[wallet] abort when attempting to fund a transaction above maxtxfee

FundTransaction calls GetMinimumFee which, when the fee rate is absurdly high, quietly reduced the fee to -maxtxfee. Becaue an absurdly high fee rate is usually the result of a fat finger, aborting seems safer behavior.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/util/error.h b/src/util/error.h
index d93309551b..0fd474b962 100644
--- a/src/util/error.h
+++ b/src/util/error.h
@@ -27,6 +27,7 @@ enum class TransactionError {
     INVALID_PSBT,
     PSBT_MISMATCH,
     SIGHASH_MISMATCH,
+    MAX_FEE_EXCEEDED,
 };
 
 std::string TransactionErrorString(const TransactionError error);