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Re: master fe7c015b20: Support XFCE in wallpaper.el

From: Eli Zaretskii
Subject: Re: master fe7c015b20: Support XFCE in wallpaper.el
Date: Tue, 27 Sep 2022 19:40:32 +0300 
> From: Stefan Kangas <stefankangas@gmail.com>
> Date: Tue, 27 Sep 2022 12:19:32 -0400
> Cc: Thierry Volpiatto <thievol@posteo.net>, Po Lu <luangruo@yahoo.com>,
>  emacs-devel@gnu.org
> 
> +If the value is a function, it will be evaluated only when
> +needed.  For example:

What does it mean "only when needed" in this context?
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