RFR 8191616: [TEST_BUG] : sanity/client/SwingSet/src/SliderDemoTest.java: Failed with TimeoutExpiredException: Wait "Wait till Slider attains the specified state."

[Alexandre (Shura) Iline]

Hi.

Please take a look on a quick fix for one of the client sanity tests. The tests 
is known fo file periodically with the same problem.

Bug: https://bugs.openjdk.java.net/browse/JDK-8191616
Webrev: http://cr.openjdk.java.net/~shurailine/8191616/webrev.00/

Thank you.

Shura