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

[Hans Hagen <pragma@wxs.nl>]

On 7/4/2014 6:58 AM, Wolfgang Schuster wrote:
>
> Am 04.07.2014 um 00:51 schrieb Hans Hagen <pragma@wxs.nl
> <mailto:pragma@wxs.nl>>:
>
>> On 7/4/2014 12:37 AM, Sanjoy Mahajan wrote:
>>>> context --make does a --generate so you can skip that and the luatools
>>>> run is not needed either (selfupdate is seldom needed too)
>>>
>>> So 'context --make' is all one needs?  I'll update the wiki.
>>>
>>>> we get a ..5pt height difference somewhere (nothing else different in a
>>>> trace) .... smells like a luatex bug (testing that now)
>>>
>>> That is my suspicion as well.  But I couldn't reproduce it with plain
>>> luatex.  Though maybe I needed to use equation numbers, however that is
>>> done in plain tex (the context run doesn't show the problem without the
>>> \placeformula).
>>>
>>> I suspect some internal state is getting slightly corrupted and getting
>>> progressively worse with the 30,000 repetitions.
>>
>> here it happens after a pagebreak (a few lines overflow are ok)
>
> It does also depend on the width of the text because when I use 48pt in
> the example below
> the height of the brace is always the same but with 49pt the height
> increases after the first page.
>
> \starttext
>
> \dorecurse{100}
>    {\startformula
>     \mathord
>
>   {%\setbox\scratchbox\mathstylehbox{\Umathaccent\fam\zerocount"FE3DF{\hskip48pt}}%
>
> \setbox\scratchbox\mathstylehbox{\Umathaccent\fam\zerocount"FE3DF{\hskip49pt}}%
>        \the\userpageno:\the\ht\scratchbox}%
>     \stopformula}
>
> \stoptext

\starttext

\dorecurse{1000}
   {\setbox\scratchbox\hbox{$\Umathaccent\fam\zerocount"FE3DF{\hskip49pt}$}%
    \the\ht\scratchbox\par}

\stoptext

that was the one i used when seeing some trigger from the page break 
(the two at the top of page 2 are the overshoot before tex triggers the 
page)

Hans

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