Inconsistent drag message in grid with masterdetail

Steps to Reproduce

http://zkfiddle.org/sample/qdkvrc/1-inconsistent-drag-message-with-master-detail

run fiddle
drag 1st row
open detail component (arrow on the left) and drag 1st row again

Current Result

when the detail is closed, the detail text appear first in the drag message
when the detail is open, the detail text appear last in the drag message

Expected Result

The row message should stay consistent regardless of details open status

Debug Info

Root Cause

the detail component position in the row child element list is firstChild when closed and lastChild when opened.
Since the getDragMessage() fonction uses htmlNode.innerText to generate the message, it will display the content of the detail if the detail is 1st (closed) and will not if the detail is last (opened)

Workaround

<script><![CDATA[
zk.afterLoad('zul.grid', function() {
	var xRow = {};
	zk.override(zul.grid.Row.prototype, xRow ,{
		getDragMessage_: function () {
		if (jq.nodeName(this.getDragNode(), 'tr', 'td', 'th')) {
			var n = this.$n('real') || this.getCaveNode(),
				msg = n ? n.innerText || n.textContent || '' : '';
			return msg ? zUtl.encodeXML(msg) : msg;
		}
	}
	});//zk.override
});//zk.afterLoad
 ]]></script>