Rollback button added.

src/js/notebook/js/actions.js

@@ -892,6 +892,19 @@ define([
                 return false;
             }
         },
+        'rollback':{
+            cmd: i18n.msg._('rollback notebook'),
+            help: i18n.msg._("Revenir à une version précédente du notebook"),
+            icon: 'fa-undo',
+            help_index: 'fzz',
+            handler: function (env, event) {
+                env.notebook.basthonGUI.selectCheckpoint();
+                if(event){
+                    event.preventDefault();
+                }
+                return false;
+            }
+        },
     };
 
     // private stuff that prepend `jupyter-notebook:` to actions names

src/js/notebook/js/maintoolbar.js

@@ -40,6 +40,10 @@ define([
             ['jupyter-notebook:share-notebook'],
             'share_notebook'
           ],
+          [
+            ['jupyter-notebook:rollback'],
+            'rollback'
+          ],
           [
             ['jupyter-notebook:insert-cell-below'],
             'insert_above_below'],

src/js/notebook/js/menubar.js

@@ -213,6 +213,7 @@ define([
             '#find_and_replace' : 'find-and-replace',
             '#save_checkpoint': 'save-notebook',
             '#share_notebook': 'share-notebook',
+            '#rollback': 'rollback',
             '#shutdown_kernel': 'confirm-shutdown-kernel',
             '#restart_kernel': 'confirm-restart-kernel',
             '#restart_clear_output': 'confirm-restart-kernel-and-clear-output',