RFR: 8370446: Support dialogs with StageStyle.EXTENDED [v2]

[Andy Goryachev]

On Fri, 31 Oct 2025 00:07:46 GMT, Michael Strauß <mstrauss at openjdk.org> wrote:

>> Adds the `DialogPane.headerBar` property, which allows developers to specify a custom `HeaderBar` when the dialog uses the `EXTENDED` stage style.
>
> Michael Strauß has updated the pull request incrementally with one additional commit since the last revision:
> 
>   move HeaderBar to DialogPane

For testing: added the header bar options to the Stage and Dialog pages:
https://github.com/andy-goryachev-oracle/MonkeyTest/tree/dialog.header.bar

Looks nice!

<img width="975" height="543" alt="Screenshot 2025-11-06 at 15 56 35" src="https://github.com/user-attachments/assets/0356b3bb-7c34-4dd2-a318-e61310495ff4" />

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PR Comment: https://git.openjdk.org/jfx/pull/1943#issuecomment-3499882246
PR Comment: https://git.openjdk.org/jfx/pull/1943#issuecomment-3499887605