bug#33275: 27.0.50; Image cache pruning

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: 33275@debbugs.gnu.org
> Date: Mon, 05 Nov 2018 17:18:47 +0100
> 
> If you visit a, say, 16GB file, then, indeed, it's expected that Emacs
> grows to 16GB (or more).  But if you're just calling `image-size' on a
> bunch of files (each of which is a lot smaller than that), it's rather
> unexpected that that's going to blow up Emacs.

What was the sum of sizes of all the files you used to reproduce the
problem?