Merge branch 'issue_13365' into 'master'

Load all blob data when highlighting content for git-blame.

Fixes #13365

See merge request !2792

lib/gitlab/blame.rb

@@ -40,6 +40,7 @@ module Gitlab
     end
 
     def highlighted_lines
+      @blob.load_all_data!(repository)
       @highlighted_lines ||= Gitlab::Highlight.highlight(@blob.name, @blob.data).lines
     end