The class javax.swing.text.TabSet does not override .equals() method, which causes comparisons to fail even if the TabStop array does contain the same TabStops.
Even worse, it causes AttributeSet(s) not to be equal, even though the only difference is another object instance of TabSet. This bug was revealed in conjunction with the Java AccessBridge for Gnome, which has to rely on AttributeSet.equals().
BugTraq+ Release Management Values
COMMIT TO FIX:
Name: ik75403 Date: 03/10/2003
as description says TabSet does not override equals.
We will do this for the next jdk release