Add support for non-public reblogs from ActivityPub (mastodon#9841)

Fix mastodon#9838

Author: Gargron

app/lib/activitypub/activity/announce.rb

@@ -17,7 +17,7 @@ def perform
       uri: @json['id'],
       created_at: @json['published'],
       override_timestamps: @options[:override_timestamps],
-      visibility: original_status.visibility
+      visibility: visibility_from_audience
     )
 
     distribute(status)
@@ -26,6 +26,18 @@ def perform
 
   private
 
+  def visibility_from_audience
+    if equals_or_includes?(@json['to'], ActivityPub::TagManager::COLLECTIONS[:public])
+      :public
+    elsif equals_or_includes?(@json['cc'], ActivityPub::TagManager::COLLECTIONS[:public])
+      :unlisted
+    elsif equals_or_includes?(@json['to'], @account.followers_url)
+      :private
+    else
+      :direct
+    end
+  end
+
   def announceable?(status)
     status.account_id == @account.id || status.public_visibility? || status.unlisted_visibility?
   end

app/models/status.rb

@@ -478,15 +478,15 @@ def increment_counter_caches
     return if direct_visibility?
 
     account&.increment_count!(:statuses_count)
-    reblog&.increment_count!(:reblogs_count) if reblog?
+    reblog&.increment_count!(:reblogs_count) if reblog? && (public_visibility? || unlisted_visibility?)
     thread&.increment_count!(:replies_count) if in_reply_to_id.present? && (public_visibility? || unlisted_visibility?)
   end
 
   def decrement_counter_caches
     return if direct_visibility? || marked_for_mass_destruction?
 
     account&.decrement_count!(:statuses_count)
-    reblog&.decrement_count!(:reblogs_count) if reblog?
+    reblog&.decrement_count!(:reblogs_count) if reblog? && (public_visibility? || unlisted_visibility?)
     thread&.decrement_count!(:replies_count) if in_reply_to_id.present? && (public_visibility? || unlisted_visibility?)
   end