@Nullable
 public MultiMap<LocalChangeList, Change> moveChangesTo(
     final String name, final Change[] changes) {
   final LocalChangeListImpl changeList = (LocalChangeListImpl) myMap.get(name);
   if (changeList != null) {
     final MultiMap<LocalChangeList, Change> result = new MultiMap<LocalChangeList, Change>();
     for (LocalChangeList list : myMap.values()) {
       if (list.equals(changeList)) continue;
       for (Change change : changes) {
         final Change removedChange = ((LocalChangeListImpl) list).removeChange(change);
         if (removedChange != null) {
           changeList.addChange(removedChange);
           result.putValue(list, removedChange);
         }
       }
     }
     return result;
   }
   return null;
 }