Bug 141192 [Viewers] Javadoc change about multiple equal elements in StructuredViewer and AbstractTreeViewer
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
*/
    protected AbstractTreeViewer() {
        
    }
    /**
     * Adds the given child elements to this viewer as children of the given
     * parent element. If this viewer does not have a sorter, the elements are
     * added at the end of the parent's list of children in the order given;
     * otherwise, the elements are inserted at the appropriate positions.
     * <p>
     * This method should be called (by the content provider) when elements
     * have been added to the model, in order to cause the viewer to accurately
     * reflect the model. This method only affects the viewer, not the model.
     * </p>
     * 
     * @param parentElementOrTreePath
     *           the parent element
     * @param childElements
     *           the child elements to add
     */
    public void add(Object parentElementOrTreePath, Object[] childElements) {
        Assert.isNotNull(parentElementOrTreePath);
        assertElementsNotNull(childElements);
        Widget[] widgets = internalFindItems(parentElementOrTreePath);
        
        if (widgets.length == 0) {
			return;
		}
		for (int i = 0; i < widgets.length; i++) {
			internalAdd(widgets[i], parentElementOrTreePath, childElements);