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
public void fill(CoolBar coolBar, int index) {
	   if (coolItem == null && coolBar != null) {
	   	   ToolBar toolBar = toolBarManager.createControl(coolBar);
		   
		   
		   if (toolBar.getItemCount() < 1) return;
		   int flags = SWT.DROP_DOWN;
		   if (index >= 0) {
		   		coolItem = new CoolItem(coolBar, flags, index);
		   }else {
		   		coolItem = new CoolItem(coolBar, flags);
		   }
		      
		   coolItem.setData(this);
		   
		   coolItem.setControl(toolBar);   
		   
		   
		   toolBar.addListener(SWT.MenuDetect, new Listener() {
			   public void handleEvent(Event event) {
			   		
			   	 	
					 if (toolBarManager.getContextMenuManager() == null) {   
					 	handleContextMenu(event);
					 }
			   }
		   });
		   
		   
		   if (getUseChevron()) {