Fix vert about unicode-math HOT 5 CLOSED

Couple more details here: using | or \vert is fine, because they're defined as \mathord in the table, but the delimiters need special treatment.

from unicode-math.

A test. With amsmath and unicode-mathloaded:
\newcommand{\tallstuff}{f \left( ∫_{A_{B}}^{C^{D}}!x,dx \right)} % something big
$|\tallstuff|$ % U+007C ‘|’: Vertical Line works, but not scaled; \vert is the same as |
$‖\tallstuff‖$ % Same with U+2016 ‘‖’: Double Vertical Line; \Vert is the same as ‖
$\left\lvert\tallstuff\right\rvert$ % Works, but use CMEX10 font
$\left\lVert\tallstuff\right\rVert$ % Ditto
$\left|\tallstuff\right|$ % Ditto
$\left‖\tallstuff\left‖$ % Breaks with this message:
% ! Missing delimiter (. inserted).
%
% ‖
% l.13 Absolute values: $\left‖
% \tallstuff\right‖$
% ?

from unicode-math.

Fix \vert and \Vert (I think)

closed by 007206c

from unicode-math.

Test for testsuite:
\input{umtest-preamble}
\usepackage{unicode-math}
\setmathfont{Cambria Math}
\begin{document}
[ \left| \left| \left| \left| \left| \left| x^2
\right|^2 \right|^2 \right|^2 \right|^2 \right|^2 \right| ]

\[ \left\vert \left\vert \left\vert \left\vert \left\vert \left\vert x^2 
    \right\vert^2 \right\vert^2 \right\vert^2 \right\vert^2 \right\vert^2 \right\vert \]
\end{document}

from unicode-math.

Thanks :)

from unicode-math.