[FLEX-28629] Setting selectedItem to null value in Spark List causes error when data provider is a sorted ListCollectionView

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Cannot Reproduce
• Affects Version/s: Adobe Flex SDK Previous
• Component/s: Spark: List
• Environment: Affected OS(s): All OS Platforms; Affected OS(s): All OS Platforms; Language Found: English
• Assignee: Adobe JIRA
• Reporter: Adobe JIRA
• Created: 27/Sep/11 06:41
• Updated: 28/Sep/11 13:44
• Resolved: 28/Sep/11 13:42

Description

A spark list using a sorted ArrayCollection (or any class that extends from ListCollectionView) throws an error if the selectedItem property is set to null.

Steps to reproduce:
1. Compile the attached Main.mxml application
2. Click the button "Select null"

The stack trace of the resulting error is:

TypeError: Error #2007: Parameter string1 must be non-null.
at flash.globalization::Collator/compare()
at spark.globalization.supportClasses::CollatorBase/compare()[E:\dev\hero_private\frameworks\projects\spark\src\spark\globalization\supportClasses\CollatorBase.as:620]
at spark.collections::SortField/stringCompare()[E:\dev\hero_private\frameworks\projects\spark\src\spark\collections\SortField.as:874]
at spark.collections::Sort/internalCompare()[E:\dev\hero_private\frameworks\projects\spark\src\spark\collections\Sort.as:918]
at spark.collections::Sort/findItem()[E:\dev\hero_private\frameworks\projects\spark\src\spark\collections\Sort.as:621]
at mx.collections::ListCollectionView/http://www.adobe.com/2006/flex/mx/internal::findItem()[E:\dev\hero_private\frameworks\projects\framework\src\mx\collections\ListCollectionView.as:1172]
at mx.collections::ListCollectionView/getItemIndex()[E:\dev\hero_private\frameworks\projects\framework\src\mx\collections\ListCollectionView.as:652]
at spark.components.supportClasses::ListBase/commitProperties()[E:\dev\hero_private\frameworks\projects\spark\src\spark\components\supportClasses\ListBase.as:925]
at spark.components::List/commitProperties()[E:\dev\hero_private\frameworks\projects\spark\src\spark\components\List.as:1069]
at mx.core::UIComponent/validateProperties()[E:\dev\hero_private\frameworks\projects\framework\src\mx\core\UIComponent.as:8209]
at mx.managers::LayoutManager/validateProperties()[E:\dev\hero_private\frameworks\projects\framework\src\mx\managers\LayoutManager.as:597]
at mx.managers::LayoutManager/doPhasedInstantiation()[E:\dev\hero_private\frameworks\projects\framework\src\mx\managers\LayoutManager.as:813]
at mx.managers::LayoutManager/doPhasedInstantiationCallback()[E:\dev\hero_private\frameworks\projects\framework\src\mx\managers\LayoutManager.as:1180]

A workaround is to set the selectedIndex property to -1 instead of using the selectedItem property.