[MERGE] forward port branch 9.0 up to b73518f

addons/point_of_sale/static/src/js/screens.js

@@ -280,7 +280,7 @@ var ScaleScreenWidget = ScreenWidget.extend({
             return self.pos.proxy.scale_read().then(function(weight){
                 self.set_weight(weight.weight);
             });
-        },{duration:50, repeat: true});
+        },{duration:150, repeat: true});
 
     },
     get_product: function(){

addons/web/static/src/js/views/form_relational_widgets.js

@@ -1208,7 +1208,7 @@ var One2ManyListView = X2ManyListView.extend({
         this.dataset.x2m.internal_dataset_changed = false;
 
         var self = this;
-        return this.save_edition().done(function () {
+        return this.save_edition(true).done(function () {
             if (self._dataset_changed) {
                 self.dataset.trigger('dataset_changed');
             }

addons/web/static/src/js/views/list_view_editable.js

@@ -448,7 +448,7 @@ ListView.include(/** @lends instance.web.ListView# */{
     /**
      * @return {jQuery.Deferred}
      */
-    save_edition: function () {
+    save_edition: function (cancel_onfail) {
         var self = this;
         return self.saving_mutex.exec(function() {
             if (!self.editor.is_editing()) {
@@ -483,7 +483,9 @@ ListView.include(/** @lends instance.web.ListView# */{
                             return {created: created, record: record};
                         });
                 }, function() {
-                    return self.cancel_edition();
+                    if (cancel_onfail) {
+                        return self.cancel_edition();
+                    }
                 });
             });
         });