Playlist: Add a show track numbers

Description

Request from a Store user:

When adding audio files from an audio book to a playlist, the track numbers disappear.

This makes it extremely difficult for anyone like me, who is visually imapir3d to keep track of where in an audiobook I am.

In other words, it could be interesting to add a new option in the three dot menu, just like "show track numbers" for albums that would show track numbers for playlist, or show the ordering handles. Maybe just use the show track numbers.

App mode

Smartphone