RFR: 8311031: JTable header border vertical lines are not aligned with data grid lines [v6]

[Abhishek Kumar]

On Tue, 18 Jul 2023 04:36:50 GMT, Tejesh R <tr at openjdk.org> wrote:

>> The header border uses `g.drawLine` whereas the JTable data grid lines uses `SwingUtilities2.drawVLine` and `SwingUtilities2.drawHLine` to draw horizontal and vertical lines. The SwingUtilities2 uses `Graphics.fillRect` which contributes to the difference between the position of these two lines which happens/visible at higher ui scaling (difference in alignment between vertical lines of these two). The fix propose to use the same methods for metal L&F of JTable header border paint. 
>> CI testing shows green.
>> 
>> ![image](https://github.com/openjdk/jdk/assets/94159358/f6d1d822-55ba-4ad3-9914-d3f68b67a6c5)
>
> Tejesh R has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Review fix

Marked as reviewed by abhiscxk (Committer).

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PR Review: https://git.openjdk.org/jdk/pull/14766#pullrequestreview-1534675604