Bug 98107 [Viewers] Change visibility of AbstractTreeViewer#internalRemove from private to protected
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
protected void internalExpandToLevel(Widget widget, int level) {
        if (level == ALL_LEVELS || level > 0) {
            createChildren(widget);
            if (widget instanceof Item)
                setExpanded((Item) widget, true);
            if (level == ALL_LEVELS || level > 1) {
                Item[] children = getChildren(widget);
                if (children != null) {
                    int newLevel = (level == ALL_LEVELS ? ALL_LEVELS
                            : level - 1);
                    for (int i = 0; i < children.length; i++)
                        internalExpandToLevel(children[i], newLevel);
                }
            }
        }
    }
    /**
     * Non-recursively tries to find the given element as a child of the given
     * parent item.
     * 
     * @param parent
     *           the parent item
     * @param element
     *           the element
     * @return Widget
     */
    private Widget internalFindChild(Item parent, Object element) {
        Item[] items = getChildren(parent);
        for (int i = 0; i < items.length; i++) {
            Item item = items[i];