: Rusty Russell [email protected]
Changelog-Fixed: Occasional 'Bad commit_sig signature' channel failures with fee updates (#2661)