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
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