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
} else {
				internalVirtualRefreshAll();
			}
		} else {
			Widget w = findItem(element);
			if (w != null) {
				updateItem(w, element);
			}
		}
	}
	/**
	 * Refresh all with virtual elements.
	 * 
	 * @since 3.1
	 */
	private void internalVirtualRefreshAll() {
		Object root = getRoot();
		IContentProvider contentProvider = getContentProvider();
		
		if (!(contentProvider instanceof ILazyContentProvider)
				&& (contentProvider instanceof IStructuredContentProvider)) {
			
			if (root != null) {
				virtualManager.cachedElements = ((IStructuredContentProvider) getContentProvider())
						.getElements(root);
				doSetItemCount(virtualManager.cachedElements.length);
			}
		}
		doClearAll();
	}