Bug 243824 [CommonNavigator] lacks table / tree-table support
SafeDelegateCommonLabelProvider does not allow ITableLabelProvider instances to be used or delegated to. To attempt to use an ITableLabelProvider will have no direct result at all. Even customizing the top level label provider used in the common navigator, making that one an ITableLabelProvider, does nothing because NavigatorContentExtension wraps the instantiated user label provider in a SafeDelegateCommonLabelProvider, which implements many interfaces but not ITableLabelProvider. The solution is to apply this patch to SafeDelegateCommonLabelProvider. At that point, an adopter can customize his Common Viewer's top level label provider to pass things down appropriately. The patch needed is only to SafeDelegateCommonLabelProvider
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/NavigatorContentServiceLabelProvider.java
* <p>
	 * Return a String representation of anElement to be used as the display name in the tree
	 * viewer.
	 * </p>
	 * {@inheritDoc}
	 * 
	 * @param anElement
	 *            An element from the Tree Viewer 
	 * @return The String label to display for the object when represented in the viewer.
	 * @see org.eclipse.jface.viewers.ILabelProvider#getText(java.lang.Object)
	 */
	public String getText(Object anElement) {
		ILabelProvider[] labelProviders = contentService.findRelevantLabelProviders(anElement);
		String text = null;
		for (int i = 0; i < labelProviders.length; i++) {
			text = labelProviders[i].getText(anElement);
			if (text != null)
				return text;
		}
		return NLS.bind(CommonNavigatorMessages.NavigatorContentServiceLabelProvider_Error_no_label_provider_for_0_, anElement);	
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.jface.viewers.DelegatingStyledCellLabelProvider.IStyledLabelProvider#getStyledText(java.lang.Object)
	 */
	public StyledString getStyledText(Object anElement) {
		ILabelProvider[] labelProviders = contentService.findRelevantLabelProviders(anElement);
		String text = null;
		for (int i = 0; i < labelProviders.length; i++) {
			if (labelProviders[i] instanceof IStyledLabelProvider) {