Bug 81070 ElementMapper should not use Integer keys computed from System#identityHashCode
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/workingsets/WorkingSetModel.java
public static final String CHANGE_WORKING_SET_MODEL_CONTENT= "workingSetModelChanged"; 
	
	public static final IElementComparer COMPARER= new WorkingSetComparar();
	
	private static final String TAG_LOCAL_WORKING_SET_MANAGER= "localWorkingSetManager"; 
	private static final String TAG_ACTIVE_WORKING_SET= "activeWorkingSet"; 
	private static final String TAG_WORKING_SET_NAME= "workingSetName"; 
	private static final String TAG_CONFIGURED= "configured"; 
	private ILocalWorkingSetManager fLocalWorkingSetManager;
	private List fActiveWorkingSets;
	private ListenerList fListeners;
	private IPropertyChangeListener fWorkingSetManagerListener;
	private OthersWorkingSetUpdater fOthersWorkingSetUpdater;
	private ElementMapper fElementMapper= new ElementMapper();
	
	private boolean fConfigured;
	private static class WorkingSetComparar implements IElementComparer {