bug#29478: 26.0.90; `C-h k' followed by mouse clicks no longer shows down event

[Alan Mackenzie]

Hello, Eli.

On Sat, Dec 09, 2017 at 18:13:40 +0200, Eli Zaretskii wrote:
> I think I found one more problem with Help functions on mouse clicks.
> Try this in "emacs -Q":

>   C-h c S-mouse-1
>   C-h k S-mouse-1

> In Emacs 25.2 these produce the description of mouse-appearance-menu,
> as expected, saying it's the binding of S-down-mouse-1.  Emacs
> 26.0.90 does the same for "C-h c", but claims S-mouse-1 is undefined
> if you invoke "C-h k".  The current emacs-26 branch claims S-mouse-1
> is undefined for both "C-h c" and "C-h k".

> I think this means that we have similar problems with any explicit
> bindings to S-down-mouse-N clicks.

> This is a regression that I think we must fix before releasing Emacs
> 26.1.

Yes.  I'm sorry I've had next to no time for Emacs this last week.  That
should change on Monday.  Then I'll have a look at this bug.

-- 
Alan Mackenzie (Nuremberg, Germany).