[luatex] Delimiters don't grow with \overwithdelims

[ulrik.vieth at arcor.de]

Now that you mention it, I recall that \overwithdelims had some 
problems mapping OpenType parameters to TeX parameters.

See the section about DelimitedSubFormulaMinHeight in my paper 
about OpenType font dimensions:

https://www.tug.org/members/TUGboat/tb30-1/tb94vieth.pdf
http://www.ntg.nl/maps/38/03.pdf

My connclusion was the following:

In the absence of a better solution, it may be best to simply 
avoid using \atopwithdelims with OpenType math fonts 
in the new TEX engines and to redefine userlevel macros 
(such as \choose) in terms of \left and \right delimiters.

Regards, Ulrik


----- Original Nachricht ----
Von:     Khaled Hosny <khaledhosny at eglug.org>
An:      "General discussion of LuaTeX." <luatex at tug.org>
Datum:   15.07.2010 08:12
Betreff: [luatex] Delimiters don't grow with \overwithdelims

> The parenthesis don't grow in this example:
> 
>  \input luaotfload.sty
>  \font\test={name:XITS Math:mode=base;script=math} at 10pt
> %\font\test="[xits-math.otf]:script=math" at 10pt % for xetex
>  \textfont0=\test
>  
>  $$ a \overwithdelims() b $$
>  \bye
> 
> -- 
>  Khaled Hosny
>  Arabic localiser and member of Arabeyes.org team
>  Free font developer
>