RFR: JDK-8016524: [macosx] Bottom line is not visible for JTableHeader [v6]

[Harshitha Onkar]

On Mon, 7 Feb 2022 09:06:06 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

>> 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..

@prsadhuk Ready for review. Changed the test case to paint JFrame to BufferedImage. The test case is marked headful though robot calls are not used, as the JFrame rendering requires it to be headful.

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