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From "Stepan Hilbert (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLEX-33913) XMLListCollection addItem(item) modifies a parent XMLList of the item
Date Tue, 19 Nov 2013 04:09:30 GMT
Stepan Hilbert created FLEX-33913:
-------------------------------------

             Summary: XMLListCollection addItem(item) modifies a parent XMLList of the item
                 Key: FLEX-33913
                 URL: https://issues.apache.org/jira/browse/FLEX-33913
             Project: Apache Flex
          Issue Type: Bug
          Components: .Unspecified - Framework
    Affects Versions: Adobe Flex SDK 3.6 (Release), Adobe Flex SDK 4.1 (Release), Apache Flex
4.11.0
         Environment: Reproduced with the SDKs above in FP 11.9 on Windows IE; Likely an issue
in all OS/SDK/FP combinations.
            Reporter: Stepan Hilbert


Sample code:
{noformat}
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" >
	<mx:Script>
		<![CDATA[
			import mx.collections.XMLListCollection;
			import mx.controls.Alert;
			protected var mainXML:XML = 
				<root>
					<item id="1"/>
					<item id="2"/>
					<item id="3"/>
				</root>;
			
			protected function addButton_clickHandler(event:MouseEvent):void
			{
				trace("Length before adding: " + mainXML.item.length()); // traces '3'
				var some:XMLListCollection = new XMLListCollection();
				for each (var o:Object in mainXML.item)	{
					some.addItem(o);
				}
				trace("Length After adding: " + mainXML.item.length()); // traces '5' BUT SHOULD BE STILL
3
			}
		]]>
	</mx:Script>
	<mx:Button label="Add Items" click="addButton_clickHandler(event)" />
</mx:Application>
{noformat}

Result:
mainXML.item XMLList is gets modified - the 2nd and 3rd items are added to it. That shouldn't
happen and can cause very severe issues.

Workaround:
Do not use XMLListCollection. Array or ArrayCollection seem to be unaffected by this bug.

Related Issues:
This issue might share the same underlying cause: FLEX-21831



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