Comment #41 on issue 3560 by [email protected]: Completion_heads_engraver
with \scaleDurations
http://code.google.com/p/lilypond/issues/detail?id=3560
This patch doesn't change the default behavior, so the original email
request
<http://lists.gnu.org/archive/html/bug-lilypond/2013-09/msg00061.html> and
issue 1772 each need overrides of 'completionFactorUnit' to get their
desired behaviors.
But it is very hard to work out in the "ancient melody" regression test
what scaling factors are in effect, and thus why the various settings of
completionFactorUnit work as they do.
There is a 'todo' comment in the patch suggesting a new property, maybe
called 'completionFactor', to set the preferred scaling of the split notes,
which \scaleDurations would update. If that is implemented, we won't need
the complexity of this patch, so let's just skip to what we really want.
Let \scaleDurations 2/3 {..} and \tuplet 3/2 {..} set completionFactor to
2/3 (times any previously set value for when \tuplets are nested) at the
beginning of the {..} and revert it at the end. Let Completion_*_engraver
split notes into durations that use completionFactor. Then
\scaleDurations 2/1 { c4 d2 c4 } => { c4*2 d4*2~ | d4*2 c4*2 }
{ d1*3/2 r2 } => { d1~ | d2 r2 }
{ c2 d1 c2 } => { c2 d2~ | d2 c2 }
and everybody wins.
(Better if \tuplet and \scaleDurations and \times insert events that
Completion_*_engraver listens for, instead of PropertySets, just in case
somebody moves the Completion_*_engraver to Staff context, for some
unforeseen reason.)
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