[luatex] bug in RTL typesetting?

[وفا خلیقی]

> What you should do is giving a small example of this in plain TeX, as a lot
> of people on the list don't use LaTeX at all. The best thing would be to
> extract some code from LaTeX to see what's going on when you type
> \begin{equation}xx\end{equation} in LaTeX, and to see where the bug is in
> this code. With this the LuaTeX team will be able to work on the bug.
>
>

No problem. The same issue happens when we do equations in plain TeX (look
at attached files). I do not think this is a vital problem because it can be
solved by macro.
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