page-turn-breaking with \pageBreak after title page uses awkward breaking (i.e. empty page, not at rest)

[Reinhold Kainhofer]

I'm having problems with page-turn breaking in one of my instrumental scores. 
As the score is 3 pages (with optimal breaking) and has a long rest about 2/3 
into the piece (with enough wiggle room to move the page break to the rest), I 
wanted to add a nice title page (and a \pageBreak before the whole score) and 
let lilypond do page-turn breaking.

Unfortunately, LilyPond gives a warning:

Calculating page and line breaks (1 possible page breaks)...
warning: cannot fit the first page turn onto a single page.  Consider setting 
first-page-number to an even number.

And LilyPond refuses to break the score at the R1*12.

Attached is an example. The page turn between page 3 and 4 should ideally be 
placed at the R1*12, but lilypond refuses to do so, instead breaking at the 
R1*5 and leaving one page empty (so 5 pages are used!).


Is this a bug in the page-turn algorithm?

Cheers,
Reinhold
-- 
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Reinhold Kainhofer, address@hidden, http://reinhold.kainhofer.com/
 * Financial & Actuarial Math., Vienna Univ. of Technology, Austria
 * http://www.fam.tuwien.ac.at/, DVR: 0005886
 * LilyPond, Music typesetting, http://www.lilypond.org

turn-break.ly
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