player: Spotify playlist search stalls sometimes

[juanrubio]

Description

The Spotify playlist search sometimes stalls if the playlist being located is one of the Spotify-provided playlists.

Steps to Reproduce

1. Go to Spotify, and 'follow' a Spotify-made playlist.
2. Try to play this playlist in tizonia.
3. Tizonia prints the user-created playlists. but no Spotify-made playlists ever appear. and the program stalls.

Expected behavior:
No stalling. Tizonia ends up playing some other playlist (e.g. feeling lucky?)

NOTE: libspotify seems to have a problem with Spotify-made playlists. These playlists never become 'ready', so they can't be played by tizonia.

Actual behaviour:
Program stalls

Reproduces how often:
Every time with a Spotify-made playlist.

Versions

All versions

Installation Method Used

All installation methods

Additional Information

Any additional information, configuration or data that might be necessary to
reproduce the issue.

[juanrubio]

Related to #471