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
if (!resource.isAccessible()) {
			return error(ResourceNavigatorMessages.getString("DropAdapter.canNotDropIntoClosedProject")); 
		}
		IContainer destination = getActualTarget(resource);
		if (destination.getType() == IResource.ROOT) {
			return error(ResourceNavigatorMessages.getString("DropAdapter.resourcesCanNotBeSiblings")); 
		}
		String message = null;
		
		if (FileTransfer.getInstance().isSupportedType(transferType)) {
			String[] sourceNames = (String[]) FileTransfer.getInstance().nativeToJava(transferType);
			CopyFilesAndFoldersOperation copyOperation = new CopyFilesAndFoldersOperation(getShell());
			message = copyOperation.validateImportDestination(destination, sourceNames);
		} 
		else if (sourceResources != null) {
			CopyFilesAndFoldersOperation operation;
			if (lastValidOperation == DND.DROP_COPY) {
				operation = new CopyFilesAndFoldersOperation(getShell());
			}
			else {
				operation = new MoveFilesAndFoldersOperation(getShell());
			}
			message = operation.validateDestination(destination, sourceResources);
		}		
		if (message != null) {
			return error(message);
		}
		return ok();
	}
}