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Setting bidi-paragraph-direction in comint modes

From: Chong Yidong
Subject: Setting bidi-paragraph-direction in comint modes
Date: Tue, 14 Feb 2012 14:35:52 +0800

Any objections to setting bidi-paragraph-direction to `left-to-right' in
Comint and derived modes?  The bidi code appears to lead to a
performance regression.  You can observe this with

1. emacs -Q
2. M-x shell RET
3. ls /usr/share/doc    (Prints about 2000 lines on my computer)
4. Repeat step 3 many times.

As the buffer gets to about 8000 lines, redisplay slows to a crawl.
Setting bidi-paragraph-direction to `left-to-right' fixes this (mostly;
it's still a touch slower than in Emacs 23).  AFAICT, bidi paragraphs
don't make sense in Comint-like modes anyway.

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