How to click OK when pressing the Return key in Xdialog?

Question

This is part of the source code in the file callbacks.c it handles the return only if the focus is outside the inputbox, how can I modify it to handle return when pressed inside the inputbox?

Xdialog --inputbox Test 10 50

    if (event->type == GDK_KEY_PRESS && (event->keyval == GDK_Return ||
                                         event->keyval == GDK_KP_Enter)) {
            if (Xdialog.default_no)
                    Xdialog.exit_code = 1;
            else
                    Xdialog.exit_code = 0;

            return(FALSE);
    }

https://github.com/wdlkmpx/Xdialog