Comment #37 on issue 2801 by [email protected]: Patch: Approximates cross-staff slurs in VerticalAxisGroup vertical-skylines.
http://code.google.com/p/lilypond/issues/detail?id=2801
Because this sort of thing never showed up when I was working on a private branch, even when I was using it as a baseline against other changes.
I'll revert it and cherry pick it to a private branch to see if I can make it show up. If not, I'll need people's help to reproduce the bug.
