Re: Setting bidi-paragraph-direction in comint modes

[Chong Yidong <cyd@gnu.org>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Chong Yidong <cyd@gnu.org>
>> Cc: emacs-devel@gnu.org
>> Date: Wed, 15 Feb 2012 08:49:18 +0800
>> 
>> Like I said, it's simply `ls /usr/share/doc'.
>
> You mean, the insertion of the next chunk of text that arrives from
> `ls'?

Yep.

> I didn't look at the insertion itself, I tried the various cursor
> motion commands _after_ the output from `ls' was already in the
> buffer.  Do you see the "crawl" there as well?

Yep.  After inserting about 7000 lines into the *shell* buffer, as
described, press and hold down M-v (or PageUp) for several seconds.
Redisplay freezes, not updating until about two seconds after the key is
released.  Then it updates the screen with the new cursor position.  But
if bidi-paragraph-direction is set to 'left-to-right, the display
updates in real time as I press and hold M-v.

> Can you quantify it?  Like, how much time it takes to insert the first
> 2000 lines vs the last?

Not easily, but it is definitely not my imagination.  You can't
reproduce the problem at all?