FX Player : yet another streaming server

I don't know if this is a bug or a feature, but my opinion is that it is
strange that the player chooses the next song from the selected playlist
i.s.o. the playlist that was selected when playing starts.
To give a example: I would like to use the playlist as being a sort of
queue. So songs will be added on the fly, but now the behaviour is that
while I'm searching for my next song the next song of the media library
will be played i.s.o. the next song of the playlist.