Bug 181061 [Viewers] JFace viewers performance issues in 3.3
A number of the JFace performance tests are red since I20060926-0800.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
boolean useRedraw = true;
				
				
				if (useRedraw) {
					tree.setRedraw(false);
				}
				removeAll(tree);
				tree.setData(getRoot());
				internalInitializeTree(tree);
				if (useRedraw) {
					tree.setRedraw(true);
				}
			}
		});
	}
	/**
	 * @param tree
	 */
	protected void internalInitializeTree(Control tree) {
		createChildren(tree);
		internalExpandToLevel(tree, expandToLevel);
	}
	/**
	 * Recursively collapses the subtree rooted at the given widget to the given
	 * level.
	 * <p>
	 * </p>
	 * Note that the default implementation of this method does not call
	 * <code>setRedraw</code>.
	 *