Notehead substitution and Slur overrides

[Matthew Fong]

Hello everyone,

I am having trouble understanding why a notehead substitution function would interfere with some slur overrides. Any insight or help would be deeply appreciated.

Function in question takes a note at a pitch, and puts a quilisma graphic in its place (a bunch of PostScript commands I've stored in a variable):

noteQuilisma =
#(define-music-function (note) (ly:music?)
  #{

    \tweak NoteHead.stencil #ly:text-interface::print
    \tweak NoteHead.text \markup {
      \scale #'(0.24 . 0.24)
      \override #'(filled . #t)
      \path #0.0 #quilismaPathGreciliae
    }
    \tweak NoteHead.X-offset #0
    \tweak Stem.stencil ##f
    #note
  #}
)

However, when I use the following Slur overrides, they don't appear to work unless I use some much larger numbers than I would expect. Take away the quilisma, and it looks as expected.

\layout {
    \context {
        \Voice
        \override Slur.height-limit = #2.5
        \override Slur.ratio = #0.3
        \override Slur.minimum-length = #1.5
        \override Slur.details.free-head-distance = #1
    }
}

Examples

1. Without \noteQuilisma on e (slur is adjusted as expected)

2. WIth \noteQuilisma on e (slur is not adjusted)

3. WIth \noteQuilisma on e, and Slur.height-limit set to #5, and Slur.ratio set to 0.5 (ugly result, and much larger adjustment than expected)

Many thanks,

mattfong