Re: Issue 1555 in lilypond: Multiple warnings concerning staff-affinities

[lilypond]

Comment #7 on issue 1555 by address@hidden: Multiple warnings  
concerning staff-affinities
http://code.google.com/p/lilypond/issues/detail?id=1555

Lilypond needs a better message here, to let users know the ordering of  
non-staff lines is not consistent with their vertical spacing settings, and  
give them words to search for in the NR.

> Through some mistake of copy and paste the Lyric lines have affinities
> CENTER, UP, DOWN.

Lilypond and I are both confused here.  Did your copy/paste error delete  
the staff between CENTER and UP Lyrics?   In order to proceed, she will  
change one staff-affinity so the whole system goes #f CENTER CENTER DOWN  
#f, and should warn you that she is doing so.

The existing "staff-affinities should only decrease" is too specific,  
applying only to the case of a single group of non-staffs.  Aren't we  
allowed to have DOWN #f CENTER #f UP ?

There should be only one warning per mis-ordered non-staff.  Can we
 after->set_property("staff-affinity", after_affinity);
after the warning() in page-layout-problem.cc ?

855           Direction after_affinity = to_dir (after->
 get_maybe_pure_property ("staff-affinity", pure, start, end));
856           if (after_affinity > before_affinity)
857             {
858               warning (_ ("staff-affinities should only decrease"));
859               after_affinity = before_affinity;
860             }