Re: underbraces get progressively more misaligned (w/ minimal example)

From: Hans Hagen <pragma@wxs.nl>
To: Sanjoy Mahajan <sanjoy@MIT.EDU>,
	Wolfgang Schuster <schuster.wolfgang@gmail.com>,
	mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: underbraces get progressively more misaligned	(w/ minimal example)
Date: Fri, 04 Jul 2014 00:09:27 +0200	[thread overview]
Message-ID: <53B5D497.1040108@wxs.nl> (raw)
In-Reply-To: <87a98q40ks.fsf@approx.mit.edu>

On 7/3/2014 11:03 PM, Sanjoy Mahajan wrote:
>> math-stc.mkvi:
>>
>> \unexpanded\def\math_stackers_make_double#top#bottom#category#codepoint#codeextra#text%
>>        ...
>> -     \ifx\currentmathtext\empty
>> +     \ifx\m_math_stackers_text_middle\empty
>>          \setbox\scratchboxthree\emptyhbox
>>        \else
>
> Thanks for looking into this, Wolfgang.
>
> I made this change to math-stc.mkvi in the 2014.05.17 beta, then remade
> the MkIV format with
>
>    mtxrun --selfupdate
>    mtxrun --generate
>    luatools --generate
>    context --make

context --make does a --generate so you can skip that and the luatools 
run is not needed either (selfupdate is seldom needed too)

> Then I ran context on my test file (with 30000 as the \dorecurse count).
>
> However, the offset underbraces remain.  I'm attaching a image from
> p. 2128, by which point the offset is 20 or 30pt.  I am fairly sure I am
> running the newly created version, because remaking the format included
> these lines:
>
>    open source     > 1 > 256 > /home/sanjoy/context/2014.05.17-beta/tex/texmf-context/tex/context/base/math-stc.mkvi
>    loading         > ConTeXt Math Macros / Stackers
>    close source    > 1 > 256 > /home/sanjoy/context/2014.05.17-beta/tex/texmf-context/tex/context/base/math-stc.mkvi
>
> and the log output from running the minimal.tex shows that the the fmt
> is indeed dated 2014.7.3:
>
>    mtx-context     | run 1: luatex --fmt="/home/sanjoy/context/2014.05.17-beta/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luatex/cont-en" --jobname="minimal" --lua="/home/sanjoy/context/2014.05.17-beta/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luatex/cont-en.lui" --no-parse-first-line --c:currentrun=1 --c:fulljobname="./minimal.tex" --c:input="./minimal.tex" --c:kindofrun=1 --c:maxnofruns=8 "cont-yes.mkiv"
>    This is LuaTeX, Version beta-0.79.1 (TeX Live 2014/dev) (rev 4972)
>     \write18 enabled.
>    open source     > 1 > 1 > /home/sanjoy/context/2014.05.17-beta/tex/texmf-context/tex/context/base/cont-yes.mkiv
>
>    ConTeXt  ver: 2014.05.17 23:46 MKIV beta  fmt: 2014.7.3  int: english/english

we get a .5pt height difference somewhere (nothing else different in a 
trace) ... smells like a luatex bug (testing that now)

Hans

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