activescaffold/active_scaffold — pull request #145 by courtland (2012-03-06 16:38:25+00:00)
Title: Performance: do not rebuild sorting everytime column_class is called

Cherry-picking one of volker's performance improvements.: https://github.com/vhochstein/active_scaffold/commit/13a507b62b0944f157f84f7f0495c90a2232b8f8