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https://issues.apache.org/jira/browse/FLEX-25071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13655092#comment-13655092
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Justin Mclean commented on FLEX-25071:
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Confirmed still an issue in Apache Flex 4.9.1
> removeAll() on a sorted ArrayCollection returns a RangeError: Index '-1'
> ------------------------------------------------------------------------
>
> Key: FLEX-25071
> URL: https://issues.apache.org/jira/browse/FLEX-25071
> Project: Apache Flex
> Issue Type: Bug
> Components: Collections
> Affects Versions: Adobe Flex SDK 4.1 (Release)
> Environment: Affected OS(s): All OS Platforms
> Affected OS(s): All OS Platforms
> Language Found: English
> Reporter: Adobe JIRA
> Labels: easyfix, easytest
>
> We are seeing this bug as well in SDK 4.1. As comments in the original bug
> stated, the internal list is not synchronized with the ArrayCollection.
> We have a DataGrid displaying a collection of objects in an ArrayCollection.
> When we sort the values in the datagrid, we get the error "Index '-1'
> specified is out of bounds" on calls to arrayCollection.removeAll().
> Possibly relevant: had set arrayCollection.disableAutoUpdate() before calling
> removeAll().
> original bug:
> ----------------------------
> Steps to reproduce:
> 1. Create a sorted ArrayCollection
> 2. example: this._mySortedArrayCollection.sort = myAlphaSort;
> 3. populate the array and then remove any valid item with "removeItemAt"
>
> Actual Results:
> RangeError: Index '-1' specified is out of bounds.
> at
> mx.collections::ArrayList/removeItemAt()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\collections\ArrayList.as:358]
> at
> mx.collections::ListCollectionView/removeItemAt()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\collections\ListCollectionView.as:601]
> ...
> The RangError always says "Index '-1'" not matter what index value is
> entered. For example this._mySortedArrayCollection.removeItemAt(7); with
> return the above same RangeError saying "Index '-1'"
> Expected Results:
> The item at the selected index should be removed from the ArrayCollection
>
> Workaround (if any):
> None
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