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

Looks like the problems are caused by changes in this PR (maybe recent changes since I did not see these issues before).

The test app is difference since we don't have the stage tester tool in the master branch, but one can use the standalone monkey tester

https://github.com/andy-goryachev-oracle/MonkeyTest

which has a Stage page.  Use iconify/full screen checkboxes to replicate the abovementioned scenarios, and it seems to work correctly in the master branch:

![Screenshot 2025-06-04 at 11 25 29](https://github.com/user-attachments/assets/b87ce9c8-a271-4e25-abef-3f7e40952734)

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PR Comment: https://git.openjdk.org/jfx/pull/1605#issuecomment-2940999432