RFR: 8359601: Fix window button states of an extended stage [v3]

[Cormac Redmond]

On Tue, 17 Jun 2025 00:54:12 GMT, Michael Strauß <mstrauss at openjdk.org> wrote:

> I've filed another ticket for that: [JDK-8359763](https://bugs.openjdk.org/browse/JDK-8359763).

Just curious, why a separate bug for this instead of fixing in this PR and avoiding the headaches/conversations of more PRs -- is it more complicated that it sounds?

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PR Comment: https://git.openjdk.org/jfx/pull/1831#issuecomment-2993771128