FULL PRODUCT VERSION :
JDK under test: C:\\Java\\jdk1.8.0_112
java version "1.8.0_112"
Java(TM) SE Runtime Environment (build 1.8.0_112-b15)
Java HotSpot(TM) 64-Bit Server VM (build 25.112-b15, mixed mode)

JDK under test: C:\\Java\\jdk-9
java version "9-ea"
Java(TM) SE Runtime Environment (build 9-ea+148)
Java HotSpot(TM) 64-Bit Server VM (build 9-ea+148, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 10.0.14393]

A DESCRIPTION OF THE PROBLEM :
The test javax/swing/JSlider/6348946/bug6348946.java fails with the message "The thumb moved to the right instead of the left!" on Windows with both Java 8 and 9. This issue was not observed on Linux, OSX.
The test passes in standalone mode but fails in the group javax/swing/JScrollPane + javax/swing/JSlider.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
jtreg -v -a -xml -testjdk:C:/Java/jdk-9 -javaoptions:-Djava.awt.headless=false -timeoutFactor:2 test/javax/swing/JScrollPane test/javax/swing/JSlider


ERROR MESSAGES/STACK TRACES THAT OCCUR :
#section:main
----------messages:(4/137)----------
command: main bug6348946
reason: Assumed action based on file name: run main bug6348946
Mode: othervm
elapsed time (seconds): 0.983
----------configuration:(0/0)----------
----------System.out:(0/0)----------
----------System.err:(14/944)----------
java.lang.RuntimeException: The thumb moved to the right instead of the left!
at bug6348946.checkResult(bug6348946.java:98)
at bug6348946.main(bug6348946.java:64)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:538)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:110)
at java.base/java.lang.Thread.run(Thread.java:844)

JavaTest Message: Test threw exception: java.lang.RuntimeException: The thumb moved to the right instead of the left!
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: The thumb moved to the right instead of the left!

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
http://hg.openjdk.java.net/jdk8u/jdk8u/jdk/file/0e4fc29a5ce4/test/javax/swing/JSlider/6348946/bug6348946.java
---------- END SOURCE ----------