[FLEX-34634] DataGroup fires RendererExistenceEvent with a null renderer when an offscreen item is removed/replaced in the dataProvider

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: Apache Flex 4.13.0
• Fix Version/s: Apache Flex 4.14.0
• Component/s: Spark: DataGroup
• Labels: eastyest easyfix
• Assignee: Erik de Bruin
• Reporter: Gareth Daniel Smith
• Created: 10/Nov/14 15:41
• Updated: 18/Nov/14 09:38
• Resolved: 18/Nov/14 08:26

Description

To me this looks like a bug in DataGroup.

It looks like a fairly easy fix. I think a null check is needed around the dispatchEvent call at: https://github.com/apache/flex-sdk/blame/930b545e0cfad5c7ae8f08cd29e21a144d08227b/frameworks/projects/spark/src/spark/components/DataGroup.as#L1766

I will attach a test case.