[XeTeX] sporadic shifted underbrace error

[Daniel Greenhoe]

Is the git repository that you are using accessible only to the
unicode-math developers, or to anyone with git software
(http://git-scm.com/ or http://msysgit.github.com/ or ?) installed on
their machine?

On Fri, Feb 8, 2013 at 9:41 PM, Khaled Hosny <khaledhosny at eglug.org> wrote:
> The issue is now fixed in git repository.
>
> Regards,
> Khaled
>
> On Fri, Feb 08, 2013 at 03:48:51AM +0200, Khaled Hosny wrote:
>> Thanks for reproducing the issue. This is clearly an engine bug (unlike
>> old TeX, the over/under braces are handled solely by the engine not
>> constructed by macros).
>>
>> I’ll try to debug this now it is reproducible, but whatever fix I can
>> come up with will not be available before the next XeTeX release (TeX
>> Live 2013), so It won’t solve your immediate problem, sorry.
>>
>> Regards,
>> Khaled
>>
>> On Wed, Feb 06, 2013 at 12:50:17PM +0800, Daniel Greenhoe wrote:
>> > Khaled, thanks for the great suggestion. I used an open type math font
>> > (xits-math.otf) and the problem now shows up multiple times. In the
>> > attached pdf, the shift occurs on pages 3, 8, 9, 10, 19, 21, 23, 28,
>> > 34, ...
>> >
>> > My setup includes these:
>> > \usepackage[no-config,no-math]{fontspec}  % font selection for xelatex
>> > \usepackage{xunicode}                 % unicode character support
>> >  \usepackage{amsmath}                 % AMS math package
>> >  \usepackage{unicode-math}            % unicode math support
>> >  \unimathsetup{math-style=ISO,bold-style=ISO,vargreek-shape=TeX}
>> >  \setmathfont{xits-math.otf}
>> >  \setmathfont[range={\mathcal,\mathbfcal},StylisticSet=1]{xits-math.otf}
>> >
>> > Attached is a tex file and pdf output. Can anyone else reproduce the
>> > errors? Any suggestions?
>> >
>> >   command line:  xelatex underbrace
>> >
>> > Dan
>> >
>> > On Wed, Feb 6, 2013 at 11:43 AM, Khaled Hosny <khaledhosny at eglug.org> wrote:
>> > > I’ve seen this once with OpenType math fonts, but I wasn’t able to
>> > > reproduce it again. Trying using the same fonts in your minimal example,
>> > > since it is probably and OpenType math-only issue.
>> > >
>> > > Regards,
>> > > Khaled
>> > >
>> > > On Wed, Feb 06, 2013 at 11:13:51AM +0800, Daniel Greenhoe wrote:
>> > >> I did make a quick minimal example (but not exactly the same as in the
>> > >> previous email) that uses the underbrace 1000 (?) times. But so far
>> > >> apparently no success in getting the problem to show itself again.
>> > >>
>> > >> If interested, please see attachments.
>> > >>
>> > >> Dan
>> > >>
>> > >>
>> > >> On Wed, Feb 6, 2013 at 10:32 AM, Daniel Greenhoe <dgreenhoe at gmail.com> wrote:
>> > >> > For some time now I have been having *sporadic* problems with
>> > >> > underbraces being shifted to the right by maybe 15mm or so.
>> > >> >
>> > >> > The problem is sporadic---it appears sometimes, but on the next
>> > >> > compile may well have disappeared. The document I am currently working
>> > >> > on contains several hundred pages. I can try to put together a minimal
>> > >> > example...but that may be of limited use since it may be difficult to
>> > >> > get the problem to show itself when I want it to show itself.
>> > >> >
>> > >> > So, before I do that, might anyone have an idea of what might be the problem?
>> > >> >
>> > >> > There is a screen capture of a shift. The right underbrace has been
>> > >> > shifted far to the right. It should be like the underbrace on the
>> > >> > left.
>> > >> >
>> > >> > Here is my current underbrace macro:
>> > >> >
>> > >> > \newcommand{\mcom}[3][c]{\ensuremath{%
>> > >> >   \begin{array}[t]{#1}%
>> > >> >     \underbrace{#2}\\%
>> > >> >     \text{\addfontfeatures{Color=mcom}\scriptsize{#3}}%
>> > >> >   \end{array}%
>> > >> >   }}%
>> > >> >
>> > >> > The color mcom is simply defined liked this:
>> > >> >   \definecolor{mcom}           {cmyk}{0,0,0,1}
>> > >> >
>> > >> > The \mcom macro can be used something like this:
>> > >> >   \[  \mcom{\sin^2(x)+\cos^2(x)=1}{this is a trig. identity} \]
>> > >> >
>> > >> > I am compiling with XeLaTeX from a TeXlive distribution.
>> > >> > Any ideas?
>> > >> > Many thanks in advance,
>> > >> > Dan
>> > >
>> > >
>> > >
>> > >
>> > >
>> > >>
>> > >>
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