[FIX] pos_restaurant: splitbill would crash on reloaded orders due to not reloading orderline ids

addons/point_of_sale/static/src/js/models.js

@@ -874,6 +874,8 @@ openerp.point_of_sale.load_models = function load_models(instance, module){ //mo
             this.price = json.price_unit;
             this.set_discount(json.discount);
             this.set_quantity(json.qty);
+            this.id    = json.id;
+            orderline_id = Math.max(this.id+1,orderline_id)
         },
         clone: function(){
             var orderline = new module.Orderline({},{
@@ -997,6 +999,7 @@ openerp.point_of_sale.load_models = function load_models(instance, module){ //mo
                 price_unit: this.get_unit_price(),
                 discount: this.get_discount(),
                 product_id: this.get_product().id,
+                id: this.id,
             };
         },
         //used to create a json of the ticket, to be sent to the printer

addons/pos_restaurant/static/src/js/splitbill.js

@@ -167,7 +167,7 @@ openerp.pos_restaurant.load_splitbill = function(instance, module){
         template: 'SplitbillButton',
         button_click: function(){
             if(this.pos.get_order().get_orderlines().length > 0){
-                self.gui.show_screen('splitbill');
+                this.gui.show_screen('splitbill');
             }
         },
     });