Bug 299536 API refers to non-API type UIResourceFilterDescription
I20100112 CreateGroupOperation and CreateFolderOperation have constructors that require a UIResourceFilterDescription[]. However this is a non-API type, so clients can't reference it without using internals. Either the constructor should be removed or something like UIResourceFilterDescription needs to be promoted to API. Also, shouldn't CreateFolderOperation be renamed CreateVirtualFolderOperation?
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/ResourceFilterGroup.java
int ops = DND.DROP_MOVE;
		Transfer[] transfers = new Transfer[] { filterCopyTransfer };
		filterView.addDragSupport(ops, transfers, drag);
		filterView.addDropSupport(ops, transfers,
				new FilterCopyDrop(filterView));
		filterView.getTree().addMenuDetectListener(new MenuDetectListener() {
			public void menuDetected(MenuDetectEvent e) {
				MenuManager mgr = new MenuManager();
				mgr.add(addSubFilterAction);
				filterView.getControl().setMenu(
						mgr.createContextMenu(filterView.getControl()));
			}
		});
	}
	Action addSubFilterAction = new AddSubFilterAction();
	class AddSubFilterAction extends Action {
		public AddSubFilterAction() {
			setText(NLS
					.bind(
							IDEWorkbenchMessages.ResourceFilterPage_addSubFilterActionLabel,
							null));
		}
		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.jface.action.Action#run()
		 */
		public void run() {
			ISelection selection = filterView.getSelection();
			if (selection instanceof IStructuredSelection) {