bug#56546: 29.0.50; unbounded RAM comsumption when displaying images

[Eli Zaretskii]

> Cc: 56546@debbugs.gnu.org
> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Thu, 14 Jul 2022 18:59:20 +0200
> 
> "Jose A. Ortega Ruiz" <mail@jao.io> writes:
> 
> >   - emacs -Q
> >   - M-x eww RET https://xenodium.com/emacs-zones-to-lift-you-up/
> >   - RAM consumption grows to ~600Mb
> >   - R (redisplay page): RAM grows to ~1100Mb
> >   - R (redisplay page): RAM grows to ~1752Mb
> >   - R (redisplay page): RAM grows to ~2222Mb
> >   - rinse and repeat: RAM never goes down
> >   - (image-cache-size) reports a modest 82Mb
> >   - Kill buffer:  high RAM consumption is still at its maximum, even
> >     after (image-cache-size) goes to 0
> 
> I think this should all be fixed on the current trunk now -- can you
> check?

FWIW, on my system the pattern of the memory footprint didn't change
after this.  I still see the footprint going up after each "M-x eww",
and killing the buffer and invoking clear-image-cache causes Emacs to
go back to somewhat higher than its original size.