RFR: 8294589: MenuBarSkin: memory leak when changing skin

[Andy Goryachev]

On Fri, 30 Sep 2022 15:59:32 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> Perhaps the test is too artificial, something is not being done correctly or exactly as in the real application?  Using StageLoader or showControl() hooks up the missing dependencies.
>
>> btw: I would suggest that you believe the test
> 
> Sorry, I trust VisualVM path to GC root.

before:
<img width="939" alt="Screen Shot 2022-09-30 at 09 01 23" src="https://user-images.githubusercontent.com/107069028/193310763-90adba4e-ba88-45d3-9c24-d4b8b6738504.png">

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PR: https://git.openjdk.org/jfx/pull/906