Do not load translation for posts already in correct locale

Author: nattsw

plugin.rb

@@ -44,7 +44,8 @@ module ::DiscourseTranslator
 
   register_modifier(:basic_post_serializer_cooked) do |cooked, serializer|
     if !SiteSetting.experimental_topic_translation ||
-         serializer.scope.request.params["show"] == "original"
+         serializer.scope.request.params["show"] == "original" ||
+         serializer.object.detected_locale == I18n.locale.to_s.gsub("_", "-")
       cooked
     else
       translation = serializer.object.translation_for(I18n.locale)

spec/serializers/post_serializer_spec.rb

@@ -106,6 +106,14 @@ def serialize_post(guardian_user: user, params: {})
       expect(serialize_post(params: { "show" => "derp" }).cooked).to eq("こんにちは")
     end
 
+    it "does not return translated_cooked when post is already in correct locale" do
+      I18n.locale = "ja"
+      post.set_detected_locale("ja")
+      post.set_translation("ja", "こんにちは")
+
+      expect(serialize_post.cooked).to eq(post.cooked)
+    end
+
     it "returns translated content based on locale" do
       I18n.locale = "ja"
       post.set_translation("ja", "こんにちは")