Method bumpFee

src/qt/walletmodel.cpp:464–551

}

bool WalletModel::bumpFee(Txid hash, Txid& new_hash)
{
    CCoinControl coin_control;
    std::vector<bilingual_str> errors;
    CAmount old_fee;
    CAmount new_fee;
    CMutableTransaction mtx;
    if (!m_wallet->createBumpTransaction(hash, coin_control, errors, old_fee, new_fee, mtx)) {
        QMessageBox::critical(nullptr, tr("Fee bump error"), tr("Increasing transaction fee failed") + "<br />(" +
            (errors.size() ? QString::fromStdString(errors[0].translated) : "") +")");
        return false;
    }

    // allow a user based fee verification
    /*: Asks a user if they would like to manually increase the fee of a transaction that has already been created. */
    QString questionString = tr("Do you want to increase the fee?");
    questionString.append("<br />");
    questionString.append("<table style=\"text-align: left;\">");
    questionString.append("<tr><td>");
    questionString.append(tr("Current fee:"));
    questionString.append("</td><td>");
    questionString.append(BitcoinUnits::formatHtmlWithUnit(getOptionsModel()->getDisplayUnit(), old_fee));
    questionString.append("</td></tr><tr><td>");
    questionString.append(tr("Increase:"));
    questionString.append("</td><td>");
    questionString.append(BitcoinUnits::formatHtmlWithUnit(getOptionsModel()->getDisplayUnit(), new_fee - old_fee));
    questionString.append("</td></tr><tr><td>");
    questionString.append(tr("New fee:"));
    questionString.append("</td><td>");
    questionString.append(BitcoinUnits::formatHtmlWithUnit(getOptionsModel()->getDisplayUnit(), new_fee));
    questionString.append("</td></tr></table>");

    // Display warning in the "Confirm fee bump" window if the "Coin Control Features" option is enabled
    if (getOptionsModel()->getCoinControlFeatures()) {
        questionString.append("<br><br>");
        questionString.append(tr("Warning: This may pay the additional fee by reducing change outputs or adding inputs, when necessary. It may add a new change output if one does not already exist. These changes may potentially leak privacy."));
    }

    const bool enable_send{!wallet().privateKeysDisabled() || wallet().hasExternalSigner()};
    const bool always_show_unsigned{getOptionsModel()->getEnablePSBTControls()};
    auto confirmationDialog = new SendConfirmationDialog(tr("Confirm fee bump"), questionString, "", "", SEND_CONFIRM_DELAY, enable_send, always_show_unsigned, nullptr);
    confirmationDialog->setAttribute(Qt::WA_DeleteOnClose);
    // TODO: Replace QDialog::exec() with safer QDialog::show().
    const auto retval = static_cast<QMessageBox::StandardButton>(confirmationDialog->exec());

    // cancel sign&broadcast if user doesn't want to bump the fee
    if (retval != QMessageBox::Yes && retval != QMessageBox::Save) {
        return false;
    }

    // Short-circuit if we are returning a bumped transaction PSBT to clipboard
    if (retval == QMessageBox::Save) {
        // "Create Unsigned" clicked
        PartiallySignedTransaction psbtx(mtx);
        bool complete = false;
        const auto err{wallet().fillPSBT({.sign = false, .bip32_derivs = true}, nullptr, psbtx, complete)};
        if (err || complete) {
            QMessageBox::critical(nullptr, tr("Fee bump error"), tr("Can't draft transaction."));