ruby-additional.el: track by marker

* misc/ruby-additional.el (ruby-encode-unicode): use marker
  instead of offset to track insertion.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46994 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

misc/ruby-additional.el

@@ -111,6 +111,7 @@ Emacs to Ruby."
      (defun ruby-encode-unicode (beg end)
        "Convert non-ascii string in the given region to \\u{} form."
        (interactive "r")
+       (setq end (set-marker (make-marker) end))
        (goto-char beg)
        (while (and (< (point) end)
 		   (re-search-forward "\\Ca+" end t))