anchor.diff:      }
   
       if (tabName == 'solution') {
  +      ga?.sendEvent('view', 'solution');
         _userHasSeenSolution = true;
       }
   
  
positive.code:         tabController.selectTab('solution', force: true);
        });
        hintBox.showElements([hintElement, showSolutionButton]);
      })
        ..hidden = true;
  
  
negative.code: /// snippet against a desired result.
  class NewEmbed {
    final NewEmbedOptions options;
  
    var _executionButtonCount = 0;
    DisableableButton executeButton;
    DisableableButton reloadGistButton;
    DisableableButton formatButton;
  