#1 Playlist UI should show portion with current track

[Jonadab the Unsightly One (Nath]

Currently (both 0.1 and git-snapshot-e067222e69c932a81c8cec7a50bf4a88aa89369d) the playlist UI shows the beginning of the xmms2 playlist (a couple of hundred entries or so, I didn't count, but nowhere near the whole playlist), irrespective of what track is currently being played. I certainly understand the desire to limit the number of tracks shown in the UI, for perf reasons I presume, but it really should show the track currently being played, and the ones preceding and following it, rather than always the beginning. If I am in the middle of my playlist, or near the end, the juxtapose playlist UI is worthless.