qml: show extra fee in ConfirmTxDialog (2fa)

electrum/gui/qml/components/ConfirmTxDialog.qml

@@ -106,6 +106,24 @@ ElDialog {
                 }
             }
 
+            Label {
+                visible: !finalizer.extraFee.isEmpty
+                text: qsTr('Extra fee')
+                color: Material.accentColor
+            }
+
+            RowLayout {
+                visible: !finalizer.extraFee.isEmpty
+                Label {
+                    text: Config.formatSats(finalizer.extraFee)
+                }
+
+                Label {
+                    text: Config.baseUnit
+                    color: Material.accentColor
+                }
+            }
+
             Label {
                 text: qsTr('Fee rate')
                 color: Material.accentColor

electrum/gui/qml/qetxfinalizer.py

@@ -9,6 +9,7 @@ from electrum.transaction import PartialTxOutput, PartialTransaction
 from electrum.util import NotEnoughFunds, profiler
 from electrum.wallet import CannotBumpFee, CannotDoubleSpendTx, CannotCPFP
 from electrum.network import NetworkException
+from electrum.plugin import run_hook
 
 from .qewallet import QEWallet
 from .qetypes import QEAmount
@@ -227,6 +228,7 @@ class QETxFinalizer(TxFeeSlider):
     _address = ''
     _amount = QEAmount()
     _effectiveAmount = QEAmount()
+    _extraFee = QEAmount()
     _canRbf = False
 
     addressChanged = pyqtSignal()
@@ -257,6 +259,17 @@ class QETxFinalizer(TxFeeSlider):
     def effectiveAmount(self):
         return self._effectiveAmount
 
+    extraFeeChanged = pyqtSignal()
+    @pyqtProperty(QEAmount, notify=extraFeeChanged)
+    def extraFee(self):
+        return self._extraFee
+
+    @extraFee.setter
+    def extraFee(self, extrafee):
+        if self._extraFee != extrafee:
+            self._extraFee.copyFrom(extrafee)
+            self.extraFeeChanged.emit()
+
     canRbfChanged = pyqtSignal()
     @pyqtProperty(bool, notify=canRbfChanged)
     def canRbf(self):
@@ -311,8 +324,11 @@ class QETxFinalizer(TxFeeSlider):
 
         self.update_from_tx(tx)
 
-        #TODO
+        x_fee = run_hook('get_tx_extra_fee', self._wallet.wallet, tx)
-        #x_fee = run_hook('get_tx_extra_fee', self._wallet.wallet, tx)
+        if x_fee:
+            x_fee_address, x_fee_amount = x_fee
+            self.extraFee = QEAmount(amount_sat=x_fee_amount)
+
         fee_warning_tuple = self._wallet.wallet.get_tx_fee_warning(
             invoice_amt=amount, tx_size=tx.estimated_size(), fee=tx.get_fee())
         if fee_warning_tuple: