Status: Accepted
Owner: ----
Labels: Type-Critical Regression
New issue 3631 by [email protected]: 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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