Testsuite name: Swing manual
Test name(s): Swing_JMenu/Manual/MenuLAFDemo
Product(s) tested:OracleJDK13b25(64bit)/tonga-4.0.2-rc2
OS/architecture:ubuntu19.04-x64
option: -Dswing.defaultlaf=com.sun.java.swing.plaf.gtk.GTKLookAndFeel

Actual behavior:
1.We can't distinguish whether menu has selection bar.Refer to MenuLAFDemo-base13b24.jpg
2.No such issue without option.Refer to nooption-MenuLAFDemo.jpg.
3.There is no such issue on ubuntu18.04-x64/OracleJDK13b25 with the same option.Refer to ubuntu18.04-MenuLAFDemo.jpg
 
Affect case:
Swing_JMenu/Manual/MenuLAFDemo execute_script "manual,MenuLAFDemo" Scenarios 1,Scenarios 3,Scenarios 4,Scenarios 5,Scenarios 6.