Bug 271744 [Viewers] [JFace] TreeViewer not closing CellEditors on Collapse
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TreeViewer.java
item = (TreeItem) createNewRowPart(null, flags, ix).getItem();
		}
		return item;
	}
	/*
	 * (non-Javadoc) Method declared in AbstractTreeViewer.
	 */
	protected void removeAll(Control widget) {
		((Tree) widget).removeAll();
	}
	/*
	 * (non-Javadoc) Method declared in AbstractTreeViewer.
	 */
	protected void setExpanded(Item node, boolean expand) {
		((TreeItem) node).setExpanded(expand);
		if (contentProviderIsLazy) {
			
			getControl().update();
		}
	}
	/*
	 * (non-Javadoc) Method declared in AbstractTreeViewer.
	 */
	protected void setSelection(List items) {
		Item[] current = getSelection(getTree());
		
		if (isSameSelection(items, current)) {
			return;
		}
		TreeItem[] newItems = new TreeItem[items.size()];