bool MainWindow::isMultitrackValid() const
{
    return m_timelineDock->model()->tractor()
       && !m_timelineDock->model()->trackList().empty();
}
bool MainWindow::isMultitrackValid() const
{
    return m_timelineDock->model()->tractor()
       && !m_timelineDock->model()->trackList().empty();
}