RFR: JDK-8016524: [macosx] Bottom line is not visible for JTableHeader [v5]

[Prasanta Sadhukhan]

On Mon, 7 Feb 2022 08:56:26 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

>> @prsadhuk The fix and test case is ready for review. I have marked the testcase as mac-only.
>
> I see it fails for me in mac 10.15..DId you see it pass locally for you and in CI systems? Also, it should show 3 rows including row showing "A""B""C" as it is shown in windows/ubuntu, why it is showing only 1 row here?
> 
> <img width="1044" alt="Screenshot 2022-02-07 at 2 19 08 PM" src="https://user-images.githubusercontent.com/43534309/152755889-a148fd24-3b62-4e86-a3f5-5b8c0c989f77.png">

I got the 2nd part of the question myself which is because of white gridlines used in AquaLookAndFeel so invisible..

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PR: https://git.openjdk.java.net/jdk/pull/7219