bug#68006: 30.0.50; Image-mode speed

[Eli Zaretskii]

> From: Manuel Giraud <manuel@ledu-giraud.fr>
> Cc: 68006@debbugs.gnu.org
> Date: Tue, 26 Dec 2023 19:07:00 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > The comparison with times-less-p is also risky: what if someone
> > replaces the image file with an older file?
> 
> I don't understand what the risk is here?  It is just a cache.

The risk is that you won't notice the fact that the image file was
replaced.

> > I'd trust some kind of file checksum better, which we will have to
> > store alongside the image spec or as part of it.  (Don't we already do
> > something like that somewhere in image-*.el files?)
> 
> For image-dired, there is 'image-dired-contents-sha1'.  Maybe this the
> one you thought about?

Probably.