On 8/13/2023 9:08 AM, Xavier B. wrote:
So,
Finally is it a bug in MKIV? It seems you fix some kind of bug in your
messages. Is it true?
Not really. It's a a bug in the fonts (that will stay if only for
compaibility reasons). There is a catch in mkiv that compensates for it
but only when characters are not there. So, for these two I now force
the catch.
In lmtx we have a bit different approach: we just assuem they are wrong
in all fonts and fix them or replace them. We also have a more advanced
math engine so we can control placement better.
There are also 'font parameters' involved that can be bad (i guess that
designers can't really test math font parameters). In lmtx we have more
of them, beyond what opentype math provides.
All of this is handled in goodie files. That mechanism is present in
mkiv but no one ever bothered to spent time on it. That said: the last
two years Mikeal and I spent a *lot* of time on math and we don't really
look back at mkiv / mkii also because there is way more neat things now
(most probably go unnoticed) ... you can read about it in some documents
that come with context, articles in tugboat, and there are talks by
Mikael at tug meetings on YT.
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.
It's not that hard to install lmtx alongside. If distributions take from
texlive then likely you also end up with files that are not needed (base
package) and lack some fonts (esp math) by default. You'd also benefit
from the last couple of years advancements. Keep in mind that for a long
term tex (document) project a snapshot approach is healthy because you
never know what a distribution adds / replaces (esp fonts can be a mess
and you want to know what you use).
Hans
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Hans Hagen | PRAGMA ADE
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