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https://issues.apache.org/jira/browse/PIVOT-311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12762151#action_12762151
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Todd Volkert commented on PIVOT-311:
------------------------------------

Actually, this happens even if you move back over the display host's bounds 
after moving out.

> Exception in Mouse.release when released outside the display host's bounds
> --------------------------------------------------------------------------
>
>                 Key: PIVOT-311
>                 URL: https://issues.apache.org/jira/browse/PIVOT-311
>             Project: Pivot
>          Issue Type: Bug
>          Components: wtk
>    Affects Versions: 1.3
>            Reporter: Todd Volkert
>             Fix For: 1.4
>
>
> Steps to reproduce:
> 1) Launch the kitchen sink tutorial app in desktop application context
> 2) Expand the "Tables" section
> 3) Drag the resize handle of the first column to the left until your mouse is 
> outside the bounds of the host frame entirely.
> 4) Release the mouse
> Result:
> java.lang.NullPointerException
>       at org.apache.pivot.wtk.Mouse.release(Mouse.java:119)
>       at 
> org.apache.pivot.wtk.skin.terra.TerraTableViewHeaderSkin.mouseUp(TerraTableViewHeaderSkin.java:689)
>       at 
> org.apache.pivot.wtk.Component$ComponentMouseButtonListenerList.mouseUp(Component.java:465)
>       at org.apache.pivot.wtk.Component.mouseUp(Component.java:2566)
>       at 
> org.apache.pivot.wtk.ApplicationContext$DisplayHost.processMouseEvent(ApplicationContext.java:872)
>       at java.awt.Component.processEvent(Component.java:6028)
>       at 
> org.apache.pivot.wtk.ApplicationContext$DisplayHost.processEvent(ApplicationContext.java:653)
>       at java.awt.Component.dispatchEventImpl(Component.java:4630)
>       at java.awt.Component.dispatchEvent(Component.java:4460)
>       at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
>       at 
> java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
>       at 
> java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
>       at 
> java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
>       at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
>       at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
>       at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

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