Please review the update of the test for jdk11.
Webrev can be found at: http://cr.openjdk.java.net/~serb/8198342/webrev.00
This test creates a number of FileSystemView which internally register a
listeners in UIManager, and the test assumes that these listeners will
be removed when FileSystemView will be collected by GC.(The listener
itself is removed by the Cleaner which uses a separate thread).
The problem is that in the high-loaded systems when the test is executed
in parallel with many other heavyweight tests the cleaner's thread is
not always able to remove the listeners in time and test fails.
In the fix the umber of FileSystemView in the test is decreased to 1, I
have checked that the test still fail before related bug(JDK-8175968)
Best regards, Sergey.