RFR: 8190264: JScrollBar ignores its border when using macOS Mac OS X Aqua look and feel [v3]

[Alisen Chung]

On Mon, 15 Nov 2021 17:33:09 GMT, Alisen Chung <achung at openjdk.org> wrote:

>> Adjusted the AquaLF scrollbar to account for border inset settings when dragging the thumb and clicking on the track.
>
> Alisen Chung has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - removed trailing whitespace
>  - test change

@prrace @azuev-java please review

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