Bug 125011 [Contributions] ActionContributionItem should use text for tooltip in toolitems
If an action is added to a toolbar, and it has a name, but no tooltip set, the name should be used as the tooltip (except when the text is actually displayed on the toolitem using setText()) Clients sometimes forget to set the tooltip text when no specific tooltip message exists.
bundles/org.eclipse.jface/src/org/eclipse/jface/action/ActionContributionItem.java
* Remembers all images in use by this contribution item
     */
    private LocalResourceManager imageManager;
    
    /**
     * Listener for SWT button widget events.
     */
    private Listener buttonListener;
    /**
     * Listener for SWT menu item widget events.
     */
    private Listener menuItemListener;
    /**
     * Listener for action property change notifications.
     */
    private final IPropertyChangeListener propertyListener = new IPropertyChangeListener() {
        public void propertyChange(PropertyChangeEvent event) {
            actionPropertyChange(event);
        }
    };
    /**
     * Listener for SWT tool item widget events.
     */
    private Listener toolItemListener;
    /**
     * The widget created for this item; <code>null</code>
     * before creation and after disposal.
     */
    private Widget widget = null;
    /**