[FLEX-22740] Virtualization: Setting rowHeight to zero can cause unexpected behavior

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Later
• Affects Version/s: Adobe Flex SDK 4.0 (Release)
• Component/s: Spark: DataGroup
• Environment: Affected OS(s): All OS Platforms; Affected OS(s): All OS Platforms; Browser: Firefox 3.x; Language Found: English
• Assignee: Adobe JIRA
• Reporter: Adobe JIRA
• Created: 13/Jan/10 16:26
• Updated: 23/Feb/10 15:37
• Resolved: 13/Jan/10 20:20

Description

Steps to reproduce:
1. Compile and run:

<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark">

<s:controlBarContent>
<s:Button label="1. variableRowHeight=false" click="vl1.variableRowHeight=false" />
<s:Button label="2. rowHeight=0" click="vl1.rowHeight=0" />
<s:Button label="3. variableRowHeight=true" click="vl1.variableRowHeight=true" />
</s:controlBarContent>

<s:List id="list1" height="100" width="100">
<s:layout>
<s:VerticalLayout id="vl1" />
</s:layout>
<s:dataProvider>
<s:ArrayList>
<fx:String>one</fx:String>
<fx:String>two</fx:String>
<fx:String>three</fx:String>
<fx:String>four</fx:String>
<fx:String>five</fx:String>
<fx:String>six</fx:String>
<fx:String>seven</fx:String>
</s:ArrayList>
</s:dataProvider>
</s:List>

</s:Application>

2. Click button 1, 2, 3

Actual Results:

First element is not shown.

Expected Results:

First element is shown.

Workaround (if any):