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9b7ec393b8
Instead of using the dummysigner to compute a placeholder satisfaction, infer a descriptor on the scriptPubKey of the coin being spent and use the estimation of the satisfaction size given by the descriptor directly. Note this (almost, see next paragraph) exactly conserves the previous behaviour. For instance CalculateMaximumSignedInputSize was previously assuming the input to be spent in a transaction that spends at least one Segwit coin, since it was always accounting for the serialization of the number of witness elements. In this commit we use a placeholder for the size of the serialization of the witness stack size (1 byte). Since the logic in this commit is already tricky enough to review, and that it is only a very tiny approximation not observable through the existing tests, it is addressed in the next commit.