PostQueryBuilder#normalize_query: don't normalize aliases by default.

`normalize_query` is used in certain places on the post index page where
we don't want to pay the cost of looking up tag aliases (namely inside
fast_count, in post_search_count_js, and in tag change notices). Don't
normalize aliases by default unless we need to.

app/logical/post_query_builder.rb

@@ -746,7 +746,7 @@ class PostQueryBuilder
       end
     end
 
-    def normalize_query(normalize_aliases: true, sort: true)
+    def normalize_query(normalize_aliases: false, sort: true)
       tags = split_query
       tags = tags.map { |t| Tag.normalize_name(t) }
       tags = TagAlias.to_aliased(tags) if normalize_aliases

app/models/saved_search.rb

@@ -136,7 +136,7 @@ class SavedSearch < ApplicationRecord
       def queries_for(user_id, label: nil, options: {})
         searches = SavedSearch.where(user_id: user_id)
         searches = searches.labeled(label) if label.present?
-        queries = searches.pluck(:query).map { |query| PostQueryBuilder.new(query).normalize_query(sort: true) }
+        queries = searches.pluck(:query).map { |query| PostQueryBuilder.new(query).normalize_query(normalize_aliases: true, sort: true) }
         queries.sort.uniq
       end
     end
@@ -146,7 +146,7 @@ class SavedSearch < ApplicationRecord
     end
 
     def normalize_query
-      self.query = PostQueryBuilder.new(query).normalize_query(sort: false)
+      self.query = PostQueryBuilder.new(query).normalize_query(normalize_aliases: true, sort: false)
     end
   end
 

test/unit/post_query_builder_test.rb

@@ -943,7 +943,8 @@ class PostQueryBuilderTest < ActiveSupport::TestCase
       assert_equal("foo", PostQueryBuilder.new(" foo ").normalize_query)
       assert_equal("foo", PostQueryBuilder.new("FOO").normalize_query)
       assert_equal("foo", PostQueryBuilder.new("foo foo").normalize_query)
-      assert_equal("grey", PostQueryBuilder.new("gray").normalize_query)
+      assert_equal("gray", PostQueryBuilder.new("gray").normalize_query)
+      assert_equal("grey", PostQueryBuilder.new("gray").normalize_query(normalize_aliases: true))
       assert_equal("aaa bbb", PostQueryBuilder.new("bbb aaa").normalize_query)
     end
   end