[8] Review request for 8021253 JFileChooser does not react on pressing enter since java 7

[Alexander Scherbatiy]

Hello,
Could you review the fix:
  bug: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8021253
  webrev: http://cr.openjdk.java.net/~alexsch/8021253/webrev.00

  The default button is only set for a dialog created in methods 
show*Dialog() after the 5035693 fix
  and is not set if put a filechooser on a user frame.

  The fix installs hierarchy listener that set the default button when 
the filechooser parent is changed.


Thanks,
Alexandr.