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

[Michael Strauß]

On Tue, 18 Feb 2025 20:21:07 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> It seems we're going in circles here. You want me to specify something which I've repeatedly explained is not API. I can't specify something which is not API.
>
> Are you saying not a single styleable property can be set with an application CSS, only internally?

It's a bit like using deep reflection to access internals. It's technically possible, but explicitly unsupported. Much in the same way, any attempt to style header buttons can stop working at any time (because we're free to change the implementation in any way without prior notice). If we were to even mention the internal structure of `HeaderButtonOverlay`, we'd sign up for all of the compatibility guarantees that users expect from public API.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1605#discussion_r1960564289