m3u playlists files are displayed with an "Untitled" title
This issue is somewhat related to #72 (closed) .
Tracker indexes m3u files as playlists and Music displays them in the Playlists view. However, these playlists are displayed with the "untitled" title. This becomes cumbersome when you have a lot m3u files: you're gonna have a lot of "untitled" in the sidebar. This is disturbing.
From #72 (closed) , one should assume that we should not be able to rename these playlists. In that case, I think that we should use the basename from the playlist filename as title.