Bug 98107 [Viewers] Change visibility of AbstractTreeViewer#internalRemove from private to protected
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
* 
     * @param element
     *           the element
     * @param expanded
     *           <code>true</code> if the node is expanded, and <code>false</code>
     *           if collapsed
     */
    public void setExpandedState(Object element, boolean expanded) {
        Assert.isNotNull(element);
        Widget item = internalExpand(element, false);
        if (item instanceof Item) {
            if (expanded) {
                createChildren(item);
            }
            setExpanded((Item) item, expanded);
        }
    }
    /**
     * Sets the selection to the given list of items.
     * 
     * @param items
     *           list of items (element type: <code>org.eclipse.swt.widgets.Item</code>)
     */
    protected abstract void setSelection(List items);
    
    protected void setSelectionToWidget(List v, boolean reveal) {
        if (v == null) {
            setSelection(new ArrayList(0));
            return;
        }