minor changes to support adding additional rbf tx inputs

src/main/java/com/sparrowwallet/drongo/wallet/InsufficientFundsException.java

@@ -1,6 +1,8 @@
 package com.sparrowwallet.drongo.wallet;
 
 public class InsufficientFundsException extends Exception {
+    private Long targetValue;
+
     public InsufficientFundsException() {
         super();
     }
@@ -8,4 +10,13 @@ public class InsufficientFundsException extends Exception {
     public InsufficientFundsException(String msg) {
         super(msg);
     }
+
+    public InsufficientFundsException(String message, Long targetValue) {
+        super(message);
+        this.targetValue = targetValue;
+    }
+
+    public Long getTargetValue() {
+        return targetValue;
+    }
 }

src/main/java/com/sparrowwallet/drongo/wallet/PresetUtxoSelector.java

@@ -7,15 +7,22 @@ import java.util.stream.Collectors;
 
 public class PresetUtxoSelector extends SingleSetUtxoSelector {
     private final Collection<BlockTransactionHashIndex> presetUtxos;
+    private final Collection<BlockTransactionHashIndex> excludedUtxos;
     private final boolean maintainOrder;
 
     public PresetUtxoSelector(Collection<BlockTransactionHashIndex> presetUtxos) {
+        this(presetUtxos, new ArrayList<>());
+    }
+
+    public PresetUtxoSelector(Collection<BlockTransactionHashIndex> presetUtxos, Collection<BlockTransactionHashIndex> excludedUtxos) {
         this.presetUtxos = presetUtxos;
+        this.excludedUtxos = excludedUtxos;
         this.maintainOrder = false;
     }
 
     public PresetUtxoSelector(Collection<BlockTransactionHashIndex> presetUtxos, boolean maintainOrder) {
         this.presetUtxos = presetUtxos;
+        this.excludedUtxos = new ArrayList<>();
         this.maintainOrder = maintainOrder;
     }
 
@@ -44,6 +51,10 @@ public class PresetUtxoSelector extends SingleSetUtxoSelector {
         return presetUtxos;
     }
 
+    public Collection<BlockTransactionHashIndex> getExcludedUtxos() {
+        return excludedUtxos;
+    }
+
     @Override
     public boolean shuffleInputs() {
         return !maintainOrder;

src/main/java/com/sparrowwallet/drongo/wallet/Wallet.java

@@ -1224,7 +1224,7 @@ public class Wallet extends Persistable implements Comparable<Wallet> {
             }
         }
 
-        throw new InsufficientFundsException("Not enough combined value in UTXOs for output value " + targetValue);
+        throw new InsufficientFundsException("Not enough combined value in UTXOs for output value " + targetValue, targetValue);
     }
 
     private List<OutputGroup> getGroupedUtxos(List<UtxoFilter> utxoFilters, double feeRate, double longTermFeeRate, boolean groupByAddress, boolean includeSpentMempoolOutputs) {