RFR: 8341978: Improve JButton/bug4490179.java

[Sergey Bylokhov]

On Fri, 11 Oct 2024 16:54:20 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

> At first, I noticed bug4490179.java didn't release mouse button 1, which could affect the following tests.
> 
> I started looking at the test and updated it to use `CountDownLatch` instead of delays.
> 
> @azvegint handled releasing mouse button 1 in https://github.com/openjdk/jdk/pull/19339#discussion_r1609201116.
> 
> The updated version first verifies `mouseButton3Released` event is received and ensures `actionPerformed` is not received at this time.
> 
> Then mouse button is released; this should trigger two events: `mouseButton1Released` and `actionPerformed`. It is verified that these events are received.
> 
> I kept debugging prints, they help understanding which actions lead to which events.
> 
> The updated test reproduces the original, it is easily verified using Java 8; the updated test is stable in CI.
> 
> 
> The `javax/swing/JButton/bug4490179.java` test is also modified in https://github.com/openjdk/jdk/pull/20861, @mrserb, could you take a look? I was going to suggested factoring out the changes to this test from #20861, yet I modified it myself. I realised it when I started creating the PR.

Marked as reviewed by serb (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/21474#pullrequestreview-2374062176