Add enable local public visibility setting for admin

app/models/form/admin_settings.rb

@@ -47,6 +47,7 @@ class Form::AdminSettings
     streaming_other_servers_emoji_reaction
     enable_emoji_reaction
     check_lts_version_only
+    enable_public_unlisted_visibility
   ).freeze
 
   INTEGER_KEYS = %i(
@@ -74,6 +75,7 @@ class Form::AdminSettings
     streaming_other_servers_emoji_reaction
     enable_emoji_reaction
     check_lts_version_only
+    enable_public_unlisted_visibility
   ).freeze
 
   UPLOAD_KEYS = %i(

app/models/status.rb

@@ -449,11 +449,13 @@ class Status < ApplicationRecord
 
   class << self
     def selectable_visibilities
-      visibilities.keys - %w(direct limited)
+      vs = visibilities.keys - %w(direct limited)
+      vs -= %w(public_unlisted) unless Setting.enable_public_unlisted_visibility
+      vs
     end
 
     def selectable_reblog_visibilities
-      %w(unset) + visibilities.keys - %w(direct limited)
+      %w(unset) + selectable_visibilities
     end
 
     def selectable_searchabilities