Bug 230218 [JFace] Test failures in PresentationsTestSuite and RCP Tests
bundles/org.eclipse.jface/src/org/eclipse/jface/resource/ColorRegistry.java
*/
    private Map stringToRGB = new HashMap(7);
    /**
     * Runnable that cleans up the manager on disposal of the display.
     */
    protected Runnable displayRunnable = new Runnable() {
        public void run() {
            clearCaches();
        }
    };
    /**
     * Create a new instance of the receiver that is hooked to the current 
     * display.
     * 
     * @see org.eclipse.swt.widgets.Display#getCurrent()
     */
    public ColorRegistry() {
        this(Display.getCurrent(), true);
    }
    /**
     * Create a new instance of the receiver.
     * 
     * @param display the <code>Display</code> to hook into.
     */
    public ColorRegistry(Display display) {
    	this (display, true);
    }
    /**
     * Create a new instance of the receiver.
     *