anchor.diff:      } else {
         // Show the existing sharing info.
         _text.text = 'Share the DartPad link or view the source at gist.github.com.';
  -
  +      _textArea.style.display = 'none';
  +      
         MutableGist gist = gistContainer.mutableGist;
   
         content.add(_div);
  
positive.code:     _shareButton.disabled = true;
  
      // TODO: Show a spinner.
      gistController.shareAnon(summary: _dialog.value).then((_) {
        _switchTo(aboutToShare: false);
      }).whenComplete(() {
        _shareButton.disabled = false;
  
negative.code:       // Show 'about to share'.
        _text.text = 'Sharing this pad will create a permanent, publicly visible '
            'copy on gist.github.com.';
        _textArea.defaultValue = _summary;
        _textArea.style.display = 'block';
        
        buttonArea.add(_cancelButton);
        buttonArea.add(new SpanElement()..attributes['flex'] = '');
  