Bug 16308 [DND] dnd from os to navigator shows an incorrect icon
smoke test for 0518 it shows a move icon although move will not happen
bundles/org.eclipse.ui.views/src/org/eclipse/ui/views/navigator/NavigatorDropAdapter.java
* Returns an error status with the given info.
	 */
	private IStatus error(String message, Throwable exception) {
		return new Status(IStatus.ERROR, PlatformUI.PLUGIN_ID, 0, message, exception);
	}
	/**
	 * Returns an error status, indicating why the given source
	 * could not be copied or moved.
	 */
	private IStatus error(IResource source, String message) {
		if (getCurrentOperation() == DND.DROP_COPY) {
			return error(ResourceNavigatorMessages.format("DropAdapter.canNotCopy", new Object[] { source.getName(), message }), null); 
		} else {
			return error(ResourceNavigatorMessages.format("DropAdapter.canNotMove", new Object[] { source.getName(), message }), null); 
		}
	}
	
	/**
	 * Expands the selection of the given tree viewer.
	 */
	private void expandSelection(TreeItem selection) {
		if (selection == null)
			return;
		if (!selection.getExpanded()) {
			TreeViewer treeViewer = (TreeViewer) getViewer();
			treeViewer.expandToLevel(selection.getData(), 1);
		}
	}
	
	/**