Remove force summary mode for megatopics for now.

The logic is too hairy and we can't reliably determine
when to force summary mode. Work is underway to improve
perf for megatopics so this will not be required
eventually.

app/assets/javascripts/discourse/lib/transform-post.js.es6

@@ -177,14 +177,9 @@ export default function transformPost(
 
     const postStream = topic.get("postStream");
     postAtts.userFilters = postStream.userFilters;
-
-    if (topic.force_summary_mode) {
-      postStream.set("summary", topic.force_summary_mode);
-    }
-
     postAtts.topicSummaryEnabled = postStream.summary;
     postAtts.topicWordCount = topic.word_count;
-    postAtts.hasTopicSummary = topic.has_summary || topic.force_summary_mode;
+    postAtts.hasTopicSummary = topic.has_summary;
   }
 
   if (postAtts.isDeleted) {

app/serializers/topic_view_serializer.rb

@@ -67,8 +67,7 @@ class TopicViewSerializer < ApplicationSerializer
              :message_bus_last_id,
              :participant_count,
              :destination_category_id,
-             :pm_with_non_human_user,
-             :force_summary_mode,
+             :pm_with_non_human_user
 
   # TODO: Split off into proper object / serializer
   def details
@@ -300,10 +299,6 @@ class TopicViewSerializer < ApplicationSerializer
       object.topic.shared_draft.present?
   end
 
-  def force_summary_mode
-    object.force_summary_mode?
-  end
-
   private
 
   def private_message?(topic)

app/serializers/web_hook_topic_view_serializer.rb

@@ -20,7 +20,6 @@ class WebHookTopicViewSerializer < TopicViewSerializer
     topic_timer
     private_topic_timer
     details
-    force_summary_mode
   }.each do |attr|
     define_method("include_#{attr}?") do
       false

lib/topic_view.rb

@@ -406,13 +406,6 @@ class TopicView
       end
   end
 
-  def force_summary_mode?
-    @force_summary_mode ||=
-      @filter != 'none' &&
-      @topic.closed? &&
-      @topic.posts_count >= (MEGA_TOPIC_POSTS_COUNT * 2)
-  end
-
   protected
 
   def read_posts_set
@@ -490,11 +483,9 @@ class TopicView
     @filtered_posts = unfiltered_posts
 
     # Filters
-    if @filter == 'summary' ||
-       ((@_post_number.blank? || @_post_number.to_i == 1) && force_summary_mode?)
-
+    if @filter == 'summary'
       @filtered_posts = @filtered_posts.summary(@topic.id)
-      @contains_gaps = true unless force_summary_mode?
+      @contains_gaps = true
     end
 
     if @best.present?

spec/components/topic_view_spec.rb

@@ -364,42 +364,6 @@ describe TopicView do
       end
     end
 
-    describe 'when a megalodon topic is closed' do
-      before do
-        @original_const = TopicView::MEGA_TOPIC_POSTS_COUNT
-        TopicView.send(:remove_const, "MEGA_TOPIC_POSTS_COUNT")
-        TopicView.const_set("MEGA_TOPIC_POSTS_COUNT", 1)
-        topic.update!(closed: true)
-        SiteSetting.summary_max_results = 2
-      end
-
-      after do
-        TopicView.send(:remove_const, "MEGA_TOPIC_POSTS_COUNT")
-        TopicView.const_set("MEGA_TOPIC_POSTS_COUNT", @original_const)
-      end
-
-      it 'should be forced into summary mode without gaps' do
-        topic_view = TopicView.new(topic.id, evil_trout, post_number: 1)
-
-        expect(topic_view.contains_gaps?).to eq(false)
-        expect(topic_view.posts).to eq([p5])
-      end
-
-      it 'should not be forced into summary mode if post_number is not blank' do
-        topic_view = TopicView.new(topic.id, evil_trout, post_number: 2)
-
-        expect(topic_view.contains_gaps?).to eq(false)
-        expect(topic_view.posts).to eq([p1, p2, p3])
-      end
-
-      it 'should not be forced into summary mode if filter is none' do
-        topic_view = TopicView.new(topic.id, evil_trout, filter: 'none')
-
-        expect(topic_view.contains_gaps?).to eq(false)
-        expect(topic_view.posts).to eq([p1, p2, p3])
-      end
-    end
-
     it "#restricts to correct topic" do
       t2 = Fabricate(:topic)