Re: [Lilypond-auto] Issue 2990 in lilypond: \RemoveEmptyStaves in StaffGroup context crashes

[lilypond]

Comment #25 on issue 2990 by address@hidden: \RemoveEmptyStaves in StaffGroup  
context crashes
http://code.google.com/p/lilypond/issues/detail?id=2990

At any rate, the whole exercise is there for building some sort of directed  
graph.  If we can have a sensible description of what is actually supposed  
to happen here, it should be reasonably easy to come up with a set of  
operations that preserve the fundamental graph properties without requiring  
additional checks.