On 2018-09-12 10:30 pm, Federico Bruni wrote:
You are right, it seems weird.
If you check your property-init.ly file you'll find these definitions:
stemUp = \override Stem.direction = #UP
stemDown = \override Stem.direction = #DOWN
stemNeutral = \revert Stem.direction
But I don't know what's happening here.
Something fishy with grace notes, I think. Consider the following:
%%%%
\version "2.19.82"
<< { b'4 \stemUp b'4 \grace { \stemDown b'8 }
\stemNeutral b'4 \stemNeutral b'4 } >>
%%%%
The occurrence of b'4 after the grace should be stem-down as that is its
neutral direction.
What is odd is that this behavior is unique to Stem.direction as far as
my testing has shown. If you redefine \stemUp, \stemDown, and
\stemNeutral to, say, change the Stem.color, then the fault does not
occur. Grace (or acciaccatura) notes must be special-cased in how they
work with Stem.direction. (I believe that grace notes are neutrally
stem-up regardless of position on the staff.) And something is not
playing nice with normal \override/\revert logic.
-- Aaron Hill
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