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
* Sets the enabled state of this action.
     * <p>
     * When an action is in the enabled state, the control associated with 
     * it is active; triggering it will end up inkoking this action's 
     * <code>run</code> method.
     * </p>
     * <p>
     * Fires a property change event for the <code>ENABLED</code> property
     * if the enabled state actually changes as a consequence.
     * </p>
     *
     * @param enabled <code>true</code> to enable, and
     *   <code>false</code> to disable
     * @see #ENABLED
     */
    public void setEnabled(boolean enabled);
    /**
     * Sets a help listener for this action. 
     *
     * @param listener a help listener for this action
     */
    public void setHelpListener(HelpListener listener);
    /**
     * Sets the hover image for this action, as an image descriptor.
     * <p>
     * Hover images will be used on platforms that support changing the image
     * when the user hovers over the item.Fires a property change event for 
     * the <code>IMAGE</code> property
     * if the image actually changes as a consequence.
     * </p>