reduce saving heads times in fetching revisions. git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@9141 e93f8b46-1217-0410-a6f0-8f06a7374b81
reduce saving heads times in fetching revisions. git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@9141 e93f8b46-1217-0410-a6f0-8f06a7374b81