RFR: 8311031: JTable header border vertical lines are not aligned with data grid lines [v3]

[Abhishek Kumar]

On Wed, 5 Jul 2023 08:25:20 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:
> 
>   Automated test added

test/jdk/javax/swing/JTableHeader/TableHeaderBorderPositionTest.java line 112:

> 110:         expectedRGB = imgDate.getRGB(verticalLineCol,0);
> 111: 
> 112:         for(int i = 0; i < imgHeader.getHeight();i++) {

Suggestion:

        for(int i = 0; i < imgHeader.getHeight(); i++) {

test/jdk/javax/swing/JTableHeader/TableHeaderBorderPositionTest.java line 114:

> 112:         for(int i = 0; i < imgHeader.getHeight();i++) {
> 113:             for(int j = verticalLineCol; j < verticalLineCol + 3; j++) {
> 114:                 if(expectedRGB != imgHeader.getRGB(j,i)) {

Suggestion:

                if (expectedRGB != imgHeader.getRGB(j, i)) {

test/jdk/javax/swing/JTableHeader/TableHeaderBorderPositionTest.java line 120:

> 118:         }
> 119: 
> 120:         for(int i = 0; i < table.getRowCount() * table.getRowHeight() * SCALE;i++) {

Suggestion:

        for(int i = 0; i < table.getRowCount() * table.getRowHeight() * SCALE; i++) {

test/jdk/javax/swing/JTableHeader/TableHeaderBorderPositionTest.java line 122:

> 120:         for(int i = 0; i < table.getRowCount() * table.getRowHeight() * SCALE;i++) {
> 121:             for(int j = verticalLineCol; j < verticalLineCol + 3; j++) {
> 122:                 if(expectedRGB != imgDate.getRGB(j,i)) {

Suggestion:

                if (expectedRGB != imgDate.getRGB(j, i)) {

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PR Review Comment: https://git.openjdk.org/jdk/pull/14766#discussion_r1254002735
PR Review Comment: https://git.openjdk.org/jdk/pull/14766#discussion_r1254004304
PR Review Comment: https://git.openjdk.org/jdk/pull/14766#discussion_r1254005124
PR Review Comment: https://git.openjdk.org/jdk/pull/14766#discussion_r1254005266