Make outbound transmogrifier aware of edit history

lib/pleroma/web/activity_pub/transmogrifier.ex

@@ -687,6 +687,24 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier do
     |> strip_internal_fields
     |> strip_internal_tags
     |> set_type
+    |> maybe_process_history
+  end
+
+  defp maybe_process_history(%{"formerRepresentations" => %{"orderedItems" => history}} = object) do
+    processed_history =
+      Enum.map(
+        history,
+        fn
+          item when is_map(item) -> prepare_object(item)
+          item -> item
+        end
+      )
+
+    put_in(object, ["formerRepresentations", "orderedItems"], processed_history)
+  end
+
+  defp maybe_process_history(object) do
+    object
   end
 
   #  @doc
@@ -711,6 +729,21 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier do
     {:ok, data}
   end
 
+  def prepare_outgoing(%{"type" => "Update", "object" => %{"type" => objtype} = object} = data)
+      when objtype in Pleroma.Constants.updatable_object_types() do
+    object =
+      object
+      |> prepare_object
+
+    data =
+      data
+      |> Map.put("object", object)
+      |> Map.merge(Utils.make_json_ld_header())
+      |> Map.delete("bcc")
+
+    {:ok, data}
+  end
+
   def prepare_outgoing(%{"type" => "Announce", "actor" => ap_id, "object" => object_id} = data) do
     object =
       object_id
@@ -902,24 +935,7 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier do
   end
 
   def strip_internal_fields(object) do
-    outer = Map.drop(object, Pleroma.Constants.object_internal_fields())
-
-    case outer do
-      %{"formerRepresentations" => %{"orderedItems" => list}} when is_list(list) ->
-        update_in(
-          outer["formerRepresentations"]["orderedItems"],
-          &Enum.map(
-            &1,
-            fn
-              item when is_map(item) -> Map.drop(item, Pleroma.Constants.object_internal_fields())
-              item -> item
-            end
-          )
-        )
-
-      _ ->
-        outer
-    end
+    Map.drop(object, Pleroma.Constants.object_internal_fields())
   end
 
   defp strip_internal_tags(%{"tag" => tags} = object) do