private void FixupTracks(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.NewItems != null)
{
foreach (Track item in e.NewItems)
{
if (!item.Playlists.Contains(this))
{
item.Playlists.Add(this);
}
}
}
if (e.OldItems != null)
{
foreach (Track item in e.OldItems)
{
if (item.Playlists.Contains(this))
{
item.Playlists.Remove(this);
}
}
}
}