[OpenJDK 2D-Dev] [11] Review Request: 8198406 Test TestAATMorxFont is unstable

[Sergey Bylokhov]

Hello.
Please review the fix for jdk11.

Bug: https://bugs.openjdk.java.net/browse/JDK-8198406
Webrev can be found at: http://cr.openjdk.java.net/~serb/8198406/webrev.00

Initially, this test was marked as unstable, because sometimes it 
passed(when invokeLater did not start till the end of the main method) 
or failed when the code in invokeLater thrown an HeadlessException.

In the fix the test is reworked to use BufferedImage instead of Frame, 
so it will work in headful and headless environment.

Some additional info:
http://mail.openjdk.java.net/pipermail/2d-dev/2018-February/008947.html

-- 
Best regards, Sergey.