RFR: 8342508: Use latch in BasicMenuUI/bug4983388.java instead of delay [v3]

[Alexander Zvegintsev]

On Mon, 21 Oct 2024 14:13:44 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

>> Use a `CountDownLatch` in `javax/swing/plaf/basic/BasicMenuUI/4983388/bug4983388.java` instead of delay.
>> 
>> The latch provides a direct way to synchronise EDT and main thread, the test will finish quicker.
>> 
>> I ran the updated test a few times with `JTREG=REPEAT_COUNT=20`, the test always passed in the CI.
>
> Alexey Ivanov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Use method reference to dispose of the frame

Marked as reviewed by azvegint (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/21585#pullrequestreview-2382499192