bug#33571: 26.1.90; Artifacts in echo area

[Eli Zaretskii <eliz@gnu.org>]

> From: Live System User <nyc4bos@aol.com>
> Date: Sat, 01 Dec 2018 22:17:07 -0500
> 
>         After a "git pull" and make of Emacs 26.1.90, I am
>         now seeing artifacts in the echo area.
> 
>         I have "C-c g" bound to "magit-status".
> 
>         After executing "C-c g" I get the results but see in the
>         echo area:
> 
>              C-c g
> 
>         This remains in the echo area until another key is pressed.
> 
>         Additionaly, this same behavior occurs in the latest Emacs 27
>         which displays:
> 
>               C-c g-
> 
>         (Note the trailing hyphen "-" in Emacs 27 only.  Let me know
>         if this should be reported to Emacs 27 bugtracker  separately).

Can you prepare a complete stand-alone recipe for reproducing the
issue, starting from "emacs -Q"?  The recipe can include loading of
magit, if needed, but please start from "emacs -Q", and please don't
include in it anything not directly related to this issue.

>         Could it be related to the recent changes to keyboard.c?

Which ones?

Thanks.