bug#12492: Acknowledgement (24.2.50; Open vc-dir buffer easier and faster)

[Juri Linkov]

> Also it makes more sense to introduce a root prefix map for the whole set of
> project related commands (not necessarily restricted to VCS):
>
> C-x / d - project dir
> C-x / f - project find file
> C-x / r - project find regexp
> C-x / t - project tag search
> C-x / s - project search/grep
> C-x / % - project query-replace
> C-x / l - project log
> C-x / = - project diff
> ...

OTOH, wouldn't it be nicer to use more mnemonic prefix key
'C-x p' where 'p' means "project".  Then:

C-x p d - project dir
C-x p s - project shell
C-x p g - project grep
...