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

[Stefan Monnier <monnier@IRO.UMontreal.CA>]

>> >   For documentation of the corresponding mouse-down event,
>> >   click and hold the mouse button longer than %s sec.
>> > (where %s gets replaced by double-click-time)?
>> That's a hack/workaround

Agreed.

> The previous way, where down-event was described before the up-event,
> was also a hack.

Maybe its implementation was hackish, but as far as the UI goes I don't
think it was a hack.

> The fundamental problem here is that Emacs doesn't
> know what the user wants/needs, and the semi-kludgey way we intuit
> that when processing mouse gestures is part of the reason.

The way to solve this is to add a menu/index at the beginning indicating
that there were *several* events, such that the user is made aware that
he may have to skip some info to find the one of interest (and
presumably this menu is made clickable so the user can easily jump to
the part he wants).

The same kind of situation shows up with `C-h o` for symbols that
combine various roles (function, variable, type, face, ...), BTW.


        Stefan