Playlists allow you add duplicates

Issue description:

I created a manual playlist, adding tracks on demand. I noticed thar there is no check for duplicate songs


Upload description: Ui bug, no logs

Additional information:



Reproduction steps:



Media provider:

Local device




This is not an UI bug a simple search would have told you :wink:

It is allowed to have duplicates, when you add a single song there’s a number counter next to the playlists to indicate if the song is already present in that playlist or not.

There’s also a 3 dots menu in the playlist to remove duplicates if you add some by mistake and don’t want them.