On Fri, Apr 17, 2015 at 05:07:31PM +0200, Frédéric Wang wrote: > Hi all, > > Here is a testcase with a dev version of GNUFreeFont: > http://fred-wang.github.io/MathFonts/GNUFreeFont/ > > As I understand, stretchy U+2F/U+2211/U+27E8/U+27E9 do not have a "glue" > so we connect them using a rule
AFAIK, The only times TeX (and by extension OpenType math implemenation) use rules is for radical and fraction bars, everything else is done using glyph variants and/or repeatable parts. If the font does not provide the required glyphs no stretching happens. Regards, Khaled
