bug#39735: 27.0.60; bugs about XBM images

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: ynyaaa@gmail.com,  39735@debbugs.gnu.org
> Date: Sun, 02 Aug 2020 16:36:03 +0200
> 
> Since XBM is so obscure, we could just document that XBM just doesn't
> support scaling, and that it's an error to give those parameters (unless
> you really mean XBM dimensions).

That'd be fine with me, yes.

> But again, that also means that somebody that writes a loop of
> `create-images' must be careful to not call it on XBM images...

Yes, but given its obscurity, maybe this is not so bad?