bug#33275: 27.0.50; Image cache pruning

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> We still could use the memory limit calculated by get_lim_data in
> strategic places, like cache_image, to catch situations where the
> cache size exceeds some fraction of what ret_lim_data returns.  Would
> that work?

If I understand you correctly, you seem to favour introducing code that
will break code that's working today (if you insert an image into a
buffer today in a memory-pressure situation, that won't signal an error
today) instead of tweaking a non-documented ad-hoc caching strategy (by
taking the image cache size into consideration), or fixing the caching
(by using weak hash tables), and I'm not quite sure why.

`image-size' didn't use to cache images, but was introduced as an
optimisation.

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