Bug 230218 [JFace] Test failures in PresentationsTestSuite and RCP Tests
bundles/org.eclipse.jface/src/org/eclipse/jface/resource/ColorRegistry.java
* <p>
     * A property change event is reported whenever the mapping from a symbolic
     * name to a color changes. The source of the event is this registry; the
     * property name is the symbolic color name.
     * </p>
     * 
     * @param symbolicName the symbolic color name
     * @param colorData an <code>RGB</code> object
     * @param update - fire a color mapping changed if true. False if this
     *            method is called from the get method as no setting has
     *            changed.
     */
    private void put(String symbolicName, RGB colorData, boolean update) {
        Assert.isNotNull(symbolicName);
        Assert.isNotNull(colorData);
        RGB existing = (RGB) stringToRGB.get(symbolicName);
        if (colorData.equals(existing)) {
			return;
		}
        Color oldColor = (Color) stringToColor.remove(symbolicName);
        stringToRGB.put(symbolicName, colorData);
        if (update) {
			fireMappingChanged(symbolicName, existing, colorData);
		}
        if (oldColor != null) {
			staleColors.add(oldColor);
		}
    }
}