# [Dev-luatex] bug 345: Kerning is not perfect in math mode

Hans Hagen pragma at wxs.nl
Sat Mar 13 12:20:52 CET 2010

On 13-3-2010 12:03, Taco Hoekwater wrote:
> Hi,
>
> See http://tracker.luatex.org/view.php?id=345
>
> I've tried to fix this by checking the \catcode of the current
> character for 'new math fons' instead of relying on the font's
> space() fontdimen like TeX82 does.
>
> This fix is based on the assumption that the 'high numbers' won't
> have \catcode 11, so that only the low upright alphabetic characters
> will have the italic correction stripped, and those are exactly the
> ones we want to reach in 'typical' new math input: this nicely covers
> operators that have 'names' like \sin, and any other uses of \rm
> in math mode.
>
> The downside is that this fix will break stuff like
>
> $A {\it forces} B$
>
> but I see no way to tackle that automatically.

can it be solved with extra info that travels with the glyphs? after
all, there are not that many math fonts and we could add extra info
(e.g. using fea files)

Hans

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