Adds updating of SortOrder upon moving a document.

Related to U4-1461

src/Umbraco.Core/Persistence/Repositories/ContentRepository.cs

@@ -280,6 +280,8 @@ namespace Umbraco.Core.Persistence.Repositories
             {
                 var parent = Database.First<NodeDto>("WHERE id = @ParentId", new { ParentId = entity.ParentId });
                 entity.Path = string.Concat(parent.Path, ",", entity.Id);
+                var maxSortOrder = Database.ExecuteScalar<int>("SELECT coalesce(max(sortOrder),0) FROM umbracoNode WHERE parentid = @ParentId", new { ParentId = entity.ParentId });
+                entity.SortOrder = maxSortOrder;
             }
 
             var factory = new ContentFactory(NodeObjectTypeId, entity.Id);

src/Umbraco.Core/Services/ContentService.cs

@@ -905,9 +905,13 @@ namespace Umbraco.Core.Services
 		/// <param name="userId">Optional Id of the User moving the Content</param>
 		public void Move(IContent content, int parentId, int userId = -1)
 		{
-            //TODO Verify that SortOrder + Path is updated correctly
-            //TODO Add a check to see if parentId = -20 because then we should change the TrashState
-			
+            //This ensures that the correct method is called if this method is used to Move to recycle bin.
+			if (parentId == -20)
+			{
+			    MoveToRecycleBin(content, userId);
+                return;
+			}
+
 			if (Moving.IsRaisedEventCancelled(new MoveEventArgs<IContent>(content, parentId), this)) 
 				return;