[FLEX-26308] ListCollectionView addAllAt causes RTE on filtered collections

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: Adobe Flex SDK 4.1 (Release)
• Fix Version/s: Apache Flex 4.12.0
• Component/s: Collections
• Environment: Affected OS(s): All OS Platforms; Affected OS(s): All OS Platforms; Browser: Internet Explorer 8.x; Language Found: English
• Assignee: Justin Mclean
• Reporter: Adobe JIRA
• Created: 21/Dec/10 14:19
• Updated: 24/Feb/14 02:23
• Resolved: 24/Feb/14 02:23

Description

Steps to reproduce:
1.Create an ArrayCollection with multiple items.
2.Apply a filter function that filters all items out.
3.Use the addAll method to add multiple items to the original collection while it's filtered.

Actual Results:
A RangeError saying "Index '1' specified is out of bounds."

Expected Results:
No error and items to all be added to the source list.

Workaround (if any):
Create a for each loop that uses addItem instead.

The problem seems to lie in the ListCollectionView.addAllAt method. It loops over the addList using a for loop and attempts to addItemAt with each one, incrementing the index it adds at. addItemAt throws a RangeError if the index is greater than the length (which will be 0 if the filter applies to all items in the collection) so after the first item is added at index 0, the next item is attempted to be added at index 1 which is greater than the length of 0 and a RangeError is thrown.
Found in the Flex SDK 4.1 release build 16076