Simplify notification filtering settings further

lib/pleroma/notification.ex

@@ -550,9 +550,7 @@ defmodule Pleroma.Notification do
     [
       :self,
       :invisible,
-      :from_followers,
-      :from_following,
-      :from_strangers,
+      :block_from_strangers,
       :recently_followed
     ]
     |> Enum.find(&skip?(&1, activity, user))
@@ -572,35 +570,15 @@ defmodule Pleroma.Notification do
   end
 
   def skip?(
-        :from_followers,
+        :block_from_strangers,
         %Activity{} = activity,
-        %User{notification_settings: %{from_followers: false}} = user
-      ) do
-    actor = activity.data["actor"]
-    follower = User.get_cached_by_ap_id(actor)
-    User.following?(follower, user)
-  end
-
-  def skip?(
-        :from_strangers,
-        %Activity{} = activity,
-        %User{notification_settings: %{from_strangers: false}} = user
+        %User{notification_settings: %{block_from_strangers: true}} = user
       ) do
     actor = activity.data["actor"]
     follower = User.get_cached_by_ap_id(actor)
     !User.following?(follower, user)
   end
 
-  def skip?(
-        :from_following,
-        %Activity{} = activity,
-        %User{notification_settings: %{from_following: false}} = user
-      ) do
-    actor = activity.data["actor"]
-    followed = User.get_cached_by_ap_id(actor)
-    User.following?(user, followed)
-  end
-
   # To do: consider defining recency in hours and checking FollowingRelationship with a single SQL
   def skip?(:recently_followed, %Activity{data: %{"type" => "Follow"}} = activity, %User{} = user) do
     actor = activity.data["actor"]

lib/pleroma/user/notification_setting.ex

@@ -10,18 +10,14 @@ defmodule Pleroma.User.NotificationSetting do
   @primary_key false
 
   embedded_schema do
-    field(:from_followers, :boolean, default: true)
-    field(:from_following, :boolean, default: true)
-    field(:from_strangers, :boolean, default: true)
+    field(:block_from_strangers, :boolean, default: false)
     field(:privacy_option, :boolean, default: false)
   end
 
   def changeset(schema, params) do
     schema
     |> cast(prepare_attrs(params), [
-      :from_followers,
-      :from_following,
-      :from_strangers,
+      :block_from_strangers,
       :privacy_option
     ])
   end

lib/pleroma/web/api_spec/schemas/account.ex

@@ -57,9 +57,7 @@ defmodule Pleroma.Web.ApiSpec.Schemas.Account do
           notification_settings: %Schema{
             type: :object,
             properties: %{
-              from_followers: %Schema{type: :boolean},
-              from_following: %Schema{type: :boolean},
-              from_strangers: %Schema{type: :boolean},
+              block_from_strangers: %Schema{type: :boolean},
               privacy_option: %Schema{type: :boolean}
             }
           },
@@ -122,9 +120,7 @@ defmodule Pleroma.Web.ApiSpec.Schemas.Account do
         "unread_conversation_count" => 0,
         "tags" => [],
         "notification_settings" => %{
-          "from_followers" => true,
-          "from_following" => true,
-          "from_strangers" => true,
+          "block_from_strangers" => false,
           "privacy_option" => false
         },
         "relationship" => %{