Merge branch '6088-logout-in-cas-mode-make-a-redirection-error' into '1.4-dev'

Resolve "Logout in cas mode make a redirection error"

See merge request fusiondirectory/fd!899

include/login/class_LoginCAS.inc

@@ -67,7 +67,10 @@ class LoginCAS extends LoginMethod
     /* Reset error messages */
     $message = '';
 
-    // force CAS authentication
+    /* Remove query string from redirection URL to avoid signout loops */
+    phpCAS::setFixedServiceURL(preg_replace('/\?.*$/', '', phpCAS::getServiceURL()));
+
+    /* Force CAS authentication */
     phpCAS::forceAuthentication();
     static::$username = phpCAS::getUser();