add create cpfp transaction functionality

src/main/java/com/sparrowwallet/sparrow/control/EntryCell.java

@@ -92,6 +92,17 @@ public class EntryCell extends TreeTableCell<Entry, Entry> {
                     actionBox.getChildren().add(increaseFeeButton);
                 }
 
+                if(blockTransaction.getHeight() <= 0 && containsWalletOutputs(transactionEntry)) {
+                    Button cpfpButton = new Button("");
+                    Glyph cpfpGlyph = new Glyph(FontAwesome5.FONT_NAME, FontAwesome5.Glyph.SIGN_OUT_ALT);
+                    cpfpGlyph.setFontSize(12);
+                    cpfpButton.setGraphic(cpfpGlyph);
+                    cpfpButton.setOnAction(event -> {
+                        createCpfp(transactionEntry);
+                    });
+                    actionBox.getChildren().add(cpfpButton);
+                }
+
                 setGraphic(actionBox);
             } else if(entry instanceof NodeEntry) {
                 NodeEntry nodeEntry = (NodeEntry)entry;
@@ -245,6 +256,37 @@ public class EntryCell extends TreeTableCell<Entry, Entry> {
         return AppServices.getTargetBlockFeeRates().values().iterator().next();
     }
 
+    private static void createCpfp(TransactionEntry transactionEntry) {
+        BlockTransaction blockTransaction = transactionEntry.getBlockTransaction();
+        List<BlockTransactionHashIndex> ourOutputs = transactionEntry.getChildren().stream()
+                .filter(e -> e instanceof HashIndexEntry)
+                .map(e -> (HashIndexEntry)e)
+                .filter(e -> e.getType().equals(HashIndexEntry.Type.OUTPUT))
+                .map(HashIndexEntry::getHashIndex)
+                .collect(Collectors.toList());
+
+        if(ourOutputs.isEmpty()) {
+            throw new IllegalStateException("Cannot create CPFP without any wallet outputs to spend");
+        }
+
+        BlockTransactionHashIndex utxo = ourOutputs.get(0);
+
+        WalletNode freshNode = transactionEntry.getWallet().getFreshNode(KeyPurpose.RECEIVE);
+        String label = transactionEntry.getLabel() == null ? "" : transactionEntry.getLabel();
+        label += (label.isEmpty() ? "" : " ") + "(CPFP)";
+        Payment payment = new Payment(transactionEntry.getWallet().getAddress(freshNode), label, utxo.getValue(), true);
+
+        EventManager.get().post(new SendActionEvent(transactionEntry.getWallet(), List.of(utxo)));
+        Platform.runLater(() -> EventManager.get().post(new SpendUtxoEvent(transactionEntry.getWallet(), List.of(utxo), List.of(payment), blockTransaction.getFee(), false)));
+    }
+
+    private static boolean containsWalletOutputs(TransactionEntry transactionEntry) {
+        return transactionEntry.getChildren().stream()
+                .filter(e -> e instanceof HashIndexEntry)
+                .map(e -> (HashIndexEntry)e)
+                .anyMatch(e -> e.getType().equals(HashIndexEntry.Type.OUTPUT));
+    }
+
     private static void sendSelectedUtxos(TreeTableView<Entry> treeTableView, HashIndexEntry hashIndexEntry) {
         List<HashIndexEntry> utxoEntries = treeTableView.getSelectionModel().getSelectedCells().stream()
                 .map(tp -> tp.getTreeItem().getValue())
@@ -286,7 +328,7 @@ public class EntryCell extends TreeTableCell<Entry, Entry> {
             getItems().add(copyTxid);
 
             if(blockTransaction.getTransaction().isReplaceByFee() && transactionEntry.getWallet().allInputsFromWallet(blockTransaction.getHash())) {
-                MenuItem increaseFee = new MenuItem("Increase Fee");
+                MenuItem increaseFee = new MenuItem("Increase Fee (RBF)");
                 increaseFee.setOnAction(AE -> {
                     hide();
                     increaseFee(transactionEntry);
@@ -294,6 +336,16 @@ public class EntryCell extends TreeTableCell<Entry, Entry> {
 
                 getItems().add(increaseFee);
             }
+
+            if(containsWalletOutputs(transactionEntry)) {
+                MenuItem createCpfp = new MenuItem("Increase Effective Fee (CPFP)");
+                createCpfp.setOnAction(AE -> {
+                    hide();
+                    createCpfp(transactionEntry);
+                });
+
+                getItems().add(createCpfp);
+            }
         }
     }
 

src/main/java/com/sparrowwallet/sparrow/glyphfont/FontAwesome5.java

@@ -48,12 +48,14 @@ public class FontAwesome5 extends GlyphFont {
         SATELLITE_DISH('\uf7c0'),
         SD_CARD('\uf7c2'),
         SEARCH('\uf002'),
+        SIGN_OUT_ALT('\uf2f5'),
         SQUARE('\uf0c8'),
         TIMES_CIRCLE('\uf057'),
         TOGGLE_OFF('\uf204'),
         TOGGLE_ON('\uf205'),
         TOOLS('\uf7d9'),
         UNDO('\uf0e2'),
+        USER_FRIENDS('\uf500'),
         WALLET('\uf555');
 
         private final char ch;

src/main/java/com/sparrowwallet/sparrow/wallet/SendController.java

@@ -81,6 +81,9 @@ public class SendController extends WalletFormController implements Initializabl
     @FXML
     private CopyableLabel feeRate;
 
+    @FXML
+    private Label cpfpFeeRate;
+
     @FXML
     private Label feeRatePriority;
 
@@ -281,6 +284,8 @@ public class SendController extends WalletFormController implements Initializabl
 
         FeeRatesSelection feeRatesSelection = Config.get().getFeeRatesSelection();
         feeRatesSelection = (feeRatesSelection == null ? FeeRatesSelection.MEMPOOL_SIZE : feeRatesSelection);
+        cpfpFeeRate.managedProperty().bind(cpfpFeeRate.visibleProperty());
+        cpfpFeeRate.setVisible(false);
         setDefaultFeeRate();
         updateFeeRateSelection(feeRatesSelection);
         feeSelectionToggleGroup.selectToggle(feeRatesSelection == FeeRatesSelection.BLOCK_TARGET ? targetBlocksToggle : mempoolSizeToggle);
@@ -346,6 +351,7 @@ public class SendController extends WalletFormController implements Initializabl
                 }
 
                 setFeeRate(feeRate);
+                setEffectiveFeeRate(walletTransaction);
             }
 
             transactionDiagram.update(walletTransaction);
@@ -354,7 +360,7 @@ public class SendController extends WalletFormController implements Initializabl
 
         transactionDiagram.sceneProperty().addListener((observable, oldScene, newScene) -> {
             if(oldScene == null && newScene != null) {
-                transactionDiagram.update(null);
+                transactionDiagram.update(walletTransactionProperty.get());
                 newScene.getWindow().heightProperty().addListener((observable1, oldValue, newValue) -> {
                     transactionDiagram.update(walletTransactionProperty.get());
                 });
@@ -636,10 +642,28 @@ public class SendController extends WalletFormController implements Initializabl
     }
 
     private void setFeeRate(Double feeRateAmt) {
-        feeRate.setText(String.format("%.2f", feeRateAmt) + " sats/vByte");
+        feeRate.setText(String.format("%.2f", feeRateAmt) + " sats/vB");
         setFeeRatePriority(feeRateAmt);
     }
 
+    private void setEffectiveFeeRate(WalletTransaction walletTransaction) {
+        List<BlockTransaction> unconfirmedUtxoTxs = walletTransaction.getSelectedUtxos().keySet().stream().filter(ref -> ref.getHeight() <= 0)
+                .map(ref -> getWalletForm().getWallet().getTransactions().get(ref.getHash())).filter(Objects::nonNull).distinct().collect(Collectors.toList());
+        if(!unconfirmedUtxoTxs.isEmpty()) {
+            cpfpFeeRate.setVisible(true);
+            long utxoTxFee = unconfirmedUtxoTxs.stream().mapToLong(BlockTransaction::getFee).sum();
+            double utxoTxSize = unconfirmedUtxoTxs.stream().mapToDouble(blkTx -> blkTx.getTransaction().getVirtualSize()).sum();
+            long thisFee = walletTransaction.getFee();
+            double thisSize = walletTransaction.getTransaction().getVirtualSize();
+            double effectiveRate = (utxoTxFee + thisFee) / (utxoTxSize + thisSize);
+            Tooltip tooltip = new Tooltip(String.format("%.2f", effectiveRate) + " sats/vB effective rate");
+            cpfpFeeRate.setTooltip(tooltip);
+            cpfpFeeRate.setVisible(true);
+        } else {
+            cpfpFeeRate.setVisible(false);
+        }
+    }
+
     private void setFeeRatePriority(Double feeRateAmt) {
         Map<Integer, Double> targetBlocksFeeRates = getTargetBlocksFeeRates();
         Integer targetBlocks = getTargetBlocks(feeRateAmt);
@@ -961,7 +985,7 @@ public class SendController extends WalletFormController implements Initializabl
             List<BlockTransactionHashIndex> utxos = event.getUtxos();
             utxoSelectorProperty.set(new PresetUtxoSelector(utxos));
             utxoFilterProperty.set(null);
-            updateTransaction(event.getPayments() == null);
+            updateTransaction(event.getPayments() == null || event.getPayments().stream().anyMatch(Payment::isSendMax));
         }
     }
 

src/main/resources/com/sparrowwallet/sparrow/wallet/send.fxml

@@ -90,6 +90,14 @@
                         </Field>
                         <Field fx:id="feeRateField" text="Rate:">
                             <CopyableLabel fx:id="feeRate" />
+                            <Label fx:id="cpfpFeeRate" text="CPFP">
+                                <graphic>
+                                    <Glyph fontFamily="Font Awesome 5 Free Solid" fontSize="12" icon="SIGN_OUT_ALT" />
+                                </graphic>
+                                <padding>
+                                    <Insets left="10"/>
+                                </padding>
+                            </Label>
                             <Region HBox.hgrow="ALWAYS" />
                             <Label fx:id="feeRatePriority" graphicTextGap="5" contentDisplay="RIGHT">
                                 <graphic>