bug#63470: [PATCH] Use faster option for running vc-hg status

[Eli Zaretskii]

> Date: Fri, 12 May 2023 23:10:05 +0300
> Cc: 63470@debbugs.gnu.org
> From: Dmitry Gutov <dmitry@gutov.dev>
> 
> On 12/05/2023 22:57, Spencer Baugh wrote:
> > 
> > I could add a user option to revert to the old behavior, if you want.
> 
> We could cache it like we do with vc-git--program-version. That's a 
> simple memoization that doesn't take the host into account (though that 
> could be implemented, too).

Yes, that'd be a good-enough solution.

> But it'd really make things easier if we're just allowed to rely on some 
> new enough versions of Git and Hg.

It isn't easy to be backward-compatible, but we should strive at doing
that.