RFR: 8369836: Update HeaderBar API [v2]

[Kevin Rushforth]

On Tue, 18 Nov 2025 00:01:24 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> This is pending a discussion on the [mailing list](https://mail.openjdk.org/pipermail/openjfx-dev/2025-November/057431.html).
>
> Thanks. I saw that, but hadn't had time to respond. I'll do that in the next day or two.

As you no doubt saw from my reply, I didn't get to the discussion. Since this is a preview feature, we can leave the resolution of this until later if you want. I like the idea you have in that thread of providing API to return the declaring class rather than relying on convention. So I think it's OK to leave this how you have it.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1936#discussion_r2644447919