void ConsoleProgressObserver::eraseCurrentPercentageString()
{
    const int charsToErase = m_percentage == 0 ? 2 : m_percentage < 10 ? 3 : 4;
    // move cursor left
    std::cout << QString(charsToErase, QChar(QLatin1Char('\b'))).toLocal8Bit().constData();
    // erase via spaces
    std::cout << QString(charsToErase, QChar(QLatin1Char(' '))).toLocal8Bit().constData();
    // move cursor left again
    std::cout << QString(charsToErase, QChar(QLatin1Char('\b'))).toLocal8Bit().constData();

#if 0
    // old implementation
    // (1) Move cursor before the old percentage string.
    // (2) Erase current line content to the right of the cursor.
    std::cout << QString::fromLatin1("\x1b[%1D").arg(charsToErase).toLocal8Bit().constData();
    std::cout << "\x1b[K";
#endif
}