Don't fail send_all retaining reserves for 0 channels
#540
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Previouly, `OnchainPayment::send_all_to_address` would fail in the `retain_reserves` mode if the maintained reserves were below the dust limit. Most notably this would happen if we had no channels open at all. Here, we fix this by simply falling back to the draining case (not considering reserves) if the anchor reserves are below dust. We also add a unit test that would have caught this regression in the first place.
.. as this is useful information.
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We create temporary transactions for fee estimation purposes. Doing this might advance the descriptor state though. So here we call `cancel_tx` to tell the wallet we no longer intend to broadcast the temporary transactions.
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Fixes #539.
Previouly,
OnchainPayment::send_all_to_addresswould fail in theretain_reservesmode if the maintained reserves were below the dustlimit. Most notably this would happen if we had no channels open at all.
Here, we fix this by simply falling back to the draining case (not
considering reserves) if the anchor reserves are below dust. We also add
a unit test that would have caught this regression in the first place.
Note: Github diff really messes up the first commit which is mostly adding an
ifand re-indenting the previous codeblock. It's best reviewed withgit show --color-moved --ignore-all-space