Allow browsing inside m3u playlists.

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This is ncmpcpp's playlist editor

I disabled all editing keyboard shortcuts and use ncmpcpp's playlist editor as a playlist browser.
ncmpc doesn't allow me to browse inside m3u playlists.

My m3u playlist

#EXTM3U
#EXTINF:-1,FM KARUIZAWA (長野)
http://musicbird.leanstream.co/JCB108-MP3#charset=xxx&StreamName=FM%20KARUIZAWA%20%28%E9%95%B7%E9%87%8E%29
#EXTINF:-1,FM はつかいち 76.1 (広島)
http://musicbird.leanstream.co/JCB083-MP3#charset=xxx&StreamName=FM%20%E3%81%AF%E3%81%A4%E3%81%8B%E3%81%84%E3%81%A1%2076.1%20%28%E5%BA%83%E5%B3%B6%29

[MaxKellermann]

Is this about playlists in the playlist_directory or about arbitrary playlist files?

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playlists in the playlist directory.