private void dragAndDropMan_MetaReadyForDraggy(string filename, VideoMetadataUseful meta)
{
___UiTransactionBegin();
var newLengthFrames = dragAndDropMan.Draggies.FirstOrDefault().LengthInFrames;
UiObjects.SetDraggyCoordinates(
text: "" + newLengthFrames + "\nframes",
frameLength: newLengthFrames
);
___UiTransactionEnd();
}