FIX: Cooked snippet of raw in `Topic.similar_to`.

If we don't cook the raw, we end up trying to match uncooked raw against
`TopicSearchData#search_data` which consists of cooked raw.

app/models/topic.rb

@@ -587,8 +587,12 @@ class Topic < ActiveRecord::Base
     )
 
     if raw.present?
+      cooked = SearchIndexer::HtmlScrubber.scrub(
+        PrettyText.cook(raw[0...MAX_SIMILAR_BODY_LENGTH].strip)
+      )
+
       raw_tsquery = Search.set_tsquery_weight_filter(
-        Search.prepare_data(raw[0...MAX_SIMILAR_BODY_LENGTH].strip),
+        Search.prepare_data(cooked),
         'B'
       )
 

spec/models/topic_spec.rb

@@ -542,6 +542,22 @@ describe Topic do
         expect(Topic.similar_to("unrelated term", "1 2 3 poddle")).to eq([])
       end
 
+      it 'doesnt match numbered lists against numbers in Post#raw' do
+        post.update!(raw: <<~RAW)
+        Internet Explorer 11+ Oct 2013 Google Chrome 32+ Jan 2014 Firefox 27+ Feb 2014 Safari 6.1+ Jul 2012 Safari, iOS 8+ Oct 2014
+        RAW
+
+        post.topic.update!(title: 'Where are we with browser support in 2019?')
+
+        topics = Topic.similar_to("Videos broken in composer", <<~RAW)
+        1. Do something
+        2. Do something else
+        3. Do more things
+        RAW
+
+        expect(topics).to eq([])
+      end
+
       context "secure categories" do
         before do
           category.update!(read_restricted: true)