Unexpected behaviour of script-stencil-hack

[Thomas Morley]

Hi folks,

consider the following code.



\version "2.19.13"
%\version "2.16.0"

add-to-script =
#(define-event-function (parser location mrkp music)(markup? ly:music?)
  #{
    \tweak #'stencil
      #(lambda (grob)
         (let (
               ;(X-offset (ly:grob-property grob 'X-offset))
               )
           (ly:stencil-combine-at-edge
             (ly:script-interface::print grob)
             X
             RIGHT
             (grob-interpret-markup grob (markup #:normal-text mrkp))
             0)))
    $music
  #})

{ c''1 \add-to-script \markup "xxxxxxxxxxxxx" \trill }



Hacking Script 'stencil I add markup to the default-stencil. Works as expected.

Though, regard the local binding for X-offset.
With 2.19.13:
Commenting it will center the whole new Script-stencil above the parent.
Uncomment it and you see the default Script-glyph in unchanged
position and the additions right to it.

That's unexpected, at least for me and doesn't happen with 2.16 (don't
have 2.18 on this machine)

Why does this happen? X-offset is _never_ called in the body!
Shouldn't be the new stencil always be centered, because self-alignment-X is 0?
I would expect a different alignment only, if I change the values for
X-offset and/or self-alignment-X myself.


Cheers,
  Harm