void MainWindow::onPlaylistDockTriggered(bool checked)
{
    if (checked) {
        m_playlistDock->show();
        m_playlistDock->raise();
    }
}
void MainWindow::onPlaylistDockTriggered(bool checked)
{
    if (checked) {
        m_playlistDock->show();
        m_playlistDock->raise();
    }
}