Re: [Lilypond-auto] Issue 3560 in lilypond: Completion_heads_engraver with \scaleDurations

[lilypond]

Comment #18 on issue 3560 by address@hidden: Completion_heads_engraver with  
\scaleDurations
http://code.google.com/p/lilypond/issues/detail?id=3560

Presumably with a resulting scale factor of 2/3 while the original note has  
a scale factor of 6.  So we want neither 6 nor 1 as a result here but  
rather 2/3.

Getting that result is of course feasible: \scaleDuration would just have  
to emit
(make-music 'CompletionFactor 'duration (ly:make-duration 0 0 2/3)) at its  
start and
(make-music 'CompletionFactor 'duration (ly:make-duration 0 0 1)) at its  
end.
Of course, an explicit 'duration field here is required in order to have  
nested \scaleDurations and \tuplet/\time do the right thing.

I am not convinced that the level of expectations set into  
Completion_heads_engraver is actually sane.  I lean towards a simpler  
either/or solution taking the factor as either 1 or the original factor,  
with a reasonably simple knob for tweaking the decisionmaking.

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