[XeTeX] another bug of bidi.sty

[VAFA KHALIGHI]

$\underline{X}$ gives error because the definition of \underline in bidi.sty
is buggy.

The definition should be:

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\let\@@@underline=\underline
\def\underline#1{%
  \relax
  \ifmmode\@@@underline{#1}%
  \else
\if at rl $\@@@underline{\hbox{\RL{#1}}}\m at th$\relax
\else
$\@@@underline{\hbox{#1}}\m at th$\relax\fi\fi}




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