RFR: 8313424: JavaFX controls in the title bar [v51]

[Andy Goryachev]

On Fri, 21 Feb 2025 02:44:47 GMT, Michael Strauß <mstrauss at openjdk.org> wrote:

>> Implementation of [`EXTENDED`](https://gist.github.com/mstr2/0befc541ee7297b6db2865cc5e4dbd09) and `EXTENDED_UTILITY` stage style.
>
> Michael Strauß has updated the pull request incrementally with one additional commit since the last revision:
> 
>   remove HeaderButtonOverlay.allowRtl

1. you may want to sync up with the latest master
2. on Windows, the toolbar buttons do not initially appear for EXTENDED and EXTENDED_UTILITY.  (They seem to re-appear after the focus is lost):

![Screenshot 2025-03-10 112110](https://github.com/user-attachments/assets/8967ee2b-0da6-4a5c-9cdf-5347ce3f065f)

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PR Comment: https://git.openjdk.org/jfx/pull/1605#issuecomment-2711462803