RE: new help message in Emacs 25

[Drew Adams]

> > Yes, option
> > `extended-command-suggest-shorter'
> > controls this.
> > ...
> > Emacs didn't used to provide the `M-x
> > some-abbreviation' information. That was
> > added a release or two ago. The behavior was
> > what you get if you customize option
> > `extended-command-suggest-shorter' to nil.
> 
> ... ?
> 
> I don't have `extended-command-suggest-shorter'
> (at all), if by "option" you mean "a variable
> the user is supposed to fiddle with"?

Yes, it looks like it was introduced in Emacs 26,
but the new echoing of an `M-x <some-abbreviation>'
reminder was introduced in Emacs 25.  Perhaps
someone reported an enhancement request because
she, like you, didn't care for the new behavior.

> I have `suggest-key-bindings' tho as `t', which
> makes sense.