I don't understand what the "coins not used" comment meant here.
It was added in the change away from the old config.WALLET_BATCH_RBF option
(ab14c3e138).
The `coins` param *is used* in wallet.get_candidates_for_batching.
Without setting that, the returned set of candidates was restricted to
only base txs that had a large enough change output to cover *all* the newly added outputs.
Instead, it is desirable to allow adding new inputs.
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486 KiB