Prevent duplicates in playlists

[babydinosaur]

I dragged a song into a playlist, and MM said it was already there and asked me if I wanted a duplicate. I clicked 'no' and also clicked 'don't ask me again' because I wanted that to be the default action.
However, now when I copy a duplicate song into a playlist, MM doesn't ask me (good), but it does add the song as a duplicate now (definitely not good).
I can't find an option to get MM to ask me again if I want duplicates. The 'Confirmations' section of Options doesn't include this.
Any thoughts? Thanks

[Lowlander]

Tools > Options > Tags & Playlists has the option.

[babydinosaur]

Tools > Options > Tags & Playlists has the option.

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[Peke]

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