Steps to Reproduce

http://zkfiddle.org/sample/339u6gg/2-pop-in-no-dom-dom-tree-bug
run fiddle
each click on the changepp button will refresh the apply tag and cause a new no-dom and popup to be added to the page.

Current Result

The popup is added after the rest of the siblings in his container, thus it is created after the no-dom end tag.
When the no-dom is removed, it removes the content between the start and end tags, but the popup is not there, so it is not removed.

This cause duplicated nodes with duplicated UUIDs to pile up and cause additional issues down the line (fail to invoke, fail to bind, duplicate uuid)

Expected Result

Popup should be working as normal inside a no-dom holder

Debug Info

<div id="zEyP0" class="z-div"> <button type="button" id="zEyP1" class="z-button">change pp</button> <span id="zEyP2" class="z-label">aaaaaaaa</span><div id="zEyP5" style="display:none"></div><div id="zEyP9" style="display:none"></div><div id="zEyP5" style="display:none"></div><div id="zEyPd" style="display:none"></div><div id="zEyP9" style="display:none"></div> <a id="zEyPb" class="z-a" href="javascript:;">link</a>
<!--z-nodom zEyPc start-->
<!--z-nodom zEyPc end-->
<div id="zEyPd" style="display:none">
</div>
</div>

Root Cause

Combination of VParent / popup ghost position / nodom workflow
https://github.com/zkoss/zk/blob/65d556f9261159293f7a40db62aa2f9ea29d542e/zk/src/archive/web/js/zk/dom.js#L1717

Workaround

use div instead of nodom