[XeTeX] sporadic shifted underbrace error

Tue Feb 12 04:05:16 CET 2013

>> On Fri, Feb 8, 2013 at 9:41 PM, Khaled Hosny <khaledhosny at eglug.org> wrote:
>> > The issue is now fixed in git repository.
On Sat, Feb 9, 2013 at 6:53 AM, Khaled Hosny <khaledhosny at eglug.org> wrote:
> http://sourceforge.net/p/xetex/code/

This link references http://tug.org/texlive/build.html which lists
Akira Kakuto as the builder for win32. Akira Kakuto apparently
maintains http://w32tex.org/. As of 2013 February 11, the newest file
in that repository is xetex-w32.tar.xz updated 2013 February 11
11:04am. However, in the change log for 2013 February 11 it says
  "(04) xetex-w32.tar.xz
     Update libpoppler (0.22.1).
     A bug in the unicode-math is not fixed, because the fixed one
     contains rather large differences and it is under discussion."

Does this mean that the fix by Khaled did not make it into the latest
win32 binary? Would anyone happen to know when a fixed one might
possibly be available?

Dan

>
> But there are lots of new stuff, so bugs are expected. Use on your own.
>
> Regards,
> Khaled
>
> On Sat, Feb 09, 2013 at 05:15:16AM +0800, Daniel Greenhoe wrote:
>> 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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