Bug 261164 [CommonNavigator] Add dynamic tracing for DnD
The options were put in, but the tracing was never actually hooked up.
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/navigator/CommonDragAdapter.java
ISelectionProvider aProvider) {
		super();
		contentService = aContentService;
		provider = aProvider;
	}
	/**
	 * 
	 * @return An array of supported Drag Transfer types. The list contains [
	 *         {@link LocalSelectionTransfer#getTransfer()},
	 *         {@link PluginTransfer#getInstance()}] in addition to any
	 *         supported types contributed by the
	 *         {@link CommonDragAdapterAssistant assistants}.
	 * @see CommonDragAdapterAssistant
	 * @see LocalSelectionTransfer
	 * @see PluginTransfer
	 */
	public Transfer[] getSupportedDragTransfers() {
		CommonDragAdapterAssistant[] assistants = contentService
				.getDnDService().getCommonDragAssistants();
		Set supportedTypes = new LinkedHashSet();
		supportedTypes.add(PluginTransfer.getInstance());
		supportedTypes.add(LocalSelectionTransfer.getTransfer());
		Transfer[] transferTypes = null;
		for (int i = 0; i < assistants.length; i++) {
			transferTypes = assistants[i].getSupportedTransferTypes();
			for (int j = 0; j < transferTypes.length; j++) {
				if (transferTypes[j] != null) {
					supportedTypes.add(transferTypes[j]);
				}
			}