CoinControl: add option for custom confirmation target

Author: jonasschnelli

src/wallet/coincontrol.h

@@ -22,6 +22,8 @@ class CCoinControl
     bool fOverrideFeeRate;
     //! Feerate to use if overrideFeeRate is true
     CFeeRate nFeeRate;
+    //! Override the default confirmation target, 0 = use default
+    int nConfirmTarget;
 
     CCoinControl()
     {
@@ -37,6 +39,7 @@ class CCoinControl
         nMinimumTotalFee = 0;
         nFeeRate = CFeeRate(0);
         fOverrideFeeRate = false;
+        nConfirmTarget = 0;
     }
 
     bool HasSelected() const

src/wallet/wallet.cpp

@@ -2433,17 +2433,22 @@ bool CWallet::CreateTransaction(const vector<CRecipient>& vecSend, CWalletTx& wt
 
                 dPriority = wtxNew.ComputePriority(dPriority, nBytes);
 
+                // Allow to override the default confirmation target over the CoinControl instance
+                int currentConfirmationTarget = nTxConfirmTarget;
+                if (coinControl && coinControl->nConfirmTarget > 0)
+                    currentConfirmationTarget = coinControl->nConfirmTarget;
+
                 // Can we complete this as a free transaction?
                 if (fSendFreeTransactions && nBytes <= MAX_FREE_TRANSACTION_CREATE_SIZE)
                 {
                     // Not enough fee: enough priority?
-                    double dPriorityNeeded = mempool.estimateSmartPriority(nTxConfirmTarget);
+                    double dPriorityNeeded = mempool.estimateSmartPriority(currentConfirmationTarget);
                     // Require at least hard-coded AllowFree.
                     if (dPriority >= dPriorityNeeded && AllowFree(dPriority))
                         break;
                 }
 
-                CAmount nFeeNeeded = GetMinimumFee(nBytes, nTxConfirmTarget, mempool);
+                CAmount nFeeNeeded = GetMinimumFee(nBytes, currentConfirmationTarget, mempool);
                 if (coinControl && nFeeNeeded > 0 && coinControl->nMinimumTotalFee > nFeeNeeded) {
                     nFeeNeeded = coinControl->nMinimumTotalFee;
                 }