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

[Gregory Heytings]

> > > This reminds me of something I've wanted more than a handful of times 
> > > -- it'd be nice to have a function/macro like
> > >
> > > (when-file-has-changed "/etc/mailcap"
> > >   (do-the-parsing))
> >
> > See attached patch.
>
> And here's another attempt to fix the bug, which uses the 
> when-file-has-changed macro.

ENOPATCH catched.

Read-mailcaps-again-only-when-necessary.patch
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