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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Redisplay issue
Date: Thu, 03 Dec 2015 12:23:14 +0200
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> Date: Thu, 3 Dec 2015 00:09:04 -0800
> From: Yuan MEI <yuan.mei.list@gmail.com>
> Cc: emacs-devel <emacs-devel@gnu.org>
> 
> Emacs.Geometry: 100x59+2+2
> 
> Without Cairo:
>   Width: 818
>   Height: 1022
> 
> With Cairo:
>   Width: 818
>   Height: 962
> 
> So for the same screen height, I gain 4 lines of text when using Cairo.

So what is smaller with Cairo?  The letters, the gap between the
lines, the frame decorations?  Where do those extra 60 pixels come
from?