improve uniqueness.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@5494 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/resources/lib/form/hetero-list.jelly

@@ -23,7 +23,7 @@
       <j:set var="instance" value="${null}" />
       <j:forEach var="descriptor" items="${attrs.descriptors}" varStatus="loop">
         <div name="${attrs.name}" title="${descriptor.displayName}">
-          <input type="hidden" name="kind" value="${loop.index}" />
+          <input type="hidden" name="kind" value="${descriptor.displayName}" />
           <table>
             <st:include from="${descriptor}" page="${descriptor.configPage}" />
           </table>