bug#23571: 25.1.50; Click-mouse-1 = Drag-mouse-1 in Gnus Article buffer

[martin rudalics]

> AFAIK the commit is not present on emacs-25, but I would prefer to have
> it reverted on master, since its effect is a frequent annoyance for me
> and, as I noted, even without it I could not reproduce the bugs I
> understand it was intended to fix; but if I'm mistaken about that, we
> should find out soon enough and hopefully could then zero in on the
> problem.

I've reverted that commit now.

martin