Problem with double & (ampersand) check_url in forms action

I had this problem when trying to translate a node (with the base translation module)
ex : http://mywebsite.com/fr/node/add/description?translation=77331&language=en
Since the last domain_access update, the form's action was :
<form action="http://mywebsite.com/fr/node/add/description?translation=77331&amp;amp;language=en" accept-charset="UTF-8" method="post" id="node-form" enctype="multipart/form-data">
So the language wasn't retrieved from the get object when submitting

I investigated and found this line in the domain.module file, in the domain_form_alter function line 1503 :
$form['#action'] = check_url($_domain['scheme'] .'://'. $_domain['subdomain'] . $action['path'] . $action['query']);
So there's a double check_url function called by the domain_form_alter and by theme_form (form.inc) functions.
I removed the check_url in the domain_form_alter like in the previous version of domain_access to remove the problem :
$form['#action'] = $_domain['scheme'] .'://'. $_domain['subdomain'] . $action['path'] . $action['query'];

Is there a special reason why the check_url function was added in the last version of domain_access ?