Fix search filter lost

htdocs/admin/mails_templates.php

@@ -606,10 +606,16 @@ if ($resql)
     $i = 0;
 
     $param = '&id='.$id;
+    if ($search_label)             $param.= '&search_label='.urlencode($search_label);
+    if ($search_lang > 0)          $param.= '&search_lang='.urlencode($search_lang);
+    if ($search_type_template > 0) $param.= '&search_type_template='.urlencode($search_type_template);
+    if ($search_fk_user > 0)       $param.= '&search_fk_user='.urlencode($search_fk_user);
+    if ($search_topic)             $param.= '&search_topic='.urlencode($search_topic);
+
     $paramwithsearch = $param;
-    if ($sortorder) $paramwithsearch.= '&sortorder='.$sortorder;
-    if ($sortfield) $paramwithsearch.= '&sortfield='.$sortfield;
-    if (GETPOST('from')) $paramwithsearch.= '&from='.GETPOST('from','alpha');
+    if ($sortorder) $paramwithsearch.= '&sortorder='.urlencode($sortorder);
+    if ($sortfield) $paramwithsearch.= '&sortfield='.urlencode($sortfield);
+    if (GETPOST('from','alpha')) $paramwithsearch.= '&from='.urlencode(GETPOST('from','alpha'));
 
     // There is several pages
     if ($num > $listlimit)