outputBuffer: fix buffer_before_play handling

buffer_before_play is a prebuffer; always respecting it
is almost as good as having no buffer at all. So we only
respect it when we haven't played anything.

Bugs that were a side effect of this also got fixed:

  The player would not stop when we got to the end of the last
  song on non-repeating playlists.  The playlist would
  continuously show the song in the last few seconds of
  playback, and never move.

  Having crossfade enabled would also amplify the above effect.
  So, as a side effect, crossfade now correctly handles
  end-of-playlist conditions, as well.  It will fade out to
  silence when we're at the end of a playlist.

0 files changed, 0 insertions, 0 deletions