Re: Issue 1565 in lilypond: Changing staff with manual beaming can give very long stems

[lilypond]

Comment #3 on issue 1565 by address@hidden: Changing staff with manual  
beaming can give very long stems
http://code.google.com/p/lilypond/issues/detail?id=1565

I think Han Wen can fix this a lot faster than I can.

In my original Issue 37 work, you'll see that cross-staff beams were  
excluded from all collision resolution.  Back then, collision resolution  
was a separate function.  Here, you've rolled it into  
shift_region_to_valid.  If you can add an `if' clause for is_cross_staff  
that bypasses the bits of collision-related code you added, this should  
clear up the problem.