Speed up searching for text references a bit

If a node is ignored there's no need for searching for a given pattern.
In turn, when searching for the pattern there's no need to construct a
MatchData object as we only care about presence (or lack thereof), not
the resulting matches.

In terms of performance this cuts down about 200 ms when loading
issue #2164 locally, though this varies a bit depending on system load.

1 files changed, 4 insertions, 4 deletions

diff --git a/lib/gitlab/markdown/reference_filter.rb b/lib/gitlab/markdown/reference_filter.rb
index adaca78ba27..a4c560f578c 100644
--- a/lib/gitlab/markdown/reference_filter.rb
+++ b/lib/gitlab/markdown/reference_filter.rb
@@ -15,7 +15,7 @@ module Gitlab
       LazyReference = Struct.new(:klass, :ids) do
         def self.load(refs)
           lazy_references, values = refs.partition { |ref| ref.is_a?(self) }
-          
+
           lazy_values = lazy_references.group_by(&:klass).flat_map do |klass, refs|
             ids = refs.flat_map(&:ids)
             klass.where(id: ids)
@@ -107,10 +107,10 @@ module Gitlab
         return doc if project.nil?
 
         search_text_nodes(doc).each do |node|
-          content = node.to_html
-
-          next unless content.match(pattern)
           next if ignored_ancestry?(node)
+          next unless node.text =~ pattern
+
+          content = node.to_html
 
           html = yield content