item->referencedClip()->setProducer(producer, replace);
item->referencedClip()->askForAudioThumbs();
if (!replace && item->data(0, Qt::DecorationRole).isNull())
item->referencedClip()->setProducer(producer, replace);
item->referencedClip()->askForAudioThumbs();
if (!replace && item->data(0, Qt::DecorationRole).isNull())