Re: font size override and grace notes

[Matt Cary]

> > better use \once to override the size of the g, or revert the note heads
> > size after the slashed grace is done:
> >
> > \override NoteHead #'font-size = #4    g
> > \slashedGrace                                  a16( 
> > \revert NoteHead #'font-size              b8)
> 
> In this particular case, it would likely be safer to use a \tweak.
> tweaks are not timing-related and thus are impervious to the quirks of
> grace note timing.
> 

Thanks for the advice. I guess I'm surprised the revert doesn't happen 
immediately. This arose in a more complicated context where I don't think 
doing tweaks is relevant; the initial override is from a function where I'm 
notating a strum.

strumFn = 
#(define-music-function
  (parser location strums)
  (ly:music?)
   #{
      \set squashedPosition = #-2
      \override NoteHead #'style = #'slash
      \override NoteHead #'font-size = #1
      \override Beam #'positions = #'(4 . 4)
      \override Stem #'length = #8
      \override Accidental #'stencil = ##f
      \override AccidentalCautionary #'stencil = ##f

      \stemUp
      #strums
      \stemNeutral

      \unset squashedPosition
      \revert NoteHead #'style
      \revert NoteHead #'font-size
      \revert Beam #'positions
      \revert Stem #'length
      \revert Accidental #'stencil
      \revert AccidentalCautionary #'stencil

   #})

\new Voice = "melody" \with {
    \consists "Pitch_squash_engraver" 
} {
 \strumFn { c8[ c] } \acciaccatura a'16 b'8
}

\version "2.16.0"