[NTG-context] underbraces get progressively more misaligned (w/ minimal example)

Wolfgang Schuster schuster.wolfgang at gmail.com
Thu Jul 3 21:21:55 CEST 2014

Am 03.07.2014 um 12:49 schrieb Sanjoy Mahajan <sanjoy at 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?


      \edef\m_math_stackers_text_middle {#text}%
-     \ifx\currentmathtext\empty
+     \ifx\m_math_stackers_text_middle\empty


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