 If this function is called with a prefix argument, only the current line is
 marked, even if it is a directory."
   (interactive "P")
+  (setq arg (svn-status-possibly-negate-meaning-of-arg arg 'svn-status-set-user-mark))
   (let ((info (svn-status-get-line-information)))
     (if info
         (progn

If this function is called with a prefix argument, only the current line is
unmarked, even if is a directory."
  (interactive "P")
  (let ((info (svn-status-get-line-information)))
    (if info
        (progn

      (insert
       (format "%d Unmodified file(s) are hidden - press `_' to toggle hiding\n"
               unmodified-count)))
    (when (> custom-hide-count 0)
      (insert
       (format "%d file(s) are hidden via the svn-status-custom-hide-function\n"
               custom-hide-count)))
