RFR: 8341982: Simplify JButton/bug4323121.java [v7]

[Abhishek Kumar]

On Mon, 21 Oct 2024 18:52:14 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

>> The test `javax/swing/JButton/bug4323121.java` contains lots of unused methods.
>> 
>> I removed all the unused methods by extending `MouseAdapter`.
>> 
>> I use `CountDownLatch` to synchronise actions in the test.
>> 
>> The test still verifies `button.getModel().isArmed()` doesn't always return `true` for classes which extend `JButton`. I verified the updated test fails in 1.3.0 and passes in 1.4.0, so the test still reproduces the original problem.
>
> Alexey Ivanov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update summary and error message

LGTM.

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Marked as reviewed by abhiscxk (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/21475#pullrequestreview-2383734800