bug#30955: 27.0.50; Mouse clicks on header-line in Info are broken

[Eli Zaretskii]

> Date: Sat, 31 Mar 2018 22:03:46 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 30955@debbugs.gnu.org, monnier@IRO.UMontreal.CA
> 
> But just to be sure: can you describe the exact sequence of steps you
> are taking, starting from "emacs -Q"?  In particular, are you clicking
> on the Next/Prev/Up links of the header-line in an Info buffer?

Btw, the keymap property we put on the header-line does bind mouse-2
to a command that follows link, not mouse-1:

    (define-key keymap [header-line down-mouse-1] 'mouse-drag-header-line)
    (define-key keymap [header-line mouse-1] 'mouse-select-window)
    (define-key keymap [header-line mouse-2] 'Info-mouse-follow-link)
    (define-key keymap [mouse-2] 'Info-mouse-follow-link)
    (define-key keymap [follow-link] 'mouse-face)

So I guess this is somehow related to the processing of
mouse-1-click-follows-link.