[NTG-context] Re: Why overbar is so big

[Mikael Sundqvist <mickep@gmail.com>]

Hi,

On Sun, Aug 13, 2023 at 9:13 AM Xavier B. <somenxavier@posteo.net> wrote:
>
> So,
>
> Finally is it a bug in MKIV? It seems you fix some kind of bug in your messages. Is it true?
>
> >     The output with Luametatex is correct but Luatex creates a raised bar
> >     (and different linebreaking).
> >
> > \showglyphs
> >
> > \startTEXpage[offset=1ex]
> >      \ruledhbox{$\overline    {OA} = \overbar      {OA} = 4.2$}
> >      \par
> >      \ruledhbox{$\underline   {OA} = \underbar     {OA} = 4.2$}
> >      \par
> >      \ruledhbox{$\widetilde   {OA} = \widebar      {OA} = 4.2$}
> >      \par
> >      \ruledhbox{$\overbracket {OA} = \underbracket {OA} = 4.2$}
> > \stopTEXpage
> >
> > I'll add a 'force fix in spite of extensible being present' in mkiv. In
> > lmtx we always fix also because we drop in nicer shapes (watch the round
> > tips in lm and fancy tips in antykwa) and concluded that fonts will
> > remain as they are.
> >
> > Hans
>
> As you suggested, I will give a try to LMTX but be aware most user still use MKIV until most distros upgrade the texlive version of context to LMTX.
>
> Regards,
> Xavier

One can also try to instead use the accent mechanism instead of a stacker:

% engine=luatex

\definemathtopaccent[widebar] ["0305]

\startTEXpage[offset=3pt]
$\overbar{OA}$

$\widebar{OA}$
\stopTEXpage

The \widebar is defined (almost) like that in lmtx.

/Mikael
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