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
coolItem.addSelectionListener(new SelectionAdapter() {
				   	public void widgetSelected(SelectionEvent event) {
				   		if (event.detail == SWT.ARROW) {
				   			handleChevron(event);
				   		}
				   	}
			   });
		   }
		   
		   
		   coolItem.addDisposeListener(new DisposeListener() {
				public void widgetDisposed(DisposeEvent event) {
					handleWidgetDispose(event);
				}
		   });
		   
		   
		   updateSize(true);
	   }
	}
	
	/**
	 * Handles the event when the toobar item does not have its own context menu.
	 * @param event the event object
	 */
	private void handleContextMenu(Event event) {
		ToolBar toolBar = toolBarManager.getControl();
		
		Menu parentMenu = toolBar.getParent().getMenu();