Problem presents in Moodle 1.9.16 / 2.0.3 / 2.1.4 / 2.2.1 / 2.3.4 / 2.4.1 / 2.5.1

I use CAS for authentification on my moodle site.
The login process does work.

On the CAS server parameters page, I turned the field "Logout CAS" to 'yes' (to logout from CAS when disconnecting from Moodle).
When I log out (http://mymoodle.site.fr/login/logout.php?sesskey=XXXsJe78oO), Moodle calls the CAS logout page : https://cas.site.fr/logout?url=http%3A%2F%2Fmymoodle.site.fr
Then, because of the url field after "logout?", the CAS logout page calls the web page "http://mymoodle.site.fr"

But since we changed our CAS server with the version 3.4.6, this last redirection does not work anymore and I stay on the page https://cas.site.fr/logout?url=http%3A%2F%2Fmymoodle.site.fr

I read on this phpCAS page (https://wiki.jasig.org/display/CASC/phpCAS+logout), the function phpCAS::logoutWithUrl($url) is deprecated for CAS servers > 3.3.5.

I looked for this function on the moodle code and I found it in the auth/cas/auth.php file. I guess this file is used in the authentification process.

Line 170 : (from moodle 1.9 code but it is the same in 2.x)
170 if ($this->config->logoutcas ) {
171 $backurl = $CFG->wwwroot;
172 $this->connectCAS();
173 phpCAS::logoutWithUrl($backurl);
174 }_

I changed the line 173 with :
173 phpCAS::logoutWithRedirectService($backurl);
and the redirection works again.

May 2011 : http://moodle.org/mod/forum/discuss.php?d=133002 (first post)
January 2012 : http://moodle.org/mod/forum/discuss.php?d=194260 (discuss)
January 2013 : the problem is still there with Moodle 2.3.4 and 2.4.1
August 2013 : the problem is still there in Moodle 2.5.1