RFR: 8294589: MenuBarSkin: memory leak when changing skin

[Andy Goryachev]

On Fri, 30 Sep 2022 16:02:11 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> 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">
>
> after:
> <img width="940" alt="Screen Shot 2022-09-30 at 09 01 36" src="https://user-images.githubusercontent.com/107069028/193310795-48b2a72d-aad7-4c36-81d8-740f302fccb7.png">

See https://github.com/andy-goryachev-oracle/Test/blob/main/src/goryachev/apps/LeakTest.java

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