Bug 234345 [Viewers] AbstractTreeViewer#getChildren(Widget,Object[]) holds doc that it is experimental
a) Remove the experimental description => Why do we need this method b) Remove the method
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
return true;
	}
	
	protected void doUpdateItem(Widget widget, Object element, boolean fullMap) {
		boolean oldBusy = isBusy();
		setBusy(true);
		try {
			if (widget instanceof Item) {
				Item item = (Item) widget;
				
				if (fullMap) {
					associate(element, item);
				} else {
					Object data = item.getData();
					if (data != null) {
						unmapElement(data, item);
					}
					item.setData(element);
					mapElement(element, item);
				}
				
				SafeRunnable.run(new UpdateItemSafeRunnable(item, element));
			}
		} finally {
			setBusy(oldBusy);
		}
	}
	/**
	 * Expands all nodes of the viewer's tree, starting with the root. This
	 * method is equivalent to <code>expandToLevel(ALL_LEVELS)</code>.