RFR: 8313424: JavaFX controls in the title bar [v49]

[Michael Strauß]

On Tue, 18 Feb 2025 18:22:58 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> `HeaderButtonOverlay` is not API, it's an internal implementation detail. The javadoc is just informational for future JavaFX developers.
>
> Let me clarify:
> I think the css properties must be listed in `cssref.html` as the component can be styled via CSS.  I don't see the `cssref.html` file modified in this PR.

`cssref.html` is the normative reference for the JavaFX CSS API. `HeaderButtonOverlay` is not API, it can't be styled by developers, it's completely inaccessible, and therefore must not be specified anywhere.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1605#discussion_r1960455562