[XeTeX] bidi, math, and amstext

[Vafa Khalighi]

Not a bug. bidi package has a boolean \if at Latin. The boolean should be set
in higher level packages (like polyglossia) to true for non-RTL scripts and
false for RTL scripts. Its initial value is false so that explains the
behaviour.

Therefore

\documentclass{report}
\usepackage{amstext}
\usepackage{bidi}
\makeatletter
\@Latintrue
\makeatother
\begin{document}

V $_{\text{[high, low]}}$

\end{document}

works as expected.

Note: I did not need to load biblatex package unlike you.
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