Re: [Lilypond-auto] Issue 3518 in lilypond: Support temporary divisi staves

[lilypond]

Comment #10 on issue 3518 by address@hidden: Support temporary divisi staves
http://code.google.com/p/lilypond/issues/detail?id=3518

> The outline in the comment above seems promising (assuming you  
> meant "removed whenever the divisi staves survive"),

You don't want to know how often I replaced "do" with "don't"  
and "non-divisi" with "divisi" and "staff" with "staves" when writing  
that.  Changed the comments again.

I think the original hack on the mailing list worked with explicit markers  
for getting and relinquishing divisi.  The cost of typesetting a whole set  
of divisi staves that are going to be junked seems somewhat expensive.

My first idea was to use code akin to addQuote for recording the non-divisi  
material, and then cleaning any items-worth-living-for from the  
divisi-but-with-non-divisi-filled-in staves going on to final typesetting  
at time steps already covered by non-divisi material, arriving at  
items-worth-living-for suitable for the keep-non-divisi decision.

But making the addQuote mechanism work nicely for more than one context  
seems tricky.  So I think a first version just working with a somewhat  
larger set of material to throw away, at least as a reference point, might  
be preferable.

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