bug#9771: 24.0.90; Redisplay problems with control characters

[Eli Zaretskii]

> Date: Tue, 18 Oct 2011 08:56:34 -0400
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 9771@debbugs.gnu.org
> 
> Anyway, this being so, I found a way to optimize a couple of expensive
> loops inside bidi.c for the important special case of a plain L2R text
> in the buffer.  With these optimizations, the bidi redisplay of the
> entire window showing a buffer with 2000 binary nulls is only a few
> milliseconds slower than the unidirectional one.
> 
> I will install those changes later today, after some more testing.

Done (revision 106124 on the trunk).