Fix unblock handling

lib/pleroma/web/activity_pub/transmogrifier.ex

@@ -270,6 +270,7 @@ def handle_incoming(
     with %User{local: true} = blocked <- User.get_cached_by_ap_id(blocked),
          %User{} = blocker <- User.get_or_fetch_by_ap_id(blocker),
          {:ok, activity} <- ActivityPub.unblock(blocker, blocked, id, false) do
+      User.unblock(blocker, blocked)
       {:ok, activity}
     else
       e -> :error

test/fixtures/mastodon-unblock-activity.json

@@ -26,8 +26,9 @@
       "type": "Block", 
       "object": "http://localtesting.pleroma.lol/users/lain",
       "nickname": "lain",
-      "id": "http://mastodon.example.org/users/admin#follows/2",
+      "id": "http://mastodon.example.org/users/admin#blocks/2",
       "actor": "http://mastodon.example.org/users/admin" 
     },
-    "actor": "http://mastodon.example.org/users/admin"
+    "actor": "http://mastodon.example.org/users/admin",
+    "id": "http://mastodon.example.org/users/admin#blocks/2/undo"
 }

test/web/activity_pub/transmogrifier_test.exs

@@ -316,7 +316,7 @@ test "it works for incoming unannounces with an existing notice" do
                "http://mastodon.example.org/users/admin/statuses/99542391527669785/activity"
     end
 
-    test "it works for incomming unfollows" do
+    test "it works for incomming unfollows with an existing follow" do
       user = insert(:user)
 
       follow_data =
@@ -360,7 +360,7 @@ test "it works for incoming blocks" do
       assert User.blocks?(blocker, user)
     end
 
-    test "it works for incoming unblocks" do
+    test "it works for incoming unblocks with an existing block" do
       user = insert(:user)
 
       block_data =
@@ -379,11 +379,11 @@ test "it works for incoming unblocks" do
       assert data["type"] == "Undo"
       assert data["object"]["type"] == "Block"
       assert data["object"]["object"] == user.ap_id
-      assert data["actor"] == "https://mastodon.example.org/users/admin"
+      assert data["actor"] == "http://mastodon.example.org/users/admin"
 
       blocker = User.get_by_ap_id(data["actor"])
 
-      refute User.blocks?(blocker, user.ap_id)
+      refute User.blocks?(blocker, user)
     end
   end