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
Widget w = internalExpand(elementOrTreePath, false);
			if (w instanceof Item) {
				newSelection.add(w);
			} else if (w == null && elementOrTreePath instanceof TreePath) {
				TreePath treePath = (TreePath) elementOrTreePath;
				Object element = treePath.getLastSegment();
				if (element != null) {
					w = internalExpand(element, false);
					if (w instanceof Item) {
						newSelection.add(w);
					}
				}
			}
		}
		setSelection(newSelection);
		
		
		
		
		if (reveal && newSelection.size() > 0) {
			
			
			for (int i = (newSelection.size()-1); i >= 0; i--) {
				showItem((Item) newSelection.get(i));
			}
		}
	}
	/**
	 * Shows the given item.
	 *