code: function _addWelcomeProjectPath(path, currentProjects) {
          var pathNoSlash = FileUtils.stripTrailingSlash(path);  // "welcomeProjects" pref has standardized on no trailing "/"
  
          var newProjects;
  
          if (currentProjects) {
              newProjects = _.clone(currentProjects);
          } else {
              newProjects = [];
          }
  
          if (newProjects.indexOf(pathNoSlash) === -1) {
              newProjects.push(pathNoSlash);
          }
          return newProjects;
      }
docs: @private
  
  Adds the path to the list of welcome projects we've ever seen, if not on the list already.
  
  @param {string} path Path to possibly add
  @param {Array.<string>=} currentProjects Array of current welcome projects
  @return {Array.<string>} New array of welcome projects with the additional project added