docs: protected void updateTrackState( SetTrackInfo<Desc> info ) {
  		// update tracks
  		for( int i = 0; i < info.matches.size; i++ ) {
  			AssociatedIndex indexes = info.matches.data[i];
  			PointTrack track = info.tracks.get(indexes.src);
  			Point2D_F64 loc = info.locDst.data[indexes.dst];
  			track.set(loc.x, loc.y);
  			tracksActive.add(track);
  
  			// update the description
  			if(updateDescription) {
  				((Desc)track.getDescription()).setTo(info.featDst.get(indexes.dst));
  			}
  
  			info.isAssociated[indexes.src] = true;
  		}
  	}