Check if song is already in playlist before adding

I posted this in the Playlists section too.

I would like Audirvana to warn me if a song is already in a playlist when I try to add it to that playlist. Currently, Audirvana lets me add the same song to a playlist as many times as I want, with no warning. This causes me to spend a lot of time sorting my playlists by song title and then removing duplicates.

It should be possible for Audirvana to warn me that the song is already in a playlist when I try to add it.