RFR: 8351357: Add canary system test checking if Stage receives focus on show

[Kevin Rushforth]

On Tue, 17 Jun 2025 14:46:08 GMT, Martin Fox <mfox at openjdk.org> wrote:

>> Perhaps we ought to have a utility (latch?) to ensure the sequence?
>
> A delay of some sort is necessary to give the event loop time to process the event.

Right. I think Andy was suggesting a latch (with a timeout) that would be triggered (counted down to 0) when the event was received. This would also remove the concern I raised about the flag not being volatile.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1804#discussion_r2152546804