Fix duplication of code when navigation back and forth

app/assets/javascripts/editor/editor.js.erb

@@ -782,8 +782,9 @@ configureEditors: function () {
     this.showFirstFile();
     this.resizeAceEditors();
 
-    $(window).on("beforeunload", this.unloadAutoSave.bind(this));
+    window.addEventListener("beforeunload", this.unloadAutoSave.bind(this));
+    window.addEventListener("page:before-change", this.unloadAutoSave.bind(this));
     // create autosave when the editor is opened the first time
-    // TODO: this.autosave();
+    this.autosave();
   }
 };

app/views/exercises/implement.html.slim

@@ -1,7 +1,7 @@
 - content_for :head do
   // Force a full page reload, see https://github.com/turbolinks/turbolinks/issues/326.
      Otherwise, lti_parameters might be nil
-  meta name='turbolinks-visit-control' content='reload'
+  meta name="turbolinks-cache-control" content="no-cache"
 
 .row
   #editor-column.col-md-12