ruby-additional.el: track by marker
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46994 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
ruby-additional.el: track by marker
instead of offset to track insertion.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46994 b2dd03c8-39d4-4d8f-98ff-823fe69b080e