RFR: 8296621: Stage steals focus on scene change [v5]

[Thiago Milczarek Sayao]

On Tue, 6 Dec 2022 14:27:55 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> I still need to do a little more testing, but so far, the fix looks good to me.
> 
> As for the test, I left an inline comment answering your question. More importantly, though, the test doesn't catch the bug. It passes both with and without your fix on all three platforms.

That's odd, It does consistently fail/works for me when I add/remove `requestFocus()`.

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PR: https://git.openjdk.org/jfx/pull/940