6827800: Default button is activated even when it is invisible
Reviewed-by: serb, rchamyal

8133039: Provide public API to sun.swing.UIAction#isEnabled(Object)
Reviewed-by: serb, azvegint

8054834: Modular Source Code
Reviewed-by: alanb, chegar, ihse, mduigou
Contributed-by: alan.bateman@oracle.com, alex.buckley@oracle.com, chris.hegarty@oracle.com, erik.joelsson@oracle.com, jonathan.gibbons@oracle.com, karen.kinnear@oracle.com, magnus.ihse.bursie@oracle.com, mandy.chung@oracle.com, mark.reinhold@oracle.com, paul.sandoz@oracle.com