[luatex] [tex-live] Ignored italic correction with lua(la)tex format

Philipp Stephani p.stephani2 at googlemail.com
Thu Oct 6 23:31:38 CEST 2011

2011/10/6 Khaled Hosny <khaledhosny at eglug.org>:
> Hi all,
> After a long night of debugging and hair pulling, I finally found why
> italic correction for OpenType math fonts is ignored in luatex and
> lualatex formats but not in context.
> For some reason not yet clear to me, the setting of catcode to 11 in
> luatex-unicode-letters.tex causes luatex to not apply italic correction
> (might be related to the fact that luatex applies IC selectively).
> This minimal example shows the issues:
> \input luaotfload.sty
> \font\xits={file:xits-math.otf} at 10pt
> \textfont0=\xits
> $$\Umathchar"7"0"1D443\Umathchar"4"0`($$
> \bye
> after commenting the \catcode part in line 18 of
> luatex-unicode-letters.tex and rebuilding the format, italic correction
> is applied.
> I'm not sure what is the proper fix here, though.

LuaTeX explicitly removes italic correction after letters:

            if (is_new_mathfont(cur_f) && get_char_cat_code(cur_c) == 11) {
                *delta = 0;     /* no italic correction in mid-word of
text font */

This seems like a bug to me.

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