<AWT Dev> [10] Review request for 8132299: Test java/awt/Robot/ModifierRobotKey/ModifierRobotKeyTest.java fails on Linux

[Semyon Sadetsky]

Hello,

Please review fix for JDK9:

bug: https://bugs.openjdk.java.net/browse/JDK-8132299

webrev: http://cr.openjdk.java.net/~ssadetsky/8132299/webrev.00/

The issue itself is a linux/solaris specific. Alt-Gr modifier bit (1<<5) 
is not set in the KeyPress event which is sent by the closing key in the 
combination (which action should be modified). On platforms other than 
linux/solaris the ModifierRobotKeyTest.java successfully passes but 
takes a lot of time to execute.

Linux has two special keys assigned for 5th column as xmodmap command 
report:

mod5        ISO_Level3_Shift (0x5c),  Mode_switch (0xcb)

Java implementation uses Mode_switch native key for mapping to Alt-Gr. 
But Mode_switch is not processed as a modifier key by the native 
platform while ISO_Level3_Shift is processed as modifier. So, changing 
this mapping solves the problem.

Also, the ModifierRobotKeyTest.java is modified in the fix to decrease 
its execution time.

--Semyon