bug#63815: 29.0.91; Bind `M-n' in `Info-mode-map' to `clone-buffer'

[Drew Adams]

> >> > I see.  Why not (also) `M-n', like elsewhere?
> >> > Why not treat *Help* like *info* and *Man __*?
> >>
> >> Actually, 'C-x x n' is the global keybinding.  Here is what Help says:
> >>
> >>   C-x x n runs the command clone-buffer (found in global-map).
> >>
> >>   It is bound to M-n and C-x x n.
> >
> > Is that `M-n' binding new for Emacs 30?  I don't see it in the 29
> > pretest (emacs -Q).  Anyway, if an M-n binding has already been added
> > then (great) please close this bug.  Thx.
> 
> Sorry that the answer was unclear.  This Help buffer showed help
> about the Info buffer.  So M-n exists only in Info mode.
> But in Emacs 29 a new global binding 'C-x x n' was added
> to make 'clone-buffer' available in all modes.
> This makes 'M-n' in Info obsolete.

Why would you say that (last sentence)?

That we have a global binding for the command
doesn't mean we shouldn't also have an easier,
(and long-standing) local binding for it.

The request of this bug is to add `M-n' for
`clone-buffer' to buffers in Help mode, in
addition to having it for buffers in Info mode.