Bug in horizontal recentering (was Re: Gnus v5.8.7 is released)

[Stainless Steel Rat <ratinox@peorth.gweep.net>]

* Stainless Steel Rat <ratinox@peorth.gweep.net>  on Sun, 02 Jul 2000
| Somewhere between 5.8.2 and 5.8.7, summary recentering forgot how to do
| horizontal centering w/ FSF Emacs 20.4.

I found the change point.  5.8.4 does horizontal recentering on C-l in the
summary buffer, 5.8.5 does not.  The bug is in gnus-sum.el, gnus-recenter
function:

(defun gnus-recenter (&optional n)
  "Center point in window and redisplay frame.
Also do horizontal recentering."
  (interactive "P")
  (when (and nil
         ^^^^^^^
             gnus-auto-center-summary
             (not (eq gnus-auto-center-summary 'vertical)))

Will always return nil.  Removing the nil so that the form reads

    (and gnus-auto-center-summary
         (not (eq gnus-auto-center-summary 'vertical)))

fixes it.

Would someone check this into the CVS tree?  Thanks.
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