RFR: 8190264: JScrollBar ignores its border when using macOS Mac OS X Aqua look and feel [v11]

[Alisen Chung]

On Fri, 7 Jan 2022 18:35:17 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

> > The test does not fail for me on the build without the fix. It's confirmed by the image where scroll bar thumb is painted in the border.
> 
> I decided to go ahead and experimented with the test. [My latest version](https://github.com/aivanov-jdk/jdk/blob/7ab9cdae8151dd71c60d752991c3d44dc2d0f76e/test/jdk/java/awt/Scrollbar/AquaLFScrollbarTest/ScrollBarBorderTest.java) is available on GitHub. It should work in headless environment. (I noticed that the test doesn't have `@key headful` where it must have been there.) I added saving the images captured if the test fails, which should help in analyzing the failure.
> 
> This version of the test fails for me on builds without the fix and passes on the build with the fix included. @alisenchung, you can cherry-pick the changes from my branch into yours.
> 
> Probably it's enough to capture only the second image and then check for the color of the border.

Thanks!

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PR: https://git.openjdk.java.net/jdk/pull/6374