Use a site setting for maximum summary results

app/models/post.rb

@@ -240,7 +240,7 @@ class Post < ActiveRecord::Base
   end
 
   def self.summary
-    where(["(post_number = 1) or (percent_rank <= ?)", SiteSetting.summary_percent_filter.to_f / 100.0]).limit(100)
+    where(["(post_number = 1) or (percent_rank <= ?)", SiteSetting.summary_percent_filter.to_f / 100.0]).limit(SiteSetting.summary_max_results)
   end
 
   def update_flagged_posts_count

config/locales/server.en.yml

@@ -695,6 +695,8 @@ en:
     summary_posts_required: "Minimum posts in a topic before 'Summarize This Topic' is enabled"
     summary_likes_required: "Minimum likes in a topic before 'Summarize This Topic' is enabled"
     summary_percent_filter: "When a user clicks 'Summarize This Topic', show the top % of posts"
+    summary_max_results: "Maximum posts returned by 'Summary This Topic'"
+
     enable_private_messages: "Allow trust level 1 users to create private messages and reply to private messages"
 
     enable_long_polling: "Message bus used for notification can use long polling"

config/site_settings.yml

@@ -713,6 +713,7 @@ uncategorized:
   summary_posts_required: 50
   summary_likes_required: 1
   summary_percent_filter: 20
+  summary_max_results: 100
 
   # View heat thresholds
   topic_views_heat_low: