[XeTeX] why does Latin Modern Mono have some stretch and shrink with XeTeX ?

[Will Robertson]

Hi all,

I'm not able to check this minute, but I wonder if lmmono is being "special-cases" by luaotfload -- would explain the results you're seeing. 

In fontspec if you load it with \setmonofont the stretch and shrink should be forced to zero, but I can agree it would be good to get to the bottom of this. 

Cheers
Will
(Sent from phone; please excuse brevity.) 

> On 25 Jan. 2017, at 04:50, jfbu <jfbu at free.fr> wrote:
> 
> Hi,
> 
> test file
> 
> % Tested with TeXLive 2016, up-to-date.
> 
> % xetex
> \XeTeXtracingfonts=1
> \font\test="[lmmono10-regular.otf]"\test
> 
> % result otherwise with luatex:
> % (I don't know how to load font with luatex without luaotfload.sty)
> %\input luaotfload.sty
> %\font\test=[lmmono10-regular]:\test
> 
> \the\fontdimen2\font
> \quad
> \the\fontdimen3\font
> \quad
> \the\fontdimen4\font
> 
> \nopagenumbers
> \bye
> 
> xetex: 5.25pt 2.625pt 1.75pt
> 
> Requested font "[lmmono10-regular.otf]" scaled 1000
> -> /usr/local/texlive/2016/texmf-dist/fonts/opentype/public/lm/lmmono10-regula
> r.otf
> [1] )
> 
> luatex:5.25pt 0.0pt 0.0pt
> 
> </usr/local/texli
> ve/2016/texmf-dist/fonts/opentype/public/lm/lmmono10-regular.otf>
> 
> % Local variables:
> % TeX-engine: xetex
> % End:
> 
> The stretch and shrink causes issues in code listings.
> 
> This impacts LaTeX now that Unicode engines
> use the Latin Modern fonts in opentype format by
> default with it.
> 
> LaTeX test file:
> 
> \documentclass{article}
> 
> \begin{document}
> \ttfamily
> 
> \the\fontdimen2\font
> \the\fontdimen3\font
> \the\fontdimen4\font
> 
> \fontname\font
> 
> \showoutput
> \thispagestyle{empty}
> \end{document}
> % Local variables:
> % TeX-engine: xetex
> % End:
> 
> xelatex: 5.25pt2.625pt1.75pt  "[lmmono10-regular]:"
> lualatex:5.25pt0.0pt0.0pt     [lmmono10-regular]:
> 
> Best,
> 
> PS: as I don't currently subscribe to the list, could you please
> CC my address if replying thanks.
> 
> Jean-François
> 
> 
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