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

[lilypond]

Comment #15 on issue 3560 by address@hidden: Completion_heads_engraver  
with \scaleDurations
http://code.google.com/p/lilypond/issues/detail?id=3560

> I certainly agree with Keith that the listed use cases would be "nice to  
> have".

All stable versions of LilyPond support the use cases of splitting notes  
longer than a measure, and up through version 2.12 {\time 9/8 a1*9/8*5 }  
was supported as well.   Given the patch for issue 1532, versions 2.14 and  
2.16 intentionally support splitting of c1*3 into three whole notes.

It would be slightly unfriendly to withdraw that support now.

The completion_engraver seems to have generated unscaled durations from  
scaled input for a long time
 http://lists.gnu.org/archive/html/lilypond-user/2005-09/msg00369.html
then it was made to preserve fractional timing for tuplets
 https://lists.gnu.org/archive/html/lilypond-devel/2010-05/msg00094.html
and within a about year there were two bug reports missing the old behavior
 http://code.google.com/p/lilypond/issues/detail?id=1532
 http://lists.gnu.org/archive/html/bug-lilypond/2011-07/msg00606.html

> Wrong engraver for the task.

Is there an engraver that would be better for the task?

We should try to find a dividing line between the old use to split c1*5  
into whole notes and the relatively new use to split notes in time-scaled  
music.  The patch for issue 1532 set a dividing line, but did not document  
it.  (Also, the docs still say that completion_*_engraver fails to generate  
tuplet notes.)

Maybe, divide based on whether the input durations to the  
completion_*_engraver are longer or shorter than measureLength:
 longer notes split into notes with scale *1
 shorter notes split into notes with the same scale as input

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