bug#47215: 28.0.50; Let M-x switch between M-x and M-X

[Lars Ingebrigtsen <larsi@gnus.org>]

Felician Nemeth <felician.nemeth@gmail.com> writes:

> I've discovered that the initial-input argument of `completing-read` can
> be written as (STRING . POSITION).  The attached patch makes use of it
> and shows a simple implementation of my original wish.

Nice; your patch works very smoothly -- using `M-x' to switch here feels
very natural.

> However, the patch creates code duplication.

I think that can be fixed by refactoring out most of the interactive
spec of `execute-extended-command-for-buffer' and then reusing it.

> Also, I don't know how it copes with recursive editing: maybe it's not
> a good idea to rebind M-x when `enable-recursive-minibuffers' is t.

A lot of people have `enable-recursive-minibuffers' bound, though, which
is an argument against using `M-x' as the keystroke to switch between
modes.

> Finally, the docstring says initial-input is deprecated.

I think this use case demonstrates that perhaps we should slightly
un-deprecate initial-input -- instead of deprecating it, we could
instead just discourage the usage.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no