Comment #18 on issue 3560 by [email protected]: 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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