When I add an album to a folder twice, it doesn't warn me about the duplicate

[blabala22]

When I add an album to a folder twice, it doesn't warn me about the duplicate, and that playlist appears in the folder twice.

When I was adding all the Lotr and Hobbit Soundtracks to a folder, there was like 20 playlists and I couldn't keep track of the duplicate playlists because their names were too long, a confirmation dialogue box would be very helpful.