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

[Harshitha Onkar]

On Mon, 31 Jan 2022 07:24:08 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

>> @prsadhuk I have changed the test case to explicitly set the table and header background to white. Mach5 tests are passing on all platforms including linux now. Can you please let me know in case you are seeing any issues on Ubuntu locally, with the new test case?
>
> 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)

@prsadhuk I have tagged this particular test case as mac-only to prevent test case issues arising from platform specific System LAF.

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