quick vSize calc

lib/utilities/extensions/extensions.dart

@@ -9,5 +9,9 @@
  */
 
 export 'impl/big_int.dart';
+export 'impl/box_shadow.dart';
+export 'impl/cl_transaction.dart';
+export 'impl/contract_abi.dart';
+export 'impl/gradient.dart';
 export 'impl/string.dart';
 export 'impl/uint8_list.dart';

lib/utilities/extensions/impl/cl_transaction.dart

@@ -0,0 +1,53 @@
+import 'dart:typed_data';
+
+import 'package:coinlib_flutter/coinlib_flutter.dart';
+
+extension CLTransactionExt on Transaction {
+  int weight() {
+    final base = _byteLength(false);
+    final total = _byteLength(true);
+    return base * 3 + total;
+  }
+
+  int vSize() => (weight() / 4).ceil();
+
+  int _byteLength(final bool allowWitness) {
+    final hasWitness = allowWitness && isWitness;
+    return (hasWitness ? 10 : 8) +
+        _encodingLength(inputs.length) +
+        _encodingLength(outputs.length) +
+        inputs.fold<int>(0, (sum, input) => sum + input.size) +
+        outputs.fold<int>(0, (sum, output) => sum + output.size) +
+        (hasWitness
+            ? inputs.fold(0, (sum, input) {
+                if (input is! WitnessInput) {
+                  return sum;
+                } else {
+                  return sum + _vectorSize(input.witness);
+                }
+              })
+            : 0);
+  }
+
+  int _varSliceSize(Uint8List someScript) {
+    final length = someScript.length;
+    return _encodingLength(length) + length;
+  }
+
+  int _vectorSize(List<Uint8List> someVector) {
+    final length = someVector.length;
+    return _encodingLength(length) +
+        someVector.fold(
+          0,
+          (sum, witness) => sum + _varSliceSize(witness),
+        );
+  }
+
+  int _encodingLength(int number) => number < 0xfd
+      ? 1
+      : number <= 0xffff
+          ? 3
+          : number <= 0xffffffff
+              ? 5
+              : 9;
+}

lib/wallets/wallet/wallet_mixin_interfaces/electrumx_interface.dart

@@ -768,7 +768,7 @@ mixin ElectrumXInterface<T extends Bip39HDCurrency> on Bip39HDWallet<T> {
 
     return txData.copyWith(
       raw: clTx.toHex(),
-      vSize: clTx.size,
+      vSize: clTx.vSize(),
       tempTx: TransactionV2(
         walletId: walletId,
         blockHash: null,

lib/wallets/wallet/wallet_mixin_interfaces/paynym_interface.dart

@@ -866,7 +866,7 @@ mixin PaynymInterface<T extends PaynymCurrencyInterface>
         );
       }
 
-      return Tuple2(clTx.toHex(), clTx.size);
+      return Tuple2(clTx.toHex(), clTx.vSize());
     } catch (e, s) {
       Logging.instance.log(
         "_createNotificationTx(): $e\n$s",