[FLEX-26032] Single pixel scrolls can cause visual artifacts

• Type: Bug
• Status: Closed
• Priority: Trivial
• Resolution: Later
• Affects Version/s: Adobe Flex SDK Previous
• Component/s: Spark: Layout
• Environment: Affected OS(s): All OS Platforms; Language Found: English
• Assignee: Adobe JIRA
• Reporter: Adobe JIRA
• Created: 23/Nov/10 16:04
• Updated: 22/Mar/11 17:09
• Resolved: 20/Jan/11 15:55

Description

Steps to reproduce:
1. Compile and run this code:

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark" width="700">

<fx:Script>
<![CDATA[
public function virtualizationItemRendererFunction(item:*):IFactory

{ if (item is DisplayObject) return null; else return new ClassFactory(VR); }

]]
>
</fx:Script>

<fx:Declarations>
<fx:Component className="VR">
<s:ItemRenderer width="24" height="100">
<s:states>
<s:State name="normal"/>
<s:State name="hovered"/>
<s:State name="selected"/>
</s:states>
<s:Rect top="0" left="0" right="0" bottom="0">
<s:fill>
<s:SolidColor color="0xA8C6EE" color.hovered="0xCEDBEF" color.selected="0xCCCCCC" />
</s:fill>
</s:Rect>
<s:Label id="lbl" text="

{data.myItemIndex}

" top="1" left="1" />
</s:ItemRenderer>
</fx:Component>
</fx:Declarations>

<s:controlBarContent>
<s:Button label="set hsp to 1" click="group1.horizontalScrollPosition = 1" />
<s:Button label="set hsp to 0" click="group1.horizontalScrollPosition = 0" />
</s:controlBarContent>

<s:DataGroup id="group1" width="300" height="100" y="50" clipAndEnableScrolling="true" itemRendererFunction="virtualizationItemRendererFunction">
<s:layout>
<s:HorizontalLayout id="hLayout" useVirtualLayout="true" />
</s:layout>
<s:dataProvider>
<s:ArrayList>
<fx:Object myItemIndex="0" />
<s:Button label="1" width="24" height="100" />
<s:Button label="2" width="24" height="100" />
<fx:Object myItemIndex="3" />
<s:Button label="4" width="24" height="100" />
<s:Button label="5" width="24" height="100" />
<fx:Object myItemIndex="6" />
<s:Button label="7" width="24" height="100" />
<s:Button label="8" width="24" height="100" />
<fx:Object myItemIndex="9" />
<s:Button label="10" width="24" height="100" />
<s:Button label="11" width="24" height="100" />
</s:ArrayList>
</s:dataProvider>
</s:DataGroup>

</s:Application>

2. Click "set hsp to 1"
3. Click "set hsp to 0"

Actual Results:

There is a line of pixels at the right boundary of the DataGroup

Expected Results:

No different than at startup of the application when hsp was 0

Workaround (if any):