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/TableViewer.java
* Creates a table viewer on a newly-created table control under the given
	 * parent. The table control is created using the given style bits. The
	 * viewer has no input, no content provider, a default label provider, no
	 * sorter, and no filters. The table has no columns.
	 * 
	 * @param parent
	 *            the parent control
	 * @param style
	 *            SWT style bits
	 */
	public TableViewer(Composite parent, int style) {
		this(new Table(parent, style));
	}
	/**
	 * Creates a table viewer on the given table control. The viewer has no
	 * input, no content provider, a default label provider, no sorter, and no
	 * filters.
	 * 
	 * @param table
	 *            the table control
	 */
	public TableViewer(Table table) {
		this.table = table;
		tableEditor = new TableEditor(table);
		hookControl(table);
	}
	public Control getControl() {
		return table;
	}
	/**