FIX: fancy topic title must fit into column

app/models/topic.rb

@@ -37,6 +37,10 @@ class Topic < ActiveRecord::Base
     @max_sort_order ||= (2**31) - 1
   end
 
+  def self.max_fancy_title_length
+    400
+  end
+
   def featured_users
     @featured_users ||= TopicFeaturedUsers.new(self)
   end
@@ -304,7 +308,8 @@ class Topic < ActiveRecord::Base
   def self.fancy_title(title)
     escaped = ERB::Util.html_escape(title)
     return unless escaped
-    Emoji.unicode_unescape(HtmlPrettify.render(escaped))
+    fancy_title = Emoji.unicode_unescape(HtmlPrettify.render(escaped))
+    fancy_title.length > Topic.max_fancy_title_length ? title : fancy_title
   end
 
   def fancy_title

spec/models/topic_spec.rb

@@ -329,6 +329,14 @@ describe Topic do
         expect(topic.fancy_title).to eq("this is another edge case")
       end
 
+      it "works with long title that results in lots of entities" do
+        long_title = "NEW STOCK PICK: PRCT - LAST PICK UP 233%, NNCO.................................................................................................................................................................. ofoum"
+        topic.title = long_title
+
+        expect { topic.save! }.to_not raise_error
+        expect(topic.fancy_title).to eq(long_title)
+      end
+
       context 'readonly mode' do
         before do
           Discourse.enable_readonly_mode