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 am going to run a bunch of tests and report the results.

The first thing I noticed: 
- using the State Tester tool in the monkey tester, open the stage like so and click on "Iconify" button.
Expected: the stage gets iconified
Observed: the stage, along with the Stage Tester window AND the monkey tester main window gets iconified, then a beep heard, then all windows get restored.

Happens for any Modality setting  other than NONE.
Why is that?

![Screenshot 2025-06-04 at 11 00 11](https://github.com/user-attachments/assets/a6a766db-4854-42c8-8dc4-ffdd44fef5bb)

With this config, clicking on "Enter/Exit Full Screen" button locks up the app without going into the full screen mode.  I was able eventually to get it unstuck, but opening a stage for the second time produced a blank window:

![Screenshot 2025-06-04 at 11 09 58](https://github.com/user-attachments/assets/3f6d6d4b-0a60-4f88-963d-404639b0087e)

once that happens, the application breaks - for example, I cannot change any options in the Stage Tester window.

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PR Comment: https://git.openjdk.org/jfx/pull/1605#issuecomment-2940920610
PR Comment: https://git.openjdk.org/jfx/pull/1605#issuecomment-2940937922