Testsuite name: Swing manual
Test name(s): Swing_DnD/Manual/JTableTest
Product(s) tested:JDK 8u221b06 (64bit)/tonga-4.0.2-rc2
OS/architecture:oel7.6-uek-x64
option: -Dswing.defaultlaf=com.sun.java.swing.plaf.gtk.GTKLookAndFeel -Djdk.gtk.version=3

Actual behavior:
1.Scenario:3
step2:There is no shorter line of different color indicate in the column in GTK LookAndFeel.refer to JTableTest-option-cols.png.
No such issue without option, refer to JTableTest-no-option-cols.png

2.Scenario:4
step3:There is no shorter line of different color indicate in the row in GTK LookAndFeel.refer to JTableTest-rows.png
No such issue without option, refer to JTableTest-rows-no-option.png

3.The case description refer to TableTest.png

4.There is no such issue on oel6.4-uek-x86/JDK8u221b04(32bit) with the same option