trailing whitespace in calendar

[luis o silva]

Dear Emacs users,

In my init.el, I have:

***************************
(add-hook 'today-visible-calendar-hook ; when displaying calendar
          (lambda ()
            (setq show-trailing-whitespace nil)))

**************************

so that the calendar buffer does not show trailing
whitespaces. Unfortunately, after updating emacs to the latest version
(25.1), this stoped working and now trailing whitespaces are shown in
the calendar buffer. Do you know why this is not working now?

Thank you very much for any hint.

Regards,
luis

-- 
luis octavio silva pereyra.
IIMAS-UNAM
Física Matemática
Circuito Escolar s/n
Cd. Universitaria
04510 México, D.F.
http://www.iimas.unam.mx/silva/