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From: Glenn Morris <rgm@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: set-face-attribute and floating point :height values
Date: Mon, 31 Jan 2011 15:42:21 -0500
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To: Giorgos Keramidas <keramida@ceid.upatras.gr>
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Giorgos Keramidas wrote:
>   (set-face-attribute 'default nil :family "DejaVu Sans Mono" :height 1.4)
>
> a debugger pops up with the following backtrace:
>
>     Debugger entered--Lisp error: (error "Invalid default face height" 1.4)

You're saying: make the default font height be 1.4 times the default
font height. The default font height must be absolute.

http://debbugs.gnu.org/cgi/bugreport.cgi?bug=2659