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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Using images in tabs
Date: Tue, 17 Sep 2019 09:16:50 +0300
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> From: Clément Pit-Claudel <cpitclaudel@gmail.com>
> Date: Mon, 16 Sep 2019 18:49:22 -0400
> 
> Would using SVG be an option? I use SVG (with a fallback) in my packages when I support the tool-bar, and it works nicely wrt scaling.

I think we should support any image format that Emacs can support,
including SVG.  Emacs can be built with SVG support, but without PNG
or other formats, and it still should be functional.  And I think if
SVG is supported, we should indeed prefer it.