wallet: minor clean-up of tx.set_rbf() calls

Better to always call it, to make sure inputs have identical sequence numbers.

electrum/gui/kivy/uix/dialogs/tx_dialog.py

@@ -282,8 +282,7 @@ class TxDialog(Factory.Popup):
         except CannotBumpFee as e:
             self.app.show_error(str(e))
             return
-        if is_final:
-            new_tx.set_rbf(False)
+        new_tx.set_rbf(not is_final)
         self.tx = new_tx
         self.update()
         self.do_sign()

electrum/gui/qt/confirm_tx_dialog.py

@@ -111,8 +111,7 @@ class TxEditor:
             self.main_window.show_error(str(e))
             raise
         use_rbf = bool(self.config.get('use_rbf', True))
-        if use_rbf:
-            self.tx.set_rbf(True)
+        self.tx.set_rbf(use_rbf)
 
     def have_enough_funds_assuming_zero_fees(self) -> bool:
         try:

electrum/gui/qt/main_window.py

@@ -3242,7 +3242,6 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger):
         except CannotCPFP as e:
             self.show_error(str(e))
             return
-        new_tx.set_rbf(True)
         self.show_transaction(new_tx)
 
     def _add_info_to_tx_from_wallet_and_network(self, tx: PartialTransaction) -> bool:
@@ -3329,8 +3328,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger):
         except Exception as e:
             self.show_error(str(e))
             return
-        if is_final:
-            new_tx.set_rbf(False)
+        new_tx.set_rbf(not is_final)
         self.show_transaction(new_tx, tx_desc=tx_label)
 
     def bump_fee_dialog(self, tx: Transaction):

electrum/transaction.py

@@ -864,7 +864,8 @@ class Transaction:
     def add_info_from_wallet(self, wallet: 'Abstract_Wallet', **kwargs) -> None:
         return  # no-op
 
-    def is_final(self):
+    def is_final(self) -> bool:
+        """Whether RBF is disabled."""
         return not any([txin.nsequence < 0xffffffff - 1 for txin in self.inputs()])
 
     def estimated_size(self):

electrum/wallet.py

@@ -195,9 +195,8 @@ async def sweep(
         locktime = get_locktime_for_new_transaction(network)
 
     tx = PartialTransaction.from_io(inputs, outputs, locktime=locktime, version=tx_version)
-    rbf = config.get('use_rbf', True)
-    if rbf:
-        tx.set_rbf(True)
+    rbf = bool(config.get('use_rbf', True))
+    tx.set_rbf(rbf)
     tx.sign(keypairs)
     return tx
 
@@ -1303,6 +1302,7 @@ class Abstract_Wallet(AddressSynchronizer, ABC):
         # Timelock tx to current height.
         tx.locktime = get_locktime_for_new_transaction(self.network)
 
+        tx.set_rbf(False)  # caller can set RBF manually later
         tx.add_info_from_wallet(self)
         run_hook('make_unsigned_transaction', self, tx)
         return tx
@@ -1606,6 +1606,7 @@ class Abstract_Wallet(AddressSynchronizer, ABC):
         outputs = [PartialTxOutput.from_address_and_value(out_address, output_value)]
         locktime = get_locktime_for_new_transaction(self.network)
         tx_new = PartialTransaction.from_io(inputs, outputs, locktime=locktime)
+        tx_new.set_rbf(True)
         tx_new.add_info_from_wallet(self)
         return tx_new
 
@@ -1656,6 +1657,7 @@ class Abstract_Wallet(AddressSynchronizer, ABC):
             raise CannotDoubleSpendTx(_("The output value remaining after fee is too low."))
         outputs = [PartialTxOutput.from_address_and_value(out_address, value - new_fee)]
         tx_new = PartialTransaction.from_io(inputs, outputs, locktime=locktime)
+        tx_new.set_rbf(True)
         tx_new.add_info_from_wallet(self)
         return tx_new
 
@@ -2301,9 +2303,8 @@ class Abstract_Wallet(AddressSynchronizer, ABC):
         if locktime is not None:
             tx.locktime = locktime
         if rbf is None:
-            rbf = self.config.get('use_rbf', True)
-        if rbf:
-            tx.set_rbf(True)
+            rbf = bool(self.config.get('use_rbf', True))
+        tx.set_rbf(rbf)
         if not unsigned:
             self.sign_transaction(tx, password)
         return tx