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https://issues.apache.org/jira/browse/FLEX-33708?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13769579#comment-13769579
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Colin Childs commented on FLEX-33708:
-------------------------------------
Alex, yes, that is what I get. I understand that the second refresh resets the
list back to its original state and should return 0,2,1,3. The issue in
question is when trying to call addItemAt() BEFORE the second refresh (after
setting the sort to null). At that point, I would expect the list to return
0,1,2,3. This is how it behaved in Flex 4.6. In Flex 4.10.0, it returns
1,2,3,0. In other words, before calling the second refresh, any calls to
addItemAt() put the item at the end of the list. I suppose this is not a huge
issue and my workaround solved the issue for me, but in my opinion it is a bug
and is counterintuitive. Although, I totally understand the arguments that have
been made and would understand if it is not considered a bug.
> ArrayCollection addItemAt() does not work correctly after removing sort
> -----------------------------------------------------------------------
>
> Key: FLEX-33708
> URL: https://issues.apache.org/jira/browse/FLEX-33708
> Project: Apache Flex
> Issue Type: Bug
> Components: Collections
> Affects Versions: Apache Flex 4.10.0
> Environment: Tested on Windows 7 with AIR simulator and on iPhone 5
> Reporter: Colin Childs
> Labels: ArrayCollection, flex4.10
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> After sorting an ArrayCollection, removing the sort, then adding an item at
> an index always adds it to the end of the list. I ran into this while sorting
> a dropdown alphabetically, then setting the ArrayCollection's sort to null,
> and trying to add something at the top of the list, such as "Select One".
> This works fine in Flex 4.6.
> Here is a simple example (and workaround):
> var col:ArrayCollection = new ArrayCollection();
> col.addItem("1");
> col.addItemAt("2", 0); //works as expected
> col.addItemAt("3", 2); //works as expected
>
> col.sort = new Sort();
> col.refresh();
> col.sort = null;
>
> //workaround:
> //var temp:ArrayCollection = new ArrayCollection(col.toArray());
> //col = temp;
>
> col.addItemAt("0", 0);
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