bug#27819: invoking `artist-mouse-choose-operation' gives "if: Wrong type argument: listp, 110"

[Eli Zaretskii]

> From: Stephen Berman <stephen.berman@gmx.net>
> Date: Fri, 28 Jul 2017 14:27:16 +0200
> Cc: tab@lysator.liu.se, 27819@debbugs.gnu.org
> 
> > A possible disadvantage of this fix is that typing `M-x
> > artist-mouse-choose-operation' will pop up the menu wherever the mouse
> > pointer is, which on a graphical display could be anywhere on the
> > screen, not necessarily within the Emacs window or even frame displaying
> > the artist-mode buffer.
> 
> I think this is less disturbing that getting the error, and since, when
> invoking the command with down-mouse-2 as intended, passing
> last-nonmenu-event has the same effect as passing t (i.e., popping up
> the menu where the mouse pointer is), I see no problem with making this
> change.  (It also DTRT if `artist-mouse-choose-operation' is rebound,
> though if that isn't how the error message showed 110, then something
> else must be going on.)  So if there are no objections, I'll push it to
> master.

Please do, and thanks.