Re: [Lilypond-auto] Issue 3631 in lilypond: 2.17 does a worse job with vertical spacing and/or the page layout than 2.16

[lilypond]

Comment #36 on issue 3631 by address@hidden: 2.17 does a worse job  
with vertical spacing and/or the page layout than 2.16
http://code.google.com/p/lilypond/issues/detail?id=3631

Just confirming that the patch does fix a real problem.  Currently things  
like Clefs, that appear depending on line breaks, are ignored in page-break  
planning.  If anyone does something like
 { \override Staff.Clef #'font-size = #6
   \repeat unfold 20 {R1 \break} }
the pages are overfull.  The patch fixes that problem.

It was surprising that allowing /more/ space for clefs made David's example  
take /fewer/ pages.  Due to the unspeakable complexity of  
the 'part_of_line_pure_height' estimation for page-breaking, the BarNumber  
is placed against staff-lines-only of the top-most StaffSymbol, and the  
assumed position of the StaffSymbol in the System takes into account only  
the first measure in the tentative line.  If there are no high notes in the  
first measure, the upper loop of the Clef moves the StaffSymbol down, and  
thus the BarNumber.

I regret wasting the time figuring out why, but the patch works.

Attachments:
        3631.png  6.5 KB

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