bug#51523: 29.0.50; gnus-mime-view-part-externally very slow

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: gregory@heytings.org,  51523@debbugs.gnu.org,  monnier@iro.umontreal.ca
> Date: Mon, 01 Nov 2021 18:34:35 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > It's okay to have special-purpose functions when that's convenient,
> > but then we shouldn't put this in files.el and shouldn't advertise it
> > as a general-purpose function.
> 
> Like I said, it's something I've felt like implementing a dozen times
> but never got around to.  And the use cases are explained in the
> documentation, and I'm sure you can find plenty of cases in the Emacs
> code base where something is caching something, but reloading if the
> file has changed.

The changes I suggested will serve this use case as well as what we
have now.  The advantage of what I proposed is that it will also serve
other use cases.  So I don't understand why you are opposed to the
changes I proposed.