Merge branch 'pj/fix-emacs-style' into 'master'

Fix syntax coloring on emacs

See merge request gitlab-org/gitlab-ce!29844

lib/gitlab/database/migration_helpers.rb

@@ -225,7 +225,10 @@ module Gitlab
       # here is based on Rails' foreign_key_name() method, which unfortunately
       # is private so we can't rely on it directly.
       def concurrent_foreign_key_name(table, column)
-        "fk_#{Digest::SHA256.hexdigest("#{table}_#{column}_fk").first(10)}"
+        identifier = "#{table}_#{column}_fk"
+        hashed_identifier = Digest::SHA256.hexdigest(identifier).first(10)
+
+        "fk_#{hashed_identifier}"
       end
 
       # Long-running migrations may take more than the timeout allowed by