bug#38044: 27.0.50; There should be an easier way to look at a specific vc commit

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Cc: Dmitry Gutov <dgutov@yandex.ru>,  larsi@gnus.org,
>   stephen.berman@gmx.net,  38044@debbugs.gnu.org
> Date: Wed, 20 Nov 2019 00:20:08 +0200
> 
> > Stepping a notch back, wasn't the original request to have a command
> > that would display a specific commit?  If so, that's not a "log"
> > command, that's closer to a "diff" command.  And don't we already have
> > a "diff" command which shows diffs for a specific revision?
> 
> Then we could use something like the existing backend 'region-history'
> that for vc-git uses 'git log', but displays both the log and diff
> in one output buffer.

region-history is slow, so I'm not sure it is a good starting point
for this feature.  A diff command is usually very fats with every VCS.