bug#7097: 24.0.50; whitespace-style lines-tail no longer works

[Óscar Fuentes]

emacs -Q

In *scratch* buffer eval this:
(setq whitespace-style '(lines-tail))
(whitespace-mode)

Now type a line of text with mode than 80 characteres.

Until recently, the characters after the 80th column were highlighted
with a prominent background color, which is the documented behavior.


In GNU Emacs 24.0.50.1 (x86_64-unknown-linux-gnu, X toolkit)
 of 2010-09-16 on qcore
Windowing system distributor `The X.Org Foundation', version 11.0.10706000
configured using `configure  '--without-toolkit-scroll-bars' 
'--with-x-toolkit=lucid''

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.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t