Re: Issue 2180 in lilypond: beams are detached from stems

[lilypond]

Comment #6 on issue 2180 by address@hidden: beams are detached from  
stems
http://code.google.com/p/lilypond/issues/detail?id=2180

Can't write music anymore...thoughts too clear...LilyPond development makes  
brain mushier, thus more conducive to composition...

Spending 10 minutes tracing this bug through the stream via valgrind, I  
think I've found the problem.  Dot_column::calc_positioning_done, which is  
chained to dots as an x_parent_positioning callback, calls position_less.   
This is lethal - it looks up unpure Y extents at a time where they need to  
be calculated purely.  I have no clue how lilypond survived for so long  
without this surfacing.

Back to composition...