Bug 310494 [LinkedResources] Preference "Link and create virtual folders" does not work
I20100425-2000 The 2 options on the Linked Resourced with name "Link and create virtual folders" don't work. When they are selected, dropping items does nothing. In CopyFilesAndFoldersOperation#copyOrLinkFiles(..), the test "hasFlag(dropOperation, ImportTypeDialog.IMPORT_VIRTUAL_FOLDERS_AND_LINKS)" always fails because dropOperation is always COPY.
bundles/org.eclipse.ui.ide/extensions/org/eclipse/ui/actions/CopyFilesAndFoldersOperation.java
* Records the core exception to be displayed to the user once the action is
	 * finished.
	 * 
	 * @param error
	 *            a <code>CoreException</code>
	 */
	private void recordError(CoreException error) {
		if (errorStatus == null) {
			errorStatus = new MultiStatus(PlatformUI.PLUGIN_ID, IStatus.ERROR,
					getProblemsMessage(), error);
		}
		errorStatus.merge(error.getStatus());
	}
	/**
	 * Checks whether the destination is valid for copying the source resources.
	 * <p>
	 * Note this method is for internal use only. It is not API.
	 * </p>
	 * 
	 * @param destination
	 *            the destination container
	 * @param sourceResources
	 *            the source resources
	 * @return an error message, or <code>null</code> if the path is valid
	 */
	public String validateDestination(IContainer destination,
			IResource[] sourceResources) {
		if (!isAccessible(destination)) {
			return IDEWorkbenchMessages.CopyFilesAndFoldersOperation_destinationAccessError;
		}