Re: staffSize music function unreliable at LP v2.19.16

[David Nalesnik]

On Tue, Mar 3, 2015 at 3:44 PM, David Nalesnik <address@hidden> wrote:

Harm,

On Tue, Mar 3, 2015 at 3:30 PM, Thomas Morley <address@hidden> wrote:

thanks for testing. So this function may use as a test-case.

No idea whats causing this bug, though. And because I'm not able to
reproduce it, I can't help furthermore :(

I don't think I could do anything either.  I wouldn't know how to build LilyPond for Windows to verify any fix...

An observation.  In the following snippet, you'll note in the log output  that the default-direction of the downstemmed F and B is 0--CENTER.  This means that Stem::calc-direction (in lily/stem.cc) will take the property 'neutral-direction.  This property is supposed to specify the direction of a note on the midline--B only in our case.  F should have a default-direction of 1.

 \version "2.19.16"

staffSize = #(define-music-function (parser location new-size) 

               (number?)

                #{

                  \set fontSize = #new-size

                  \override StaffSymbol.staff-space = #(magstep new-size)

                  \override StaffSymbol.thickness = #(magstep new-size)

                #})

Ab = \relative c' { f4 g a b c d e f }

\score {

  \new Staff  \with { \staffSize #2 }

  {

    \override Stem.after-line-breaking =

    #(lambda (grob)

       (format #t "~a default-direction: ~a~%"

         grob

         (ly:grob-property grob 'default-direction)))

    \Ab

  } 

  \layout { }

}