When I search for songs in library, I don't know where the song are saved. And when I search for songs there is no way of knowing if you've already have that song, unless you check every playlist by filtering...
Also, not all songs appear when I search for it. Why? When I filter the playlist it comes up, but not in library filter. I think I have found this problem in a playlist search also, but I'm not sure.
This problem appear with collaborative playlists as well as normal playlists. Library should list everything, even if it's from subrscribed plalists.
A third problem I've found is that when you press the album cover (playing now) and you queued the song, you are redirected to library rather than the playlist. This would be fine as long as I knew where the song came from.