[9] Review request for 8031696 [macosx] TwentyThousandTest test failed with OOM

[Alexander Scherbatiy]

Hello,
Could you review the fix:
  bug: https://bugs.openjdk.java.net/browse/JDK-8031696
  webrev: http://cr.openjdk.java.net/~alexsch/8031696/webrev.00

  Setting a new file filter in JFileChooser on Mac OS X starts 
LoadFilesThread from AquaFileSystemModel.
  After the fix JDK-8022398 the file filter changed event is fired even 
the new file filter equals to the old one.
  The fix does not fire the file filter changed event in case the file 
filter has not been changed.

Thanks,
Alexandr.