Recentering bug in gnus-xmas - FIX

[sperber@informatik.uni-tuebingen.de (Michael Sperber [Mr. Preprocessor])]

Steve L Baur noticed this awhile ago.  He wrote:

>1.  Setting gnus-auto-center-summary to t (the default) produces bogus
>    behavior on XEmacs 19.14 -- it warps the cursor off of the last
>    article in the *Summary* buffer all too often.

This is due to the fact that window-height doesn't really report what
you want.

The patch is relative to 0.80.  Our ftp gateway is shut down, so I'm
not sure the bug's still there in the current sgnus

Cheers =8-} Mike

*** lisp/gnus-xmas.el~	Mon Apr 29 04:32:20 1996
--- lisp/gnus-xmas.el	Sat May 11 19:03:36 1996
***************
*** 110,119 ****
  			 gnus-summary-selected-face))))
  
  (defun gnus-xmas-summary-recenter ()
!   (let* ((top (cond ((< (window-height) 4) 0)
! 		    ((< (window-height) 7) 1)
  		    (t 2)))
! 	 (height (- (window-height) 2))
  	 (bottom (save-excursion (goto-char (point-max))
  				 (forward-line (- height))
  				 (point)))
--- 110,119 ----
  			 gnus-summary-selected-face))))
  
  (defun gnus-xmas-summary-recenter ()
!   (let* ((top (cond ((< (window-displayed-height) 4) 0)
! 		    ((< (window-displayed-height) 7) 1)
  		    (t 2)))
! 	 (height (- (window-displayed-height) 2))
  	 (bottom (save-excursion (goto-char (point-max))
  				 (forward-line (- height))
  				 (point)))