tqt tx dialog: disable "Finalize" btn if tx is None - electrum - Electrum Bitcoin wallet
 (HTM) git clone https://git.parazyd.org/electrum
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       ---
 (DIR) commit 13b858ab26f3eda6e89330ec9dfe707eecc95d62
 (DIR) parent 66ddedb97ea2eef37cb9355de35e5ad534013373
 (HTM) Author: SomberNight <somber.night@protonmail.com>
       Date:   Tue, 19 Nov 2019 19:35:57 +0100
       
       qt tx dialog: disable "Finalize" btn if tx is None
       
       e.g. NotEnoughFunds due to too high fee
       
       Diffstat:
         M electrum/gui/qt/transaction_dialog… |       3 +++
       
       1 file changed, 3 insertions(+), 0 deletions(-)
       ---
 (DIR) diff --git a/electrum/gui/qt/transaction_dialog.py b/electrum/gui/qt/transaction_dialog.py
       t@@ -365,6 +365,7 @@ class BaseTxDialog(QDialog, MessageBoxMixin):
            def update(self):
                if not self.finalized:
                    self.update_fee_fields()
       +            self.finalize_button.setEnabled(self.tx is not None)
                if self.tx is None:
                    return
                self.update_io()
       t@@ -775,6 +776,8 @@ class PreviewTxDialog(BaseTxDialog, TxEditor):
                self.feerounding_icon.setVisible(abs(feerounding) >= 1)
        
            def on_finalize(self):
       +        if not self.tx:
       +            return
                self.finalized = True
                self.tx.set_rbf(self.rbf_cb.isChecked())
                for widget in [self.fee_slider, self.feecontrol_fields, self.rbf_cb]: