Steps to Reproduce

fiddle:
http://zkfiddle.org/sample/6qdvuv/2-zk-popup-position

Click on the button to open a popup on the target
This also cause the window to fire resize.
When window resize, the location of the popup is calculated by zul.wgt.Popup.prototype.reposition()

Current Result

Popup position is calculated based on it's parent, not based on it's target.

Expected Result

Popup position should be calculated based on target.

Debug Info

https://github.com/zkoss/zk/blob/master/zul/src/archive/web/js/zul/wgt/Popup.js#L408

Root Cause

Following ZK-3606, page-level popup received their target as fake parent (which works under this scenario), however popups with an already existing parent would be positioned incorectly.

Workaround

<script><![CDATA[ 
			zk.afterLoad('zul.wgt', function() {
				var xPopup = {};
				zk.override(zul.wgt.Popup.prototype, xPopup ,{
					reposition: function () {
						var openInfo = this._openInfo;
						//once opened
						if (openInfo) {
							//openInfo: ref, offset, position, opts
							var posInfo = this._posInfo(openInfo[0], openInfo[1], openInfo[2]);
							if (posInfo)
								jq(this.$n()).zk.position(posInfo.dim, posInfo.pos, openInfo[3]);
						}
					}
				});//zk.override
			});//zk.afterLoad
		]]></script>