RFR: 8247576: Labeled/SkinBase: misbehavior on switching skin

[Jeanette Winzenburg]

On Thu, 19 Nov 2020 12:20:47 GMT, Jeanette Winzenburg <fastegal at openjdk.org> wrote:

> Cleanup of LabeledSkinBase to allow for switching skins
> 
> - removed null check in listener on graphic's layoutBounds
> - added removal of listener in dispose

hmm .. failing windows build, why?

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PR: https://git.openjdk.java.net/jfx/pull/355