[Lilypond-auto] Issue 3631 in lilypond: 2.17 does a worse job using skylines for the page layout than 2.16

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Critical Regression

New issue 3631 by address@hidden: 2.17 does a worse job using skylines for the  
page layout than 2.16
http://code.google.com/p/lilypond/issues/detail?id=3631

If you take a look at the output of

\new Voice \repeat unfold 50
{ c,4 \repeat unfold 30 r4 c''''4 \repeat unfold 30 r4 }

then 2.16.2 does quite a good job doing the page layout  
while "interleaving" the notes which stick out.

Indeed, Page_layout_problem::append_system juggles with skylines already in  
2.16.2.

In 2.16, we get reasonable spacing taking up 9 pages.  In 2.17, in  
contrast, there is a lot of additional spacing without a good explanation.   
The page totals are 10.  The line breaks are the same either way: 9 bars  
per line, with an inexplicable change to 8 bars per line after measure  
720.  Interestingly, this change to 8 bars per line happens synchronous  
with the last page break for 2.16, and in the middle of a page for  
2.17.30.  It would almost seem like 2.17 starts with some of the breaking  
decisions of 2.16, and then does something entirely different.

Since 2.16 did a _better_ job of integrating skylines into its pagebreak  
decisions, I am marking this as a regression.  I don't see that we can  
release 2.18 while this problem has not been tracked down and dealt with.

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