Save current state after autosave is finished

[MAILPOET-1976]

assets/js/src/newsletter_editor/components/history.js

@@ -4,9 +4,32 @@ import Marionette from 'backbone.marionette';
 var Module = {};
 
 Module.HistoryView = Marionette.View.extend({
+  MAX_HISTORY_STATES: 25,
+
+  model: {
+    states: [], // from newest
+    currentStateIndex: 0,
+  },
+
   getTemplate: function getTemplate() {
     return window.templates.history;
   },
+
+  initialize: function initialize() {
+    App.getChannel().on('afterEditorSave', this.setCurrentState, this);
+  },
+
+  setCurrentState: function setCurrentState(json) {
+    if (!json || !json.body) {
+      return;
+    }
+    if (this.model.currentStateIndex > 0) {
+      this.model.states.splice(0, this.model.currentStateIndex);
+    }
+    this.model.states.unshift(json.body);
+    this.model.currentStateIndex = 0;
+    this.model.states.length = Math.min(this.model.states.length, this.MAX_HISTORY_STATES);
+  },
 });
 
 App.on('start', function appStart(StartApp) {