non-breaking hyphens

[Chong Yidong]

>From the Text Display node in the Emacs manual:

     Some character sets define "no-break" versions of the space and
  hyphen characters, which are used where a line should not be broken.
  Emacs normally displays these characters with special faces
  (respectively, `nobreak-space' and `escape-glyph') to distinguish them
  from ordinary spaces and hyphens.

Hmm---inserting #x2011 (NON-BREAKING HYPHEN) into the buffer does not
show the character in the `escape-glyph' face.  Does anyone know if
#x2011 is indeed the character that manual is referring to?  Is the
manual description obsolete or is the Emacs behavior buggy?