RFR: 8169468: NoResizeEventOnDMChangeTest.java fails because FS Window didn't receive all resizes! [v3]

[Sergey Bylokhov]

On Wed, 10 Nov 2021 05:35:12 GMT, Alexander Zuev <kizune at openjdk.org> wrote:

>> I was able to reproduce this issue locally 2 times out of 100 runs on multi-monitor
>> configuration. Both times due to the screen resolution change is so slow window got
>> accidentally moved to the secondary screen by the display driver.
>> Can not reproduce this bug with ATI card at all.
>> Since there is nothing we can do to stop graphics driver from reassigning
>> the window if it decides that promary monitor is not on at the moment the
>> only way is to check if this has had happened and if so then we can not trust the test
>> since we changing resolution of one display and window not getting resized
>> because it is placed on another display and test should be skept.
>> 
>> After that i ran this test locally about a thousand times on all platforms
>> and has not seen the failure again.
>
> Alexander Zuev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Added speel for 2 seconds after setting new display mode.
>   Removed unneeded imports.

Marked as reviewed by serb (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/6186