RFR: 8198623: java/awt/KeyboardFocusmanager/TypeAhead/EnqueueWithDialogButtonTest/EnqueueWithDialogButtonTest.java fails on mac

[Pankaj Bansal]

Hi All,

Please review the following test only fix for jdk15.
Bug : https://bugs.openjdk.java.net/browse/JDK-8198623
webrev: http://cr.openjdk.java.net/~pbansal/8198623/webrev00/ 
<http://cr.openjdk.java.net/%7Epbansal/8198623/webrev00/>

These tests were added to the ProblemList as they were failing 
continuously.
I have made some changes to properly dispose the frame to stabilize the 
tests. I have run multiple iterations of the tests on mach5 and they are 
always passing. Links in JBS.

Regards
Pankaj