Am 03.07.2014 um 12:49 schrieb Sanjoy Mahajan <san...@mit.edu>:
> I thought the problem might lie with the general
> \definemathunderextensible (math-stc.mkvi), because underbrace is
> defined as
>
> \definemathunderextensible [vfenced] [underbrace] ["FE3DF] %
> ["023DF]
>
> Other underextensibles include \underbar:
>
> \definemathunderextensible [vfenced] [underbar] ["FE33F]
> % ["203E]
>
> So I tried my example replacing \underbrace with \underbar but the
> alignment comes out fine (and \overbrace works fine too). So that
> debugging idea didn't work, except to indicate that something special
> about underbrace isn't working right.
>
> Does anyone have suggestions for further debugging ideas?
math-stc.mkvi:
\unexpanded\def\math_stackers_make_double#top#bottom#category#codepoint#codeextra#text%
{\begingroup
\edef\currentmathstackers{#category}%
\mathstackersparameter\c!left\relax
\ifmmode\math_class_by_parameter\mathstackersparameter\else\dontleavehmode\fi
{\edef\currentmathstackers{#category}%
\edef\m_math_stackers_text_middle {#text}%
%
...
%
- \ifx\currentmathtext\empty
+ \ifx\m_math_stackers_text_middle\empty
\setbox\scratchboxthree\emptyhbox
\else
\setmathtextbox\scratchboxthree\hbox{\math_stackers_middletext}%
\fi
...
\fi}%
\mathstackersparameter\c!right\relax
\edef\p_limits{\mathstackersparameter\c!mathlimits}%
\ifx\p_limits\v!yes
\expandafter\endgroup\expandafter\limits
\else
\expandafter\endgroup
\fi}
Wolfgang
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