Index: javax/swing/text/SimpleAttributeSet.java
===================================================================
RCS file: /cvsroot/classpath/classpath/javax/swing/text/SimpleAttributeSet.java,v
retrieving revision 1.5
diff -u -r1.5 SimpleAttributeSet.java
--- javax/swing/text/SimpleAttributeSet.java	11 Nov 2004 22:36:46 -0000	1.5
+++ javax/swing/text/SimpleAttributeSet.java	17 Apr 2005 18:52:11 -0000
@@ -63,7 +63,10 @@
 
   public void addAttribute(Object name, Object value)
   {
-    tab.put(name, value);
+    if (value == null)
+      tab.remove(name);
+    else
+      tab.put(name, value);
   }
 
   public void addAttributes(AttributeSet attributes)