[FLEX-34727] ArrayList dispatches a CollectionEvent with an invalid "items" array after removeAll()

• Type: Bug
• Status: Closed
• Priority: Trivial
• Resolution: Fixed
• Affects Version/s: Apache Flex 4.13.0
• Fix Version/s: Apache Flex 4.15.0
• Component/s: Collections
• Labels: easyfix easytest
• Environment: Mac OS X 10.9; very likely to affect other operating systems as well
• Assignee: Chris Martin
• Reporter: Tamás Nepusz
• Created: 26/Jan/15 12:32
• Updated: 14/Jun/15 01:12
• Resolved: 14/Jun/15 01:12

Description

Invoking removeAll() on an ArrayList dispatches a CollectionEvent with kind = CollectionEvent.RESET. According to the documentation of the items property of CollectionEvent,

When the kind is CollectionEventKind.REFRESH or CollectionEventKind.RESET, this array has zero length.

The event dispatched from the ArrayList contains a single null item instead, which contradicts the documentation.

The issue can easily be fixed by updating ArrayList#internalDispatchEvent() to treat RESET and REFRESH events specially so the items array of the event is never updated in these cases.