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

[Michael Strauß]

On Thu, 6 Nov 2025 23:34:13 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

> This might be a silly question: is there a need for split `HeaderBar`s?

I don't think that this is very useful for `DialogPane`. A dialog is a pretty opinionated control; if users want this level of customization, it's probably better to use use a normal `Stage`.

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PR Comment: https://git.openjdk.org/jfx/pull/1943#issuecomment-3500121183