anchor.diff:  import '../preferences.dart' as preferences;
   import '../scm.dart';
   import '../workspace.dart';
  +
  +Logger _logger = new Logger('spark.files_controller');
   
   /**
    * An event that is sent to indicate the user would like to select a given
  
positive.code:   ListViewCell treeViewCellForNode(TreeView view, String nodeUid) {
      Resource resource = _filesMap[nodeUid];
      if (resource == null) {
        print('no resource for ${nodeUid}');
        assert(resource != null);
      }
      FileItemCell cell = new FileItemCell(resource);
      if (resource is Folder) {
  
negative.code: import 'dart:html' as html;
  
  import 'package:bootjack/bootjack.dart' as bootjack;
  import 'package:logging/logging.dart';
  
  import 'html_utils.dart';
  import 'widgets/file_item_cell.dart';
  