Fix that CWallet::AbandonTransaction would only traverse one level

Prior to this change, it would mark only the first layer of
child transactions abandoned, due to always following the input hashTx
rather than the current now tx.

Author: Empact

src/wallet/wallet.cpp

@@ -1146,7 +1146,7 @@ bool CWallet::AbandonTransaction(const uint256& hashTx)
             batch.WriteTx(wtx);
             NotifyTransactionChanged(this, wtx.GetHash(), CT_UPDATED);
             // Iterate over all its outputs, and mark transactions in the wallet that spend them abandoned too
-            TxSpends::const_iterator iter = mapTxSpends.lower_bound(COutPoint(hashTx, 0));
+            TxSpends::const_iterator iter = mapTxSpends.lower_bound(COutPoint(now, 0));
             while (iter != mapTxSpends.end() && iter->first.hash == now) {
                 if (!done.count(iter->second)) {
                     todo.insert(iter->second);

test/functional/wallet_abandonconflict.py

@@ -70,9 +70,17 @@ def run_test(self):
         signed2 = self.nodes[0].signrawtransactionwithwallet(self.nodes[0].createrawtransaction(inputs, outputs))
         txABC2 = self.nodes[0].sendrawtransaction(signed2["hex"])
 
+        # Create a child tx spending ABC2
+        signed3_change = Decimal("24.999")
+        inputs = [ {"txid":txABC2, "vout":0} ]
+        outputs = { self.nodes[0].getnewaddress(): signed3_change }
+        signed3 = self.nodes[0].signrawtransactionwithwallet(self.nodes[0].createrawtransaction(inputs, outputs))
+        # note tx is never directly referenced, only abandoned as a child of the above
+        self.nodes[0].sendrawtransaction(signed3["hex"])
+
         # In mempool txs from self should increase balance from change
         newbalance = self.nodes[0].getbalance()
-        assert_equal(newbalance, balance - Decimal("30") + Decimal("24.9996"))
+        assert_equal(newbalance, balance - Decimal("30") + signed3_change)
         balance = newbalance
 
         # Restart the node with a higher min relay fee so the parent tx is no longer in mempool
@@ -87,7 +95,7 @@ def run_test(self):
         # Not in mempool txs from self should only reduce balance
         # inputs are still spent, but change not received
         newbalance = self.nodes[0].getbalance()
-        assert_equal(newbalance, balance - Decimal("24.9996"))
+        assert_equal(newbalance, balance - signed3_change)
         # Unconfirmed received funds that are not in mempool, also shouldn't show
         # up in unconfirmed balance
         unconfbalance = self.nodes[0].getunconfirmedbalance() + self.nodes[0].getbalance()