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

[Eli Zaretskii]

> From: Stephen Berman <stephen.berman@gmx.net>
> Cc: 23571@debbugs.gnu.org
> Date: Mon, 06 Jun 2016 21:38:02 +0200
> 
> >> 72166f2f3dba18f1217c666574032f5a0351ed65 is the first bad commit
> >> commit 72166f2f3dba18f1217c666574032f5a0351ed65
> >> Author: Martin Rudalics <rudalics@gmx.at>
> >> Date:   Tue May 3 08:38:49 2016 +0200
> >> 
> >>     Bind `widget-button-click' to mouse-1/-2 instead of down-mouse-1/-2
> >>     
> >>     * lisp/wid-edit.el (widget-keymap): Bind `widget-button-click'
> >>     to mouse-1/-2 instead of down-mouse-1/-2.  Suggested by Stefan
> >>     Monnier.  (Bug#19185, Bug#20398)
> >
> > So I guess Gnus needs to do something to countermand the low-level
> > change, right?
> 
> It turns out it's not just Gnus Article buffers (as presciently
> suggested by the title of bug#23653, which I merged with this one): in
> fact, the same problem appears to happen in all packages in which
> buffers use widget-keymap; there are quite a few of these, as rgrepping
> for widget-keymap on the lisp directory shows, and in all that I tried
> (cus-edit, wid-browse, recentf, printing, secrets, image-dired,
> todo-mode) the problem with mouse-1 occurred.  So I think the fix should
> be in widget-button-click, or somewhere at that level, and not in all of
> its users.

How do you do that without reintroducing the bug referenced in the
above commit's log message?