anchor.diff:    void _initLabels() {
       var webOutputLabelElement = querySelector('#web-output-label');
       if (webOutputLabelElement != null) {
  -      webOutputLabel = DElement(webOutputLabelElement);
  +      _webOutputLabel = DElement(webOutputLabelElement);
       }
     }
   
  
positive.code:       // Delay to give codemirror time to process the mouse event.
        Timer.run(() {
          if (!context.cursorPositionIsWhitespace()) {
            docHandler.generateDoc([_rightDocContentElement, _leftDocPanel]);
          }
        });
      });
  
      docHandler = DocHandler(editor, context);
  
      updateVersions();
  
  
negative.code:     if (!isLegalGistId(gistId)) {
        showHome();
        return;
      } else if (_editableGist.backingGist!.id == gistId) {
        return;
      }
  
  