suggest opening the send to many dialog when adding multiple payments on the send tab

src/main/java/com/sparrowwallet/sparrow/AppController.java

@@ -1422,6 +1422,10 @@ public class AppController implements Initializable {
     }
 
     public void sendToMany(ActionEvent event) {
+        sendToMany(Collections.emptyList());
+    }
+
+    private void sendToMany(List<Payment> initialPayments) {
         if(sendToManyDialog != null) {
             Stage stage = (Stage)sendToManyDialog.getDialogPane().getScene().getWindow();
             stage.setAlwaysOnTop(true);
@@ -1437,7 +1441,7 @@ public class AppController implements Initializable {
                 bitcoinUnit = wallet.getAutoUnit();
             }
 
-            sendToManyDialog = new SendToManyDialog(bitcoinUnit);
+            sendToManyDialog = new SendToManyDialog(bitcoinUnit, initialPayments);
             sendToManyDialog.initModality(Modality.NONE);
             Optional<List<Payment>> optPayments = sendToManyDialog.showAndWait();
             sendToManyDialog = null;
@@ -3107,6 +3111,11 @@ public class AppController implements Initializable {
         }
     }
 
+    @Subscribe
+    public void requestSendToMany(RequestSendToManyEvent event) {
+        sendToMany(event.getPayments());
+    }
+
     @Subscribe
     public void functionAction(FunctionActionEvent event) {
         selectTab(event.getWallet());

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

@@ -13,8 +13,6 @@ import javafx.collections.FXCollections;
 import javafx.collections.ObservableList;
 import javafx.scene.Node;
 import javafx.scene.control.*;
-import javafx.scene.image.Image;
-import javafx.scene.image.ImageView;
 import javafx.scene.input.Clipboard;
 import javafx.scene.layout.StackPane;
 import javafx.stage.FileChooser;
@@ -34,7 +32,7 @@ public class SendToManyDialog extends Dialog<List<Payment>> {
     private final SpreadsheetView spreadsheetView;
     public static final AddressCellType ADDRESS = new AddressCellType();
 
-    public SendToManyDialog(BitcoinUnit bitcoinUnit) {
+    public SendToManyDialog(BitcoinUnit bitcoinUnit, List<Payment> payments) {
         this.bitcoinUnit = bitcoinUnit;
 
         final DialogPane dialogPane = new SendToManyDialogPane();
@@ -44,7 +42,8 @@ public class SendToManyDialog extends Dialog<List<Payment>> {
         dialogPane.setHeaderText("Send to many recipients by specifying addresses and amounts.\nOnly the first row's label is necessary.");
         dialogPane.setGraphic(new DialogImage(DialogImage.Type.SPARROW));
 
-        List<Payment> initialPayments = IntStream.range(0, 100).mapToObj(i -> new Payment(null, null, -1, false)).collect(Collectors.toList());
+        List<Payment> initialPayments = IntStream.range(0, 100)
+                .mapToObj(i -> i < payments.size() ? payments.get(i) : new Payment(null, null, -1, false)).collect(Collectors.toList());
         Grid grid = getGrid(initialPayments);
 
         spreadsheetView = new SpreadsheetView(grid) {

src/main/java/com/sparrowwallet/sparrow/event/RequestSendToManyEvent.java

@@ -0,0 +1,17 @@
+package com.sparrowwallet.sparrow.event;
+
+import com.sparrowwallet.drongo.wallet.Payment;
+
+import java.util.List;
+
+public class RequestSendToManyEvent {
+    private final List<Payment> payments;
+
+    public RequestSendToManyEvent(List<Payment> payments) {
+        this.payments = payments;
+    }
+
+    public List<Payment> getPayments() {
+        return payments;
+    }
+}

src/main/java/com/sparrowwallet/sparrow/io/Config.java

@@ -53,6 +53,7 @@ public class Config {
     private boolean signBsmsExports = false;
     private boolean preventSleep = false;
     private Boolean connectToBroadcast;
+    private Boolean suggestSendToMany;
     private List<File> recentWalletFiles;
     private Integer keyDerivationPeriod;
     private long dustAttackThreshold = DUST_ATTACK_THRESHOLD_SATS;
@@ -361,6 +362,15 @@ public class Config {
         flush();
     }
 
+    public Boolean getSuggestSendToMany() {
+        return suggestSendToMany;
+    }
+
+    public void setSuggestSendToMany(Boolean suggestSendToMany) {
+        this.suggestSendToMany = suggestSendToMany;
+        flush();
+    }
+
     public List<File> getRecentWalletFiles() {
         return recentWalletFiles;
     }

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

@@ -491,11 +491,35 @@ public class SendController extends WalletFormController implements Initializabl
         validationSupport.setErrorDecorationEnabled(false);
     }
 
-    public Tab addPaymentTab() {
+    public void addPaymentTab() {
+        if(Config.get().getSuggestSendToMany() == null && openSendToMany()) {
+            return;
+        }
+
         Tab tab = getPaymentTab();
         paymentTabs.getTabs().add(tab);
         paymentTabs.getSelectionModel().select(tab);
-        return tab;
+    }
+
+    private boolean openSendToMany() {
+        try {
+            List<Payment> payments = getPayments();
+            if(payments.size() == 3) {
+                ConfirmationAlert confirmationAlert = new ConfirmationAlert("Open Send To Many?", "Open the Tools > Send To Many dialog to add multiple payments?", ButtonType.NO, ButtonType.YES);
+                Optional<ButtonType> optType = confirmationAlert.showAndWait();
+                if(confirmationAlert.isDontAskAgain() && optType.isPresent()) {
+                    Config.get().setSuggestSendToMany(optType.get() == ButtonType.YES);
+                }
+                if(optType.isPresent() && optType.get() == ButtonType.YES) {
+                    Platform.runLater(() -> EventManager.get().post(new RequestSendToManyEvent(payments)));
+                    return true;
+                }
+            }
+        } catch(Exception e) {
+            //ignore
+        }
+
+        return false;
     }
 
     public Tab getPaymentTab() {