[TxMt] losing my stars

I was wondering if there is some way to preserve the lines I've ticked with bookmark stars after the file is updated by subversion. Right now, I find that a half-dozen or so lines I've marked are all blown away after an svn up brings new code in from commits by my coworkers (actually, there's also one new bookmark created, on the last line). I can see that this is fairly tricky, since the bookmarks would have to be bound to the content of the line, and not just to the line number (though even having them stay put while code slid up or down would be better than having them all vanish - maybe they could go orange or something to suggest they weren't marking the same code any more?). -T.