Re: [Lilypond-auto] Issue 1377 in lilypond: Enhancement: make the last-page spacing more consistent and less tight

[lilypond]

Comment #22 on issue 1377 by address@hidden: Enhancement: make the last-page  
spacing more consistent and less tight
http://code.google.com/p/lilypond/issues/detail?id=1377

Well, I was in the context of "optimal page breaking".  I am not claiming  
that this patch in particular caused issue 3341.  And indeed, it reverts  
cleanly (apart from a merge conflict in a comment which is irrelevant) and  
the reverted version still shows the same effect.  So it is clear that this  
patch is not responsible for issue 3341.

But we still have a global page spacing engine that is basically out of  
control.  We have no actual tests for checking that it does anything  
anywhere close to what it claims to do with regard to global optimization:  
all fixes to the algorithms have been to exclude excruciatingly bad  
decisions.

But we have no positive evidence that we don't just get a random (or even  
the worst) choice among tolerable choices.  And the decisions are made  
independently from the actual spacing, based on a rectangular rather than a  
skyline model.  And the rectangular model does not even share the same code  
with other positioning mechanisms, so discrepancies can (and will) occur.

We've had anecdotal reports that people continued using 2.12 (or 2.14)  
since the overall page breaking got worse since then.  They may or may not  
be incorrect, but we don't really have tests that would give us sufficient  
confidence to state "we are pretty certain you are wrong about that".

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