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
/**
     * Sets whether color icons should be used in toolbars.
     * 
     * @param useColorIcons <code>true</code> if color icons should be used in toolbars, 
     *   <code>false</code> otherwise
     */
    public static void setUseColorIconsInToolbars(boolean useColorIcons) {
        USE_COLOR_ICONS = useColorIcons;
    }
    /**
     * The presentation mode.
     */
    private int mode = 0;
    /**
     * The action.
     */
    private IAction action;
    /**
     * The listener for changes to the text of the action contributed by an
     * external source.
     */
    private final IPropertyChangeListener actionTextListener = new IPropertyChangeListener() {
        /**
         * @see IPropertyChangeListener#propertyChange(PropertyChangeEvent)
         */
        public void propertyChange(PropertyChangeEvent event) {
            update(event.getProperty());
        }
    };
    /**