Raise SendingContentModel event for each element type in blocklist (#10869)

Co-authored-by: Nikolaj <nel@umbraco.dk>

src/Umbraco.Web/WebApi/Filters/OutgoingEditorModelEventAttribute.cs

@@ -1,10 +1,8 @@
-using System;
+using System.Collections;
 using System.Net.Http;
 using System.Web.Http.Filters;
-using Umbraco.Core;
 using Umbraco.Web.Composing;
 using Umbraco.Web.Editors;
-using Umbraco.Web.Models.ContentEditing;
 
 namespace Umbraco.Web.WebApi.Filters
 {
@@ -23,18 +21,37 @@ namespace Umbraco.Web.WebApi.Filters
             if (actionExecutedContext.Response.Content is ObjectContent objectContent)
             {
                 var model = objectContent.Value;
-
                 if (model != null)
                 {
-                    var args = new EditorModelEventArgs(
-                        model,
-                        Current.UmbracoContext);
-                    EditorModelEventManager.EmitEvent(actionExecutedContext, args);
-                    objectContent.Value = args.Model;
+                    if (model is IDictionary modelDict)
+                    {
+                        foreach (var entity in modelDict)
+                        {
+                            if (entity is DictionaryEntry entry)
+                            {
+                                var args = CreateArgs(entry.Value);
+                                EditorModelEventManager.EmitEvent(actionExecutedContext, args);
+                                entry.Value = args.Model;
+                            }
+                        }
+                    }
+                    else
+                    {
+                        var args = CreateArgs(model);
+                        EditorModelEventManager.EmitEvent(actionExecutedContext, args);
+                        objectContent.Value = args.Model;
+                    }
                 }
             }
 
             base.OnActionExecuted(actionExecutedContext);
         }
+
+        private EditorModelEventArgs CreateArgs(object model)
+        {
+            return new EditorModelEventArgs(
+                model,
+                Current.UmbracoContext);
+        }
     }
 }