Index: trac/htdocs/js/query.js
===================================================================
--- trac/htdocs/js/query.js	(revision 8664)
+++ trac/htdocs/js/query.js	(working copy)
@@ -229,7 +229,7 @@
       tbody = tbody.parents("tbody").eq(0);
       var copy = tbody.clone(true);
       $(button).closest("td").next().attr("colSpan", 4).end().remove();
-      $("td.trac-clause-sep", copy).parent().removeAttr("style");
+      $("tr:first", copy).removeAttr("style");
       $("tr tbody:not(:last)", copy).remove();
       var newId = "add_filter_" + clauseNum;
       $("select", copy).attr("id", newId).attr("name", newId)