Merge #1172: [backport] gui: fix displayed feerate estimate

55325c9 gui: fix displayed feerate estimate (jp1ac4)

Pull request description:

  backport of #1171 to 6.x

ACKs for top commit:
  jp1ac4:
    ACK 55325c9.

Tree-SHA512: 122d4231aded98f00504d0a2c25ab58fd32619bc7d7c76d3c1702aeb4a1b4f6b17dd293403ed69c541e60475183cf028859ea0a91ad29ec11c825849e50f4bb7

gui/src/daemon/model.rs

@@ -64,7 +64,14 @@ impl SpendTx {
         secp: &secp256k1::Secp256k1<impl secp256k1::Verification>,
         network: Network,
     ) -> Self {
-        let max_vbytes = desc.unsigned_tx_max_vbytes(&psbt.unsigned_tx, false);
+        // Use primary path if no inputs are using a relative locktime.
+        let use_primary_path = !psbt
+            .unsigned_tx
+            .input
+            .iter()
+            .map(|txin| txin.sequence)
+            .any(|seq| seq.is_relative_lock_time());
+        let max_vbytes = desc.unsigned_tx_max_vbytes(&psbt.unsigned_tx, use_primary_path);
         let change_indexes: Vec<usize> = desc
             .change_indexes(&psbt, secp)
             .into_iter()