RFR: 8370446: Support dialogs with StageStyle.EXTENDED (Preview) [v5]

[Michael Strauß]

On Tue, 18 Nov 2025 16:10:09 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> Running a simple Dialog test that doesn't try to use `HeaderBar` or `StageStyle.EXTENDED` gets a RuntimeException _without_ enabling preview features.

I've updated the code to skip the preview feature check internally. It's still active for the public API.

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PR Comment: https://git.openjdk.org/jfx/pull/1943#issuecomment-3548591203