bug#11047: 24.0.94; Hangs when creating buffer starting with multiple spaces and there exists buffers with multiple spaces

[Eli Zaretskii <eliz@gnu.org>]

> From: Charles Magid <cmmagid@gmail.com>
> Date: Tue, 20 Mar 2012 09:37:11 -0400
> 
> 1. Started emacs on mac os x lion 10.7.3
> 2. Started shell M-x shell
> 3. Created buffer with very long text name starting with 4 spaces
>    c-x b c-q spc c-q spc c-q spc c-q spc Now, start the server and you are ready to sign in and sign out. You can also block user access in any controller by calling authenticate_user! in a before filter. Just remember that, if you add the filter to your application controller, remember to skip the filter on the sessions controller, otherwise you won’t be able to sign in in the first place.
> 4. confirm with a 'return'
> 5. Repeat with slightly more spaces and complex buffer name
>     c-x b c-q spc c-q spc c-q spc c-q spc c-q spc c-q spc You can now freely proceed to implement the other controllers and views in your application. Keep in mind that if you have devise :recoverable in your model, all the related methods like User.send_reset_password_instructions will already be available in your model, so you can use them straight away to implement your own reset password feature. Since Devise use all those methods internally, if you have any questions about implementing your own reset password feature, you can always take a look at Devise own controllers for some help.
>      confirm by 'return'
>  6. Emacs hangs using ~100% of cpu

FWIW, I cannot reproduce this on MS-Windows with yesterday's trunk.
Emacs doesn't hang for me after doing all these steps.