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

[Juri Linkov]

>> For that case, Emacs should have a command that prompts for an ID
>> (defaulting to the ID under point), and then (unless default-directory
>> is already in a vc-controlled directory), prompts for the directory to
>> look for that ID, and then display the commit.
>
> I wrote such a command (appended below) for my own use, but it's
> git-specific and I don't know the innards of VC well enough to adapt it,
> which is why I haven't proposed it for inclusion in Emacs.  Maybe some
> of it could be used for a VC command.

It should be easy to add a command properly integrated into the innards of VC
by just grepping for "log-search" in lisp/vc/vc*.el (there are only 7 matches),
and after copying to replace "log-search" with "log-show", and the new command
is ready.