Bug 172814 [Viewers] Rename AbstractViewerEditor to ColumnViewerEditor
There is no "AbstractViewer", and this class is referenced from ColumnViewer. To make the names more consistent, it should be called ColumnViewerEditor, not AbstractViewerEditor.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TreeViewer.java
item.setItemCount(1);
							TreeItem child = item.getItem(0);
							if (child.getData() != null) {
								disassociate(child);
							}
							item.clear(0, true);
						}
					}
				}
			}
		});
	}
	/**
	 * Update the widget at index.
	 * @param widget
	 * @param index
	 */
	private void virtualLazyUpdateWidget(Widget widget, int index) {
		if (contentProviderIsTreeBased) {
			TreePath treePath;
			if (widget instanceof Item) {
				if (widget.getData() == null) {
					
					
					return;
				}
				treePath = getTreePathFromItem((Item) widget);
			} else {
				treePath = TreePath.EMPTY;
			}