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From: Shenghuo ZHU <zsh@cs.rochester.edu>
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Subject: Re: gnus-auto-center-summary off-center
Date: 25 Sep 1999 01:23:31 -0400
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>>>>> "Rat" == Stainless Steel Rat <ratinox@peorth.gweep.net> writes:

Rat> * Shenghuo ZHU <zsh@cs.rochester.edu>  on Fri, 24 Sep 1999
Rat> | Now, Gnus predicts a bit smaller number, so a blank line may be displayed
Rat> | in the summary buffer.

Rat> Does Gnus use `window-displayed-height' in this calculation
Rat> instead of window-height?  It should.  At least as far as XEmacs
Rat> is concerned, use window-height for geometry calculations and
Rat> window-displayed-height to get the actual number of lines of text
Rat> displayed in the window -- regardless of variable text sizes.

Yes, it is used. 

Rat> What function is responsible for this prediction?

gnus-xmas-summary-recenter in gnus-xmas.el.

-- 
Shenghuo ZHU