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Update lineitems in shipment when lineitems in cart change

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ExtendedValidateLineItemsActivity.cs

using System.Linq;

    using EPiServer.Commerce.Order;

    using Mediachase.Commerce.Orders;
    using Mediachase.Commerce.Workflow.Activities;
    using Mediachase.Commerce.WorkflowCompatibility;

    public class ExtendedValidateLineItemsActivity : ValidateLineItemsActivity
    {
        /// <summary>
        /// Called by the workflow runtime to execute an activity.
        /// </summary>
        /// <param name="executionContext">The <see cref="T:Mediachase.Commerce.WorkflowCompatibility.ActivityExecutionContext" /> to associate with this <see cref="T:Mediachase.Commerce.WorkflowCompatibility.Activity" /> and execution.</param>
        /// <returns>
        /// The <see cref="T:Mediachase.Commerce.WorkflowCompatibility.ActivityExecutionStatus" /> of the run task, which determines whether the activity remains in the executing state, or transitions to the closed state.
        /// </returns>
        protected override ActivityExecutionStatus Execute(ActivityExecutionContext executionContext)
        {
            // Validate the properties at runtime
            this.ValidateRuntime();

            // Process Shipment now
            this.UpdateShipment();

            // Retun the closed status indicating that this activity is complete.
            return base.Execute(executionContext);
        }

        /// <summary>
        /// Updates the first shipment with the amount for the lineitem in the cart.
        /// </summary>
        private void UpdateShipment()
        {
            OrderForm orderForm;

            if (this.OrderGroup.OrderForms.Count > 0)
            {
                orderForm = this.OrderGroup.OrderForms[0];
            }
            else
            {
                orderForm = new OrderForm { Name = this.OrderGroup.Name };
                this.OrderGroup.OrderForms.Add(orderForm);
            }

            // Create a new shipment if there is no shipment.
            Shipment shipment = orderForm.Shipments.FirstOrDefault() ?? orderForm.Shipments.AddNew();

            // Remove items in the shipment that are not in the Cart anymore
            foreach (ILineItem shipmentItem in shipment.LineItems)
            {
                LineItem lineItem = orderForm.LineItems.FindItem(shipmentItem.LineItemId);

                if (lineItem != null)
                {
                    continue;
                }

                int shipmentItemIndex = shipment.LineItems.ToList().IndexOf(shipmentItem);
                shipment.RemoveLineItemIndex(shipmentItemIndex);
            }

            for (int i = 0; i < orderForm.LineItems.Count; i++)
            {
                LineItem lineItem = orderForm.LineItems[i];

                int lineItemIndex = orderForm.LineItems.IndexOf(lineItem);

                // If the item already exists, update or delete if the quantity is 0
                if (shipment.LineItemIndexes.Contains(lineItemIndex.ToString()))
                {
                    if (lineItem.Quantity == 0)
                    {
                        shipment.RemoveLineItemIndex(lineItemIndex);
                    }
                    else
                    {
                        shipment.SetLineItemQuantity(lineItemIndex, lineItem.Quantity);
                    }

                    continue;
                }

                // If the item does not exits, add
                shipment.AddLineItemIndex(lineItemIndex, lineItem.Quantity);
            }

            this.OrderGroup.AcceptChanges();
        }
    }

SiteInitialization.cs

    using System.Linq;

    using EPiServer.Commerce.Order;
    using Mediachase.Commerce.Core.Features;
    using Mediachase.Commerce.Markets;
    using Mediachase.Commerce.Workflow;
    using Mediachase.Commerce.Workflow.Activities;
    using Mediachase.Commerce.Workflow.Activities.OrderGroupActivities;

    [ModuleDependency(typeof(EPiServer.Commerce.Initialization.InitializationModule))]
    public class SiteInitialization : IConfigurableModule
    {
        public void Initialize(InitializationEngine context)
        {
        }
        
        public void ConfigureContainer(ServiceConfigurationContext context)
        {
            context.Container.Configure(c =>
            {
                c.For<ValidateLineItemsActivity>().Use<ExtendedValidateLineItemsActivity>();
            });
        }
        
        public void Uninitialize(InitializationEngine context) { }
    }