Bug 89137 [JFace] - API Review - "temporary" API in AbstractTreeViewer
AbstractTreeViewer contains two methods documented as "temporary" internalRefresh(Widget, Object) internalAdd(Widget, Object, Object [])
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
ArrayList list = new ArrayList(items.length);
        for (int i = 0; i < items.length; i++) {
            Widget item = items[i];
            Object e = item.getData();
            if (e != null)
                list.add(e);
        }
        return list;
    }
    /**
     * Handles a tree collapse event from the SWT widget.
     * 
     * @param event
     *           the SWT tree event
     */
    protected void handleTreeCollapse(TreeEvent event) {
        if (event.item.getData() != null) {
            fireTreeCollapsed(new TreeExpansionEvent(this, event.item.getData()));
        }
    }
    /**
     * Handles a tree expand event from the SWT widget.
     * 
     * @param event
     *           the SWT tree event
     */
    protected void handleTreeExpand(TreeEvent event) {
        createChildren(event.item);
        if (event.item.getData() != null) {
            fireTreeExpanded(new TreeExpansionEvent(this, event.item.getData()));