Comment #3 on issue 2851 by [email protected]: Patch: Corrects beamed cross-staff stems' pure heights
http://code.google.com/p/lilypond/issues/detail?id=2851
Closely related but could be separate - 2801 is blocked by this, but I can only know how to proceed w/ this by working on 2801 as 2801 reveals this bug. I'll try to cook up a regtest that can show this bug w/o 2801.
