RFR: 8313424: JavaFX controls in the title bar [v41]

[Michael Strauß]

On Mon, 27 Jan 2025 22:57:37 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:
> 
>   hide default window buttons on macOS

Another change is the option to use multiple header bars, which now cooperate gracefully. This enables application developers to create advanced layouts, for example having two header bars in a `SplitPane`, where each `HeaderBar` has a different background.

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PR Comment: https://git.openjdk.org/jfx/pull/1605#issuecomment-2617139790