gui->collect_assets(proxy);
mwindow->paste_assets(mwindow->edl->local_session->get_selectionstart(1),
mwindow->edl->tracks->first, 0); // do not overwrite
gui->collect_assets(proxy);
mwindow->paste_assets(mwindow->edl->local_session->get_selectionstart(1),
mwindow->edl->tracks->first, 0); // do not overwrite