Re: stemNeutral problem

[Aaron Hill]

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

stemdir.cropped.png
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