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

[Michael Strauß]

On Sat, 21 Jun 2025 21:05:48 GMT, Cormac Redmond <duke 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?

Shorter PRs tend to get more timely reviews. That being said, since it is closely related, I've added the fix to this PR.

-------------

PR Comment: https://git.openjdk.org/jfx/pull/1831#issuecomment-2993788403