RFR: 8282270: java/awt/Robot Screen Capture tests fail after 8280861

[Alexey Ivanov]

On Wed, 9 Mar 2022 11:02:08 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

>>> @aivanov-jdk Thanks for re-running the test. Where does this failure come from - Linux or Windows? The saved image's size is correct (400x300 px), but I can't explain the location of the painted area inside it and why it is so small...
>> 
>> It's Linux, Ubuntu 20.10. Neither can I.
>> 
>> I checked the history and the test failed on different hosts, so it could be an intermittent bug in JDK itself.
>> 
>> ~~Shouldn't the image be larger than 400×300? The size of the frame is 400×300 in user's space, the test is running with uiScaleX=3 and uiScaleY=2, therefore the size of the frame should be 1200×600. In some cases, such a size may not fit on the screen.~~ I see these `sun.java2d.win.uiScale{X,Y}` affect Windows only. On Ubuntu, the test runs according to the system settings.
>
>> Shouldn't the image be larger than 400×300? The size of the frame is 400×300 in user's space, the test is running with uiScaleX=3 and uiScaleY=2, therefore the size of the frame should be 1200×600. In some cases, such a size may not fit on the screen.
> 
> This is what happened on Windows:
> ![Captured image on Windows](https://user-images.githubusercontent.com/70774172/157427018-4b7acdb9-145a-426c-888d-8d4be33b0fc0.png)
> 
> The frame didn't fit on the screen. According to the screenshot of the entire screen, the resolution on the host was 1024×768. It can't fit the frame which is larger than screen 1200×600, especially when it is positioned at 83*3=248, 97*2=194.
> 
> This failure has nothing to do with [JDK-8280861](https://bugs.openjdk.java.net/browse/JDK-8280861), it's just a coincidence.

> @aivanov-jdk I added image-saving code to the Linux test `ScreenCaptureGtkTest.java`. Could you please re-run it? As before, it passes my test runs on Ubuntu 20.04.

I added [the code myself](https://github.com/aivanov-jdk/jdk/commits/8282270-screenCapture) and it's scheduled to run on the host where the test failed. I started my branched from [JDK-8280861](https://bugs.openjdk.java.net/browse/JDK-8280861). Let's see what went wrong.

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PR: https://git.openjdk.java.net/jdk/pull/7613