It's now possible to get notified on preference object changes in

UserStore

java/com.sap.sse.common/src/com/sap/sse/common/Util.java

@@ -364,6 +364,12 @@ public class Util {
         }
         map.get(key).add(value);
     }
+    
+    public static <K, V> void removeFromAllValueSets(Map<K, Set<V>> map, V value) {
+        for (Set<V> set : map.values()) {
+            set.remove(value);
+        }
+    }
 
     public static String join(String separator, String... strings) {
         return joinStrings(separator, Arrays.asList(strings));