if the media isn't seekable the seek slider needs to be disabled
if the media isn't seekable the seek slider needs to be disabled

svn path=/branches/work/kdelibs-phonon/phonon/; revision=516731

sandsmark/phonon-visualization-gsoc,sandsmark/phonon-visualization-gsoc,sandsmark/phonon-visualization-gsoc,sandsmark/phonon-visualization-gsoc