Bug 305739 [viewers] #expandToLevel(Object, level) retrieves all children when virtual
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TreeViewer.java
if (child.getData() != null) {
								disassociate(child);
							}
							item.clear(0, true);
						} else {
                            virtualLazyUpdateChildCount(item, item.getItemCount());
                        }
					}
				}
			}
		});
	}
	/**
	 * Update the widget at index.
	 * @param widget
	 * @param index
	 */
	private void virtualLazyUpdateWidget(Widget widget, int index) {
		boolean oldBusy = isBusy();
		setBusy(false);
		try {
			if (contentProviderIsTreeBased) {
				TreePath treePath;
				if (widget instanceof Item) {
					if (widget.getData() == null) {