bug#10835: 24.0.93; bidi-paragraph-direction slows down Shell mode

[Chong Yidong]

Chong Yidong <cyd@gnu.org> writes:

> http://lists.gnu.org/archive/html/emacs-devel/2012-02/msg00517.html
>
> 1. emacs -Q
> 2. M-x shell RET
> 3. ls /usr/share/doc    (Prints about 2000 lines on my computer)
> 4. Repeat step 6-7 times (e.g. M-p RET)

To follow up on some questions from the thread:

> I see nothing like that, the display never freezes.  Strange.  What
> kind of CPU do you have there?  Is it a GUI session or a TTY session?
> Does Emacs run on the local machine or remote one?

It happens on both GUI sessions and TTY, run locally on an Intel i7
processor; Emacs was compiled without optimizations.