Re: Empty markup lines behavior change (maybe regression) in dev (2.21.7) than stable (2.20.0)

[Aaron Hill]

On 2020-10-07 8:20 pm, Andrew Bernard wrote:
> If you use { " " } you will get a blank line, in 2.21.6. I don't know 
> about
> other versions, I only use one.

Something else must be going on, as I cannot reproduce the claimed 
behavior.

I am seeing consistently that \line { "" } results in an empty-stencil:

%%%%
\version "2.18.2"
#(format #t "\nversion=~s" (ly:version))
#(define-markup-command
  (measure layout props arg)
  (markup?)
  (let* ((sten (interpret-markup layout props arg))
         (xex (ly:stencil-extent sten X))
         (yex (ly:stencil-extent sten Y)))
    (format #t "\narg=~s\n\txex=~s\n\tyex=~s" arg xex yex)
    sten))
\markup \measure \line { "" }
\markup \measure \line { " " }
\markup \measure \column { \line { "" } \line { "" } }
\markup \measure \column { \line { " " } \line { " " } }
%%%%

====
version=(2 18 2)
arg=(#<procedure line-markup (layout props args)> (""))
        xex=(+inf.0 . -inf.0)
        yex=(+inf.0 . -inf.0)
arg=(#<procedure line-markup (layout props args)> (" "))
        xex=(0.0 . 0.614579527559055)
        yex=(0.0 . 0.0)
arg=(#<procedure column-markup (layout props args)> ((#<procedure 
line-markup (layout props args)> ("")) (#<procedure line-markup (layout 
props args)> (""))))
        xex=(+inf.0 . -inf.0)
        yex=(+inf.0 . -inf.0)
arg=(#<procedure column-markup (layout props args)> ((#<procedure 
line-markup (layout props args)> (" ")) (#<procedure line-markup (layout 
props args)> (" "))))
        xex=(0.0 . 0.614579527559055)
        yex=(-3.0 . 0.0)
====

Same output for:

version=(2 19 55)
version=(2 20 0)
version=(2 21 6)


-- Aaron Hill