bug#16594: 24.3.50; very slow redraw when resizing windows horizontally

[Darren Hoo]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Darren Hoo <darren.hoo@gmail.com>
>> Cc: Stefan Monnier <monnier@iro.umontreal.ca>,  16594@debbugs.gnu.org
>> Date: Fri, 31 Jan 2014 02:57:58 +0800
>> 
>> In case I have not described my problem precise enough, maybe this
>> screencast I take will clear things up a bit:
>> 
>> http://blog.glib.cc/resize.html
>
> I see nothing of the kind on my system.  Moreover, what you show
> doesn't look like an Emacs redisplay problem, but rather like some
> low-level redraw problem.

indeed, it seems that this redisplay_internal is problematic:

profile.png
Description: redisplay_internal