RFR: 8350048: Enforce threading restrictions for show and hide methods in Window, Control, and Skin [v3]

[Andy Goryachev]

On Tue, 25 Feb 2025 21:19:16 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> For example, I recommend checking the following:
> MenuBarSkin line 799
> ComboBoxListViewSkin line 199

I think it should be sufficient to mention the exception in the actual methods where the check is done, such as `hide()` and `show()`.

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PR Comment: https://git.openjdk.org/jfx/pull/1717#issuecomment-2688379991