I think you're right no one tested the plus icon. Because if someone did, then they would notice that in the bottom bar, there's [-] [+] but in the playlist, it

I think you're right no one tested the plus icon. Because if someone did, then they would notice that in the bottom bar, there's [-] [+] but in the playlist, it's reversed, [+] [-]. What a stupid idea, why it's not consistent?