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

[Cormac Redmond]

On Fri, 31 Oct 2025 00:48:44 GMT, Michael Strauß <mstrauss at openjdk.org> wrote:

>> Michael Strauß has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   move HeaderBar to DialogPane
>
> I've moved the new API from `Dialog` (which roughly corresponds to a `Stage`) to `DialogPane`, which contains the scene graph of a dialog. All bugs you've found should also be fixed.

@mstr2: Thanks. I've been using this build a lot yesterday and today, and haven't noticed any issues re: alerts/dialogs + HeaderBar usage. Great to have HeaderBar support for dialogs now.

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PR Comment: https://git.openjdk.org/jfx/pull/1943#issuecomment-3476326422