Do not boost if group is blocking poster

lib/pleroma/web/activity_pub/utils.ex

@@ -937,13 +937,19 @@ defmodule Pleroma.Web.ActivityPub.Utils do
   end
 
   def maybe_handle_group_posts(activity) do
+    poster = User.get_cached_by_ap_id(activity.actor)
+
     mentions =
       activity.data["to"]
       |> Enum.filter(&(&1 != activity.actor))
 
     mentioned_local_groups =
       User.get_all_by_ap_id(mentions)
-      |> Enum.filter(&(&1.actor_type == "Group" and &1.local))
+      |> Enum.filter(fn user ->
+        user.actor_type == "Group" and
+          user.local and
+          not User.blocks?(user, poster)
+      end)
 
     mentioned_local_groups
     |> Enum.each(fn group ->