Re: [Lilypond-auto] Issue 2801 in lilypond: Patch: Approximates cross-staff slurs in VerticalAxisGroup vertical-skylines.

[lilypond]

Comment #67 on issue 2801 by address@hidden: Patch: Approximates  
cross-staff slurs in VerticalAxisGroup vertical-skylines.
http://code.google.com/p/lilypond/issues/detail?id=2801

In outside-staff-spacing, for example, if grobs can slide other under  
grobs, they do, which means that they are no longer part of the sideline.   
It is not a linear distinction:

if (stashable_under_other_grob)
 stash;
else
 place_over

The skyline changes from having the extent of the grob to not in a  
non-gradual way.

This sorta thing can be articulated through mixed integer linear  
programming using 1 for true and 0 for false, but it would become  
mixed-integer quadratic because you're multiplying these 1s and 0s by other  
things that are themselves variables in the linear program.  I know of no  
package that supports this sorta thing and it seems like it'd take for ages  
even if it were possible