Remove non-local recipients from local post addressing

They won’t receive local-only posts anyway
so it makes no sense to list them as recipients.

lib/pleroma/web/common_api/utils.ex

@@ -73,13 +73,8 @@ def get_to_and_cc(%{visibility: visibility} = draft) do
     )
   end
 
-  def get_to_and_cc_for_visibility(visibility, follower_collection, parent_actor, mentions)
-      when visibility in ["public", "local"] do
-    scope_addr =
-      case visibility do
-        "public" -> Pleroma.Constants.as_public()
-        "local" -> Utils.as_local_public()
-      end
+  def get_to_and_cc_for_visibility("public", follower_collection, parent_actor, mentions) do
+    scope_addr = Pleroma.Constants.as_public()
 
     to =
       if parent_actor,
@@ -89,6 +84,22 @@ def get_to_and_cc_for_visibility(visibility, follower_collection, parent_actor,
     {to, [follower_collection]}
   end
 
+  def get_to_and_cc_for_visibility("local", follower_collection, parent_actor, mentions) do
+    recipients =
+      if parent_actor,
+        do: Enum.uniq([parent_actor | mentions]),
+        else: mentions
+
+    to = [
+      Utils.as_local_public()
+      | Enum.filter(recipients, fn addr ->
+          String.starts_with?(addr, Pleroma.Web.Endpoint.url() <> "/")
+        end)
+    ]
+
+    {to, [follower_collection]}
+  end
+
   def get_to_and_cc_for_visibility("unlisted", follower_collection, parent_actor, mentions) do
     to =
       if parent_actor,