[Info mode] Bad wrapping of @xrefs

[Jesper Harder]

Hi!

In Info mode @xrefs are sometimes wrapped incorrectly.  

For an example see the "Other Marks" section in the Gnus manual.  In
CVS Emacs the first @xref is incorrectly aligned at the left margin:

,----
|    There are some marks that have nothing to do with whether the
| article is read or not.
| 
|    * You can set a bookmark in the current article.  Say you are
|      reading a long thesis on cats' urinary tracts, and have to go
|      home for dinner before you've finished reading the thesis.  You
|      can then set a bookmark in the article, and Gnus will jump to
|      this bookmark the next time it encounters the article.  See
| Setting Marks.
| 
`----

The same Info file is displayed correctly in both the stand-alone Info
viewer and Emacs 21.3.


In GNU Emacs 21.3.50.71 (i686-pc-linux-gnu)
 of 2003-05-02 on defun.localdomain
configured using `configure '--with-gtk''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.iso88591
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t