RFR: 8236907: JTable added to nested panels does not paint last visible row

[Tejesh R]

On Mon, 14 Feb 2022 06:53:18 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

>> Issue in painting last row of JTable due to decrement in `MaxRow `during computation. Differences in `MaxRow `computation between `TablePrintable` and `BasicTableUI `class. The Bug is fixed in both the classes. Test Case added to validate the same.
>
> src/java.desktop/share/classes/javax/swing/plaf/basic/BasicTableUI.java line 1903:
> 
>> 1901:     private void paintDropLines(Graphics g) {
>> 1902:         JTable.DropLocation loc = table.getDropLocation();
>> 1903:         if (loc == null) {
> 
> Deleting this seems to have regressed JDK-8081491 where 1 extra row is printed per page..
> jdk/test/java/awt/print/PageFormat/ImageableAreaTest.java is supposed to print 35 rows which was visible in console but it prints 36 rows..

The mentioned test computes 36 rows for frame height of 600 units. The 36th row is 18% visible in console and in printing its 100% visible. I have done the testing for the bug fix with an automated test case LastRowVisible.java and with the below test cases.
1. jdk/test/java/awt/print/PageFormat/ImageableAreaTest.java
2. jdk/test/javax/swing/JTable/LostTextTest.java
3. test/jdk/javax/swing/JTable/TestClearSel.java
The maxRow computations are just fine for console and printable views, the only thing is visibility of the same when setSize of frame is not a multiple of rowHeight of a table......

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PR: https://git.openjdk.java.net/jdk/pull/7422