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
*                (inclusive)
	 * 
	 * @since 3.3
	 */
	protected abstract void doRemove(int[] indices);
	/**
	 * Shows the item. If the item is already showing in the receiver, this
	 * method simply returns. Otherwise, the items are scrolled until the item
	 * is visible.
	 * 
	 * @param item
	 *            the item to be shown
	 * 
	 * @exception IllegalArgumentException -
	 *                if the item is null
	 * 
	 * @since 3.3
	 */
	protected abstract void doShowItem(Item item);
	/**
	 * Deselects all selected items in the receiver.
	 * 
	 * @since 3.3
	 */
	protected abstract void doDeselectAll();
	/**
	 * Sets the receiver's selection to be the given array of items. The current
	 * selection is cleared before the new items are selected.
	 * <p>
	 * Items that are not in the receiver are ignored. If the receiver is