Re: [Lilypond-auto] Issue 1532 in lilypond: completion_heads_engraver mangles original durations

[lilypond]

Comment #4 on issue 1532 by address@hidden: completion_heads_engraver mangles  
original durations
http://code.google.com/p/lilypond/issues/detail?id=1532

See issue 3560.  You state you expect to see c1~ c1 for c1*2 rather than  
c2*2~ c2*2.

So you would say that LilyPond is wrongly omitting one c1 in the middle of  
the first measure?  Because c1*2 is supposed to mean the same as c1 c1 when  
the Completion_heads_engraver is active?

\new Voice \with {
    \remove "Note_heads_engraver"
    \consists "Completion_heads_engraver"
}
{ \time 4/1 c1 c1*2 c1*2 c\breve. }

Let's keep in mind what the completion engravers are _indispensible_ for.   
They are indispensible for writing things like a canon in modern notation  
where you don't know in advance which notes will get split in a particular  
voice.  The only notes and rests that are guaranteed to be split are those  
that are strictly longer than a whole measure.  For everything else, the  
bets are off.  They may or may not be split, so it makes little sense to  
change the duration factor depending on whether they are split or not.   
Issue 3560 has a few examples.

I'm afraid the Completion_heads_engraver is not the right tool for  
rewriting c1*2 into c1 c1.  Because it only rewrites durations crossing its  
raster, but if c1*2 should be rewritten, it should _always_ be rewritten.

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