RFR: 8169468: NoResizeEventOnDMChangeTest.java fails because FS Window didn't receive all resizes! [v2]

[Sergey Bylokhov]

On Mon, 8 Nov 2021 22:32:59 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:
> 
>   Check that setting the new display mode ended up with window
>   residing on the screen with resolution different than one it was before,
>   even if it the different display - window and components still have to
>   receive the resize event. Only skipping the iteration where that did not
>   happened instead of skipping the entire test.

test/jdk/java/awt/FullScreen/NoResizeEventOnDMChangeTest/NoResizeEventOnDMChangeTest.java line 158:

> 156:                                 Frame f = fsWin instanceof Frame ? (Frame) fsWin : (Frame) fsWin.getOwner();
> 157:                                 DisplayMode oldMode = f.getGraphicsConfiguration().getDevice().getDisplayMode();
> 158:                                 gd.setDisplayMode(dm1);

probably it will be good to add a delay here? What is the longest display switch on the system where the bug is reproduced? a few seconds?

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