bug#22870: 25.0.91; Mouse-clicks fail on button overlays with display properties

[Eli Zaretskii]

> From: Stefan Kangas <stefan@marxist.se>
> Date: Wed, 9 Oct 2019 18:21:22 +0200
> Cc: 22870@debbugs.gnu.org
> 
> > Looks like this happens because the first argument given to
> > `button-activate' is `("..." . 1)', while it should be the overlay.
> 
> It seems like it was broken by this commit:
> 24fc948039 2012-12-06 * lisp/button.el: Make them work in header-lines.

Can you sport which part(s) of that change broke this?

Thanks.