Change bumpfee to use watch-only funds for legacy watchonly wallets

src/wallet/feebumper.cpp

@@ -47,7 +47,8 @@ static feebumper::Result PreconditionChecks(const CWallet& wallet, const CWallet
 
     // check that original tx consists entirely of our inputs
     // if not, we can't bump the fee, because the wallet has no way of knowing the value of the other inputs (thus the fee)
-    if (!wallet.IsAllFromMe(*wtx.tx, ISMINE_SPENDABLE)) {
+    isminefilter filter = wallet.GetLegacyScriptPubKeyMan() && wallet.IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS) ? ISMINE_WATCH_ONLY : ISMINE_SPENDABLE;
+    if (!wallet.IsAllFromMe(*wtx.tx, filter)) {
         errors.push_back("Transaction contains inputs that don't belong to this wallet");
         return feebumper::Result::WALLET_ERROR;
     }
@@ -78,7 +79,8 @@ static feebumper::Result CheckFeeRate(const CWallet& wallet, const CWalletTx& wt
     CFeeRate incrementalRelayFee = std::max(wallet.chain().relayIncrementalFee(), CFeeRate(WALLET_INCREMENTAL_RELAY_FEE));
 
     // Given old total fee and transaction size, calculate the old feeRate
-    CAmount old_fee = wtx.GetDebit(ISMINE_SPENDABLE) - wtx.tx->GetValueOut();
+    isminefilter filter = wallet.GetLegacyScriptPubKeyMan() && wallet.IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS) ? ISMINE_WATCH_ONLY : ISMINE_SPENDABLE;
+    CAmount old_fee = wtx.GetDebit(filter) - wtx.tx->GetValueOut();
     const int64_t txSize = GetVirtualTransactionSize(*(wtx.tx));
     CFeeRate nOldFeeRate(old_fee, txSize);
     // Min total fee is old fee + relay fee
@@ -195,7 +197,8 @@ Result CreateTotalBumpTransaction(const CWallet* wallet, const uint256& txid, co
     }
 
     // calculate the old fee and fee-rate
-    old_fee = wtx.GetDebit(ISMINE_SPENDABLE) - wtx.tx->GetValueOut();
+    isminefilter filter = wallet->GetLegacyScriptPubKeyMan() && wallet->IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS) ? ISMINE_WATCH_ONLY : ISMINE_SPENDABLE;
+    old_fee = wtx.GetDebit(filter) - wtx.tx->GetValueOut();
     CFeeRate nOldFeeRate(old_fee, txSize);
     // The wallet uses a conservative WALLET_INCREMENTAL_RELAY_FEE value to
     // future proof against changes to network wide policy for incremental relay
@@ -308,7 +311,8 @@ Result CreateRateBumpTransaction(CWallet& wallet, const uint256& txid, const CCo
         }
     }
 
-    old_fee = wtx.GetDebit(ISMINE_SPENDABLE) - wtx.tx->GetValueOut();
+    isminefilter filter = wallet.GetLegacyScriptPubKeyMan() && wallet.IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS) ? ISMINE_WATCH_ONLY : ISMINE_SPENDABLE;
+    old_fee = wtx.GetDebit(filter) - wtx.tx->GetValueOut();
 
     if (coin_control.m_feerate) {
         // The user provided a feeRate argument.

src/wallet/rpcwallet.cpp

@@ -3380,10 +3380,12 @@ static UniValue bumpfee(const JSONRPCRequest& request)
     RPCTypeCheck(request.params, {UniValue::VSTR, UniValue::VOBJ});
     uint256 hash(ParseHashV(request.params[0], "txid"));
 
+    CCoinControl coin_control;
+    coin_control.fAllowWatchOnly = pwallet->IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS);
     // optional parameters
     CAmount totalFee = 0;
-    CCoinControl coin_control;
     coin_control.m_signal_bip125_rbf = true;
+
     if (!request.params[1].isNull()) {
         UniValue options = request.params[1];
         RPCTypeCheckObj(options,