Seeking does not work, if triggered from last few seconds of file

Seeking does not work, if triggered from last few seconds of file.

How to repeat: play a file (tested on wav, ape and flac) to the very end (or seek there - just a couple of seconds before end) and then use slider to seek to any place in file - slider will go, decoders and playback won't
Affected versions: 0.07, svn head (may be others)

It seems to me that there's smth gets destroyed when last chunk of file is filled into buffer