[9] Review Request for 6260348: GTK+ L&F JTextComponent not respecting desktop caret blink rate

[Semyon Sadetsky]

Hello,

Please review fix for JDK9:
web rev: http://cr.openjdk.java.net/~ssadetsky/6260348/webrev.00/
bug: https://bugs.openjdk.java.net/browse/JDK-6260348

***ROOT CAUSE
GTK L&F never took care about native GTK cursor blink settings.

***SOLUTION
Implement this feature.

***TESTING
Two test scenarios added. 1st sets GTK cursor blink enabled and blink 
time 200 ms. 2nd disables cursor blinking. Then Java text caret is 
checked to respect these settings.

--Semyon