Bug 88993 [Viewers] CCE in AbstractTreeViewer.indexForElement(..)
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
tree.setRedraw(false);
        
        internalRefresh(tree, getRoot(), false, true);
        tree.setRedraw(true);
    }
    /**
     * Creates a new item.
     * 
     * @param parent
     *           the parent widget
     * @param style
     *           SWT style bits
     * @param index
     *           if non-negative, indicates the position to insert the item
     *           into its parent
     * @return the newly-created item
     */
    protected abstract Item newItem(Widget parent, int style, int index);
    /**
     * Removes the given elements from this viewer. The selection is updated if
     * required.
     * <p>
     * This method should be called (by the content provider) when elements
     * have been removed from the model, in order to cause the viewer to
     * accurately reflect the model. This method only affects the viewer, not
     * the model.
     * </p>
     * 
     * @param elements
     *           the elements to remove