Comment 54 for bug 327863

(In reply to comment #46)
> this sounds like the approach roc suggested in comment 26; it corrects the
> visual errors but not the "size changed during incremental reflow" assertions.
> The pres shell is trying to reflow the scrollbars themselves, and AFAICT there
> is nothing the scrollframe can do to stop it.

... even if you do this *instead* of setting the size to 0 (rather than in addition)?