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: dgutov@yandex.ru,  larsi@gnus.org,  stephen.berman@gmx.net,
>   38044@debbugs.gnu.org
> Date: Wed, 27 Nov 2019 01:01:20 +0200
> 
> A new patch avoids calling region-history-mode
> if the backend doesn't implement it:

Thanks.

This seems to implement the command only for Git, though?  Or am I
missing something?

Also, we need to document this.