[XeTeX] Color in RTL mode

[Vafa Khalighi]

after playing with colors for a while, I came with a trick done in math mode
that allows color spanning multiple lines in RTL mode. so an example is:

 \documentclass{article}

\usepackage{color}

\usepackage[RTLdocument]{bidi}

\begin{document}

${\color{red}\hbox{\vbox{This is a test This is a test This is a test This
is a test This is a test This is a test This is a test This is a test This
is a test This is a test This is a test This is a test test This is a test
}}}$


 This is a test

\end{document}

With this, the color in RTL mode behaves correctly spanning multiple lines.
I think it seems a good idea to improve this. ofcourse with this tricks, I
do not think we could avoid

 Overfull \hbox (15.0pt too wide) in paragraph at lines 5--6

[][]$[][]$ []


But that is not much important. TeX can complain as much as it likes; I do
not care since color issue is fixed.


Any ideas?

-- 
Vafa
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