Linked select widget - does not considers GET parameters in add new URL

[Sovetnikov]

Have running suit with django 1.7 and got a problem with linked select widget.
Link on right side is based on Add new command URL, don't know why, but i have add new URL like http://127.0.0.1:8080/admin/main/marketmember/add/?_to_field=id
and because of it URL for selected object comes like this http://127.0.0.1:8080/admin/main/marketmember/add/?_to_field=id/../3

Linked select JS handler must consider GET parameters in the add new URL.
I have made a fix in suit.js, think it needs to be included in repo:
var get_url = function ($add_link, $select) {
var value = $select.val();
return $add_link.attr('href').substring( 0, $add_link.attr('href').indexOf( "?" ) ) + '../' + value + '/';
};