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