void MainWindow::on_actionCut_triggered()
{
    m_timelineDock->show();
    m_timelineDock->raise();
    m_timelineDock->removeSelection(true);
}
void MainWindow::on_actionCut_triggered()
{
    m_timelineDock->show();
    m_timelineDock->raise();
    m_timelineDock->removeSelection(true);
}