Comment #3 on issue 2460 by [email protected]: StaffGroup barlines should be whited-out to allow better Lyrics and Dynamics placement
http://code.google.com/p/lilypond/issues/detail?id=2460
I'm not saying this isn't an improvement, but if vocal music is set properly, it's not actually a problem. Gould again, page 463: .. barline on the left of the system... "Otherwise, each vocal stave always has separate barlines, to avoid intersecting the text."
