java/awt/Focus/ModalExcludedWindowClickTest: Test failed

ADDITIONAL SYSTEM INFORMATION :
Microsoft Windows [Version 10.0.17134.165]

JDK under test: C:\\Program Files\\Java\\jdk-10.0.2
java version "10.0.2" 2018-07-17
Java(TM) SE Runtime Environment 18.3 (build 10.0.2+13)
Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10.0.2+13, mixed mode)


A DESCRIPTION OF THE PROBLEM :
The test java/awt/Focus/ModalExcludedWindowClickTest/ModalExcludedWindowClickTest.html failed on Windows and MacOSX. The issue was not observed on Linux.
It is similar to the issue JDK-6848389 which was closed as "Cannot Reproduce"

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
>java -jar jtreg\lib\jtreg.jar -ignore:quiet -v -a -xml -testjdk:"C:\Program Files\Java\jdk-10.0.2" -javaoptions:"-Djava.awt.headless=false" test\java\awt\Focus\ModalExcludedWindowClickTest\ModalExcludedWindowClickTest.html

ACTUAL -
#section:applet
----------messages:(4/268)----------
command: applet ModalExcludedWindowClickTest.html
reason: User specified action: run applet ModalExcludedWindowClickTest.html
Additional options from @modules: --add-modules java.desktop --add-exports java.desktop/sun.awt=ALL-UNNAMED
elapsed time (seconds): 1.32
----------System.out:(2/108)----------
Any messages for the tester will display here.
Clicking java.awt.Button[button0,0,0,200x200,label=Button]
----------System.err:(6/431)----------
java.lang.RuntimeException: Test failed!
at ModalExcludedWindowClickTest.test(ModalExcludedWindowClickTest.java:106)
at ModalExcludedWindowClickTest.start(ModalExcludedWindowClickTest.java:99)
at com.sun.javatest.regtest.agent.AppletWrapper$AppletRunnable.run(AppletWrapper.java:158)
at java.base/java.lang.Thread.run(Thread.java:844)
STATUS:Failed.Applet thread threw exception: java.lang.RuntimeException: Test failed!

---------- BEGIN SOURCE ----------
http://hg.openjdk.java.net/jdk10/jdk10/jdk/file/777356696811/test/java/awt/Focus/ModalExcludedWindowClickTest/ModalExcludedWindowClickTest.java
---------- END SOURCE ----------

FREQUENCY : always