[XeTeX] sporadic shifted underbrace error

[Khaled Hosny]

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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