RFR: JDK-8016524: [macosx] Bottom line is not visible for JTableHeader [v4]

[Harshitha Onkar]

On Tue, 1 Feb 2022 04:19:55 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

>> I now see it fail locally in windows system also along with ubuntu. windows screenshot here where the border is white which is why it fails
>> ![JTheaderBorder](https://user-images.githubusercontent.com/43534309/151753660-92d6021a-30d6-4215-97b0-7ab17ddb88d4.png)
>
> It seems there's a anomaly for JTableHeader border in native and jdk in Windows L&F..
> The system table shows here doesn't show any line
> ![JTheaderBorder-win](https://user-images.githubusercontent.com/43534309/151911992-846f2f21-c939-482f-9ef5-746d07c0b410.png)
> 
> whereas in our SwingSet2 we have a light grey line
> ![image](https://user-images.githubusercontent.com/43534309/151912084-c9cd39a5-74de-4ef9-a925-6081e8c4d294.png)
> 
> Technically, it might be construed as a bug but I guess I will prefer a demarcation line between header and body.
> It's upto you if you want to take a look at this in a separate issue or in this.

@prsadhuk Thank you for looking into it. I think this fix will require a change in Window related L&F classes. I think it would help me if I track this as separate issue.

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