Looks like ly:text-interface::interpret-markup behaves different for pdf and
svg.
See this test-code:
~~~~
#(define-markup-command (tst layout props)()
(let ((result
(ly:text-interface::interpret-markup layout props "")
;point-stencil
))
(write-me "stencil? " result)
(write-me "X-ext " (ly:stencil-extent result X))
(write-me "Y-ext " (ly:stencil-extent result Y))
(write-me "empty-stencil? " (ly:stencil-empty? result))
result))
\markup \tst
~~~~
Calling a pdf displays:
stencil? #<Stencil>
X-ext (+inf.0 . -inf.0)
Y-ext (+inf.0 . -inf.0)
empty-stencil? #t
For svg:
stencil? #<Stencil>
X-ext (0.0 . 0.0)
Y-ext (0.0 . 0.0)
empty-stencil? #f
A proper fix would likely go for improving ly:text-interface::interpret-markup.
The reported use-case may be possible to fix with a check for string-null? in
fromproperty-markup. If true return an empty stencil.
Though, one would need to check whether other markup-commands return
differently for pdf and svg as well.
---
** [issues:#5011] With `title = ""` SVG output differs from PDF output**
**Status:** Accepted
**Created:** Wed Dec 14, 2016 05:13 PM UTC by Simon Albrecht
**Last Updated:** Wed Dec 14, 2016 05:13 PM UTC
**Owner:** nobody
Reported by Paul Morris.
~~~~
:::TeX
\version "2.19.52"
\header {
% in pdf output, title = "" is the same as title = ##f or no title (no space
is added)
% in svg output they are not the same, "" inserts space but ##f and no title
do not
% seems like the svg behavior should be the same as the pdf behavior
title = ""
% title = ##f
}
\paper {
top-margin = 0 \cm
top-system-spacing.basic-distance = 0
top-system-spacing.minimum-distance = 0
top-system-spacing.padding = 0
}
% staff should be aligned to the top of the page/image
{ \clef bass c1 }
~~~~
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