Bug 174701 [Viewers] ViewerRow should be reused instead of connected to the Item
Currently we create a ViewerRow ver every Item we create this can degrade performance, we should cache the row and reuse it
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TreeViewer.java
if (parentItem != null) {
							index = parentItem.indexOf(item);
						} else {
							index = getTree().indexOf(item);
						}
						virtualLazyUpdateWidget(
								parentItem == null ? (Widget) getTree()
										: parentItem, index);
					}
				}
			});
		}
	}
	protected ColumnViewerEditor createViewerEditor() {
		return new TreeViewerEditor(this,null,new ColumnViewerEditorActivationStrategy(this),ColumnViewerEditor.DEFAULT);
	}
	/*
	 * (non-Javadoc) Method declared in AbstractTreeViewer.
	 */
	protected Item newItem(Widget parent, int flags, int ix) {
		TreeItem item;
		if (parent instanceof TreeItem) {
			item = (TreeItem) createNewRowPart(getViewerRowFromItem(parent),
					flags, ix).getItem();
		} else {
			item = (TreeItem) createNewRowPart(null, flags, ix).getItem();
		}
		return item;
	}
	/*