Bug 48452 Widget is disposed while closing cool bar
This is the problem that is occurring in the nightly builds. There is something happening where a cool bar is attempting to layout disposed cool bar items.
bundles/org.eclipse.jface/src/org/eclipse/jface/action/ToolBarContributionItem.java
private int minimumItemsToShow = SHOW_ALL_ITEMS;
	
	/**
	 * Enable/disable chevron support.
	 */
	private boolean useChevron = true;
	
	/**
	 * Current width of cool item. 
	 */
	private int currentWidth = -1;
	
	/**
	 * Current height of cool item
	 */
	private int currentHeight = -1;
	
	/**
	 * The widget created for this item; <code>null</code>
	 * before creation and after disposal.
	 */
	private CoolItem coolItem = null;
	
	/**
	 * Creates a tool bar contribution item.
	 * 
	 * @param toolBarManager the tool bar manager to wrap
	 * @param id the contribution item id, or <code>null</code> if none
	 */
	public ToolBarContributionItem(IToolBarManager toolBarManager, String id) {