Steps to Reproduce

Run fiddle:

https://zkfiddle.org/sample/194i5tp/2-Another-new-ZK-fiddle

Scroll down until you located the item with the label "Item-44" (about 2 scrolls from the bottom)

Click on the item.

This trigger a TreeModel onDataUpdate event, causing the treeRow to update.

Treerow update is sent with the response (rm orignal row, addBfr with the new row data)

Current Result

Row is not updated

Old row is still in place, but has no behaviors

Expected Result

Old row is removed, new row is added

Debug Information

caused by:

the parent of item-44 is "item-4"

when item-44 is in view, item-4 is out of the ROD viewport, and is currently not rendered.

this causes treeitem.parent.parent.desktop to be null at this stage

Since the parent treeitem desktop is null, the treeitem is not removed, and the new item is not inserted properly, causing unsync with the server state

Workaround

disable client-rod for tree

<custom-attributes org.zkoss.zul.client.rod="false"/>