RFR: 8313424: JavaFX controls in the title bar (Preview) [v80]

[Andy Goryachev]

On Wed, 4 Jun 2025 14:48:31 GMT, Michael Strauß <mstrauss at openjdk.org> wrote:

>> Implementation of [`StageStyle.EXTENDED`](https://gist.github.com/mstr2/0befc541ee7297b6db2865cc5e4dbd09).
>
> Michael Strauß has updated the pull request incrementally with one additional commit since the last revision:
> 
>   enable preview feature system properties for tests

I've added popup menu to full screen/ minimize/ maximize to the standalone monkey tester, just in case.

I can reproduce the iconify issue with EXTENDED and the following config (by invoking 'iconify' popup menu):

![Screenshot 2025-06-04 at 11 58 16](https://github.com/user-attachments/assets/4dd8d6d3-7db4-4a3a-b4c2-078dd969743c)


Looks like fx _thinks_ it's iconified, but it is not.  (please pull from the standalone monkey tester repo)

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PR Comment: https://git.openjdk.org/jfx/pull/1605#issuecomment-2941107048