bug#51118: 28.0.50; arrow keys break agda-input quail package since bd5c7404

[Eli Zaretskii]

> Date: Tue, 12 Oct 2021 12:54:34 +0000
> From: Gregory Heytings <gregory@heytings.org>
> cc: Mauricio Collares <mauricio@collares.org>, 51118@debbugs.gnu.org
> 
> > Gregory, could you please look into this?  It needs to be fixed for 
> > Emacs 28.
> >
> 
> Yes.  The problem was that quail-start-translation sometimes changes 
> last-command-event and transforms a vector into the symbol of its only 
> element.  Patch attached.

Thanks, installed on the emacs-28 branch.

Mauricio, could you please test to make sure all of your real-life
cases are solved?