Bug 171415 [Viewers] Table viewer needs to clear label, image when items are reused
If an item is reused for a different element on a refresh, the table viewer needs to clear the label and image from the item being reused. This is necessary to communicate to the label provider that a new label is needed (i.e. the label provider may defer providing a label if decorators are not ready). This is what the tree viewer does. To see the problem, open the Java Browsing perspective and select a Java project. Then click between different packages. Notice that some of the labels in the Types list take a while to update. Opening one of these reveals that the label is showing the wrong text.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTableViewer.java
if (contentProvider instanceof ILazyContentProvider) {
							((ILazyContentProvider) contentProvider)
									.updateElement(index);
							return;
						}
					}
					associate(element, item);
					updateItem(item, element);
				}
			});
		}
		/**
		 * Get the element at index.Resolve it lazily if this is available.
		 * 
		 * @param index
		 * @return Object or <code>null</code> if it could not be found
		 */
		protected Object resolveElement(int index) {
			Object element = null;
			if (index < cachedElements.length) {
				element = cachedElements[index];
			}
			return element;
		}
		/**
		 * A non visible item has been added.
		 * 
		 * @param element
		 * @param index
		 */