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

[lilypond]

Comment #54 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

I agree that this is likely what's happening, but I can't figure out why.

The problem is that it is impossible to recreate outside of the regtests (I  
tried -fkeep-inline-functions, applying different patches, etc. but to no  
avail).

My guess is that somewhere in the slur-scoring code, using pure heights and  
pure offsets is leading to inconsistent results.  They have never been used  
this far downstream before, so I'm guessing that they may be freed up  
earlier.  But at least the inconsistency is consistent - I'm getting  
4.9456964833876 whenever it does go off track.