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
if (stores == null) {
			return;
		}
		copyFileStores(destination, stores, false, monitor);
	}
	/**
	 * Build the collection of fileStores that map to fileNames. If any of them
	 * cannot be found then match then return <code>null</code>.
	 * 
	 * @param uris
	 * @return IFileStore[]
	 */
	private IFileStore[] buildFileStores(URI[] uris) {
		IFileStore[] stores = new IFileStore[uris.length];
		for (int i = 0; i < uris.length; i++) {
			IFileStore store;
			try {
				store = EFS.getStore(uris[i]);
			} catch (CoreException e) {
				StatusManager.getManager().handle(e, IDEWorkbenchPlugin.IDE_WORKBENCH);
				reportFileInfoNotFound(uris[i].toString());
				return null;
			}
			if (store == null) {
				reportFileInfoNotFound(uris[i].toString());
				return null;
			}
			stores[i] = store;
		}
		return stores;