notification tx absurd fees error fix when estimating a tx size

lib/pages/paynym/dialogs/paynym_details_popup.dart

@@ -26,6 +26,7 @@ import 'package:stackwallet/widgets/desktop/primary_button.dart';
 import 'package:stackwallet/widgets/desktop/secondary_button.dart';
 import 'package:stackwallet/widgets/loading_indicator.dart';
 import 'package:stackwallet/widgets/rounded_container.dart';
+import 'package:stackwallet/widgets/stack_dialog.dart';
 import 'package:tuple/tuple.dart';
 
 class PaynymDetailsPopup extends ConsumerStatefulWidget {
@@ -102,6 +103,20 @@ class _PaynymDetailsPopupState extends ConsumerState<PaynymDetailsPopup> {
         _showInsufficientFundsInfo = true;
       });
       return;
+    } catch (e) {
+      if (mounted) {
+        canPop = true;
+        Navigator.of(context).pop();
+      }
+
+      await showDialog<void>(
+        context: context,
+        builder: (context) => StackOkDialog(
+          title: "Error",
+          message: e.toString(),
+        ),
+      );
+      return;
     }
 
     if (mounted) {

lib/services/mixins/paynym_wallet_interface.dart

@@ -398,6 +398,7 @@ mixin PaynymWalletInterface {
     int additionalOutputs = 0,
     List<UTXO>? utxos,
   }) async {
+    try {
       final amountToSend = _dustLimitP2PKH;
       final List<UTXO> availableOutputs =
           utxos ?? await _db.getUTXOs(_walletId).findAll();
@@ -456,14 +457,18 @@ mixin PaynymWalletInterface {
         targetPaymentCodeString: targetPaymentCodeString,
         utxosToUse: utxoObjectsToUse,
         utxoSigningData: utxoSigningData,
-            change: 0))
+        change: 0,
+        dustLimit:
+            satoshisBeingUsed, // override amount to get around absurd fees error
+      ))
           .item2;
 
       final int vSizeForWithChange = (await _createNotificationTx(
         targetPaymentCodeString: targetPaymentCodeString,
         utxosToUse: utxoObjectsToUse,
         utxoSigningData: utxoSigningData,
-            change: satoshisBeingUsed - amountToSend))
+        change: satoshisBeingUsed - amountToSend,
+      ))
           .item2;
 
       // Assume 2 outputs, for recipient and payment code script
@@ -494,7 +499,8 @@ mixin PaynymWalletInterface {
 
         // check estimates are correct and build notification tx
         if (changeAmount >= _dustLimitP2PKH &&
-          satoshisBeingUsed - amountToSend - changeAmount == feeForWithChange) {
+            satoshisBeingUsed - amountToSend - changeAmount ==
+                feeForWithChange) {
           var txn = await _createNotificationTx(
             targetPaymentCodeString: targetPaymentCodeString,
             utxosToUse: utxoObjectsToUse,
@@ -579,6 +585,9 @@ mixin PaynymWalletInterface {
               "Remaining balance does not cover the network fee.");
         }
       }
+    } catch (e) {
+      rethrow;
+    }
   }
 
   // return tuple with string value equal to the raw tx hex and the int value
@@ -588,7 +597,9 @@ mixin PaynymWalletInterface {
     required List<UTXO> utxosToUse,
     required Map<String, dynamic> utxoSigningData,
     required int change,
+    int? dustLimit,
   }) async {
+    try {
       final targetPaymentCode =
           PaymentCode.fromPaymentCode(targetPaymentCodeString, _network);
       final myCode = await getPaymentCode(DerivePathType.bip44);
@@ -602,7 +613,8 @@ mixin PaynymWalletInterface {
       final buffer = rev.buffer.asByteData();
       buffer.setUint32(txPoint.length, txPointIndex, Endian.little);
 
-    final myKeyPair = utxoSigningData[utxo.txid]["keyPair"] as btc_dart.ECPair;
+      final myKeyPair =
+          utxoSigningData[utxo.txid]["keyPair"] as btc_dart.ECPair;
 
       final S = SecretPoint(
         myKeyPair.privateKey!,
@@ -646,7 +658,9 @@ mixin PaynymWalletInterface {
 
       // todo: modify address once segwit support is in our bip47
       txb.addOutput(
-        targetPaymentCode.notificationAddressP2PKH(), _dustLimitP2PKH);
+        targetPaymentCode.notificationAddressP2PKH(),
+        dustLimit ?? _dustLimitP2PKH,
+      );
       txb.addOutput(opReturnScript, 0);
 
       // TODO: add possible change output and mark output as dangerous
@@ -671,13 +685,21 @@ mixin PaynymWalletInterface {
           vin: i,
           keyPair: utxoSigningData[txid]["keyPair"] as btc_dart.ECPair,
           witnessValue: utxosToUse[i].value,
-        witnessScript: utxoSigningData[utxo.txid]["redeemScript"] as Uint8List?,
+          witnessScript:
+              utxoSigningData[utxo.txid]["redeemScript"] as Uint8List?,
         );
       }
 
       final builtTx = txb.build();
 
       return Tuple2(builtTx.toHex(), builtTx.virtualSize());
+    } catch (e, s) {
+      Logging.instance.log(
+        "_createNotificationTx(): $e\n$s",
+        level: LogLevel.Error,
+      );
+      rethrow;
+    }
   }
 
   Future<String> broadcastNotificationTx(