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https://issues.apache.org/jira/browse/FLEX-33535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13660972#comment-13660972
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Damian Norman commented on FLEX-33535:
--------------------------------------
Am unable to reproduce this bug in a test app, which makes me think there is
something specific to the way we are using TLF in our main app, where I saw the
bug originally, that allows the code to reach this point...
> On resize, null object reference is thrown by non existent prevLine
> TextFlowLine
> --------------------------------------------------------------------------------
>
> Key: FLEX-33535
> URL: https://issues.apache.org/jira/browse/FLEX-33535
> Project: Apache Flex
> Issue Type: Bug
> Components: Spark: TextArea
> Affects Versions: Adobe Flex SDK 4.6 (Release)
> Environment: Mac OS 10.6.8, Flash player 11,3,300,257, Air 3.3, all
> major browsers
> Reporter: Damian Norman
> Fix For: Adobe Flex SDK Next
>
>
> Resizing a Spark TextArea with a TextFlow component's height rapidly, down to
> 0 results in a null object reference. (prevLine at line number 3018 is null)
> Error details:
> Error #1009: Cannot access a property or method of a null object reference.
> at
> flashx.textLayout.container::ContainerController?/http://ns.adobe.com/textLayout/internal/2008::updateCompositionShapes()
> at
> flashx.textLayout.compose::StandardFlowComposer?/updateCompositionShapes() at
> flashx.textLayout.compose::StandardFlowComposer?/updateToController() at
> flashx.textLayout.compose::StandardFlowComposer?/updateAllControllers() at
> flashx.textLayout.container::TextContainerManager?/updateContainer() at
> spark.components::RichEditableText?/updateDisplayList() at
> mx.core::UIComponent/validateDisplayList() at
> mx.managers::LayoutManager?/validateDisplayList() at
> mx.managers::LayoutManager?/doPhasedInstantiation() at
> mx.managers::LayoutManager?/doPhasedInstantiationCallback()
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