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https://issues.apache.org/jira/browse/FLEX-34954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15012590#comment-15012590
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Mark Kessler commented on FLEX-34954:
-------------------------------------
Referenced as the cause of this issue.
> SkinnableTextBase steals focus by callLater(textDisplay.setFocus)
> -----------------------------------------------------------------
>
> Key: FLEX-34954
> URL: https://issues.apache.org/jira/browse/FLEX-34954
> Project: Apache Flex
> Issue Type: Bug
> Components: Spark: TextArea
> Affects Versions: Apache Flex 4.14.1
> Reporter: Konstantin Elstner
> Assignee: Mark Kessler
> Priority: Critical
>
> The support class:
> spark.components.supportClasses.SkinnableTextBase
> has a critical issue in line 1879:
> callLater(textDisplay.setFocus)
> The usage of call later will lead to possible focus losses in case of
> environments with out mouse usage.
> Examples:
> - TextBox added to stage, afterwards a popup / alter is added
> - TextBox is added and removed to / from stage
> - Alert is opened over textbox, alert close will trigger switch to other
> component, but text box will be reactivated for a short moment.
> All this cases will have a critical focus loss.
> Please change in spark.components.supportClasses.SkinnableTextBase
> line 1879 to:
> textDisplay.setFocus();
> By the way:
> A callLater workaround is a bad practice to fix some skin state issues,
> especially only slow computers with possible dropped frames.
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