anchor.diff:    // Implementation of FilesControllerDelegate interface.
   
     void selectInEditor(ws.File file,
  -                      {bool forceOpen: false, bool replaceCurrent: true}) {
  +                      {bool forceOpen: false,
  +                       bool replaceCurrent: true,
  +                       bool switchesTab: true}) {
       if (forceOpen || editorManager.isFileOpened(file)) {
  -      editorArea.selectFile(file, forceOpen: forceOpen,
  -          replaceCurrent: replaceCurrent);
  +      editorArea.selectFile(file,
  +          forceOpen: forceOpen,
  +          replaceCurrent: replaceCurrent,
  +          switchesTab: switchesTab);
       }
     }
   
  
positive.code: 
    void createActions() {
      actionManager = new ActionManager();
      actionManager.registerAction(new FileNewAction(this));
      actionManager.registerAction(new FileOpenAction(this));
      actionManager.registerAction(new FileSaveAction(this));
  
negative.code:     });
      return result;
    }
  
    /**
     * Returns true if `object` is a list of File.
     */
    bool _isFileList(Object object) {
      if (!_isResourceList(object)) {
        return false;
      }
      List<ws.Resource> resources = object as List;
      bool result = true;
      resources.forEach((ws.Resource resource) {
        if (resource is! ws.File) {
          result = false;
        }
      });
      return result;
    }
  }
  
  class FileOpenInTabAction extends SparkAction implements ContextAction {
    FileOpenInTabAction(Spark spark) :
        super(spark, "file-open-in-tab", "Open in a New Tab") {
      defaultBinding("alt-click");
    }
  
    void _invoke([List<ws.File> files]) {
      bool forceOpen = files.length > 1;
      files.forEach((ws.File file) {
        spark.selectInEditor(file, forceOpen: true, replaceCurrent: true);
      });
    }
  
    String get category => 'resource';
  
    bool appliesTo(Object object) => _isFileList(object);
  }
  
  class FileNewAction extends SparkAction implements ContextAction {
  