Re: Issue 1612 in lilypond: Change staff produces long stems

[lilypond]

Comment #2 on issue 1612 by address@hidden: Change staff produces  
long stems
http://code.google.com/p/lilypond/issues/detail?id=1612

More news.
When one beams these beams manually, the problem goes away (and the beam is  
correctly identified as not being cross staff).

I would recommend, then, that someone who knows auto-beam-engraver.cc  
better than I take a look at how/why its behavior would be different than  
beam-engraver.cc with respect to these context changes.