Fixes: U4-4055 List View document types still display children in content tree

src/Umbraco.Core/Models/UmbracoEntityExtensions.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Web.UI.WebControls;
+using Umbraco.Core.Models.EntityBase;
+
+namespace Umbraco.Core.Models
+{
+    internal static class UmbracoEntityExtensions
+    {
+
+        public static object GetAdditionalDataValueIgnoreCase(this IUmbracoEntity entity, string key, object defaultVal)
+        {
+            if (entity.AdditionalData.ContainsKeyIgnoreCase(key) == false) return defaultVal;
+            return entity.AdditionalData.GetValueIgnoreCase(key, defaultVal);
+        }
+
+        public static bool IsContainer(this IUmbracoEntity entity)
+        {
+            if (entity.AdditionalData.ContainsKeyIgnoreCase("IsContainer") == false) return false;
+            var val = entity.AdditionalData.GetValueIgnoreCase("IsContainer", null);
+            if (val is bool && (bool) val)
+            {
+                return true;
+            }
+            return false;
+        }
+
+    }
+}