Bug 251257 [Contributions] IAction.setImageDescriptor() javadoc needs to note "image vs. checked" platform discrepancy
bundles/org.eclipse.jface/src/org/eclipse/jface/action/IAction.java
* used in cheat sheets). Clients should always assume that running the
     * action succeeded in the absence of notification to the contrary. 
     * </p>
     * 
     * @since 3.0
     */
    public static final String RESULT = "result"; 
    
    /**
     * Property name of an action's handler. Some actions delegate some or all
     * of their behaviour or state to another object. In this case, if the
     * object to which behaviour has been delegated changes, then a property
     * change event should be sent with this name.
     * 
     * This is used to support backward compatibility of actions within the
     * commands framework.
     * 
     * @since 3.1
     */
	public static final String HANDLED = IHandlerAttributes.ATTRIBUTE_HANDLED;
    /**
     * Adds a property change listener to this action.
     * Has no effect if an identical listener is already registered.
     *
     * @param listener a property change listener
     */
    public void addPropertyChangeListener(IPropertyChangeListener listener);
    /**
     * Returns the accelerator keycode for this action.
     * The result is the bit-wise OR of zero or more modifier masks