RFR: 8273617: UninitializedDisplayModeChangeTest.java times out on macOS 12 [v2]

[Sergey Bylokhov]

On Fri, 19 Sep 2025 09:27:47 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

>> Test used to timeout even though it seems the test passed..Increased the timeout to a safe value as sometimes it shows elapsed time to timeout > 300secs in macOS in CI and also ensured the wait-time for child process to execute the test is not been waiting endlessly.
>> Also ensured the original display mode is resetted after the test to prevent affecting following tests.
>> 
>> Tried 100 iterations of the fix on all platforms which is ok
>
> Prasanta Sadhukhan has updated the pull request incrementally with one additional commit since the last revision:
> 
>   EDT fix, timeout reduced

>I think you may have missed the point as to why this test is unstable.
>Look at all the code running on the EDT which constructs the UI that should be either not run there or should be in separate calls.

So what exactly is the reason the test is unstable? How does executing all that code in a single invokeAndWait call cause it to hang on only one platform?

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PR Comment: https://git.openjdk.org/jdk/pull/27365#issuecomment-3313801660