don't use "is" to compare strings

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@18004 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/bootstrap/erp5_xhtml_style/SkinTemplateItem/portal_skins/erp5_xhtml_style/form_dialog.xml

@@ -85,7 +85,7 @@
                       tal:attributes="onChange string:submitAction(this.form,\'Base_doDialog\')">\n
                 <tal:block tal:repeat="action dialog_actions">\n
                   <option tal:attributes="value action/url;\n
-                          selected python: action is current_action and \'selected\' or None"\n
+                          selected python: action == current_action and \'selected\' or None"\n
                           tal:content="action/name"\n
                           i18n:translate="" i18n:domain="ui"></option>\n
                 </tal:block>\n

product/ERP5/bootstrap/erp5_xhtml_style/bt/revision

-452
\ No newline at end of file
+453
\ No newline at end of file