Hi! Now, I found the bug. In wp-admin/js/widgets.js, line 113:
var add = ui.item.find('input.add_new').val(), n = ui.item.find('input.multi_number').val(), id = ui.item.attr('id'), sb = $(this).attr('id'); 'id' is undefined, because it was removed from ui.item [0][1]. [0] http://bugs.jqueryui.com/ticket/4564 [1] https://github.com/jquery/jquery-ui/commit/98fcb477d6a7091b21e9b7bc0b8c28f798954d47#ui/jquery.ui.draggable.js -- Marcelo Jorge Vieira xmpp:me...@jabber-br.org http://metaldot.alucinados.com
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