bug#50256: thing-at-mouse

[Juri Linkov]

> In bug#50067 you suggested to add a new arg with the click event
> to all context menu functions.  This will make code more readable:
>
>   (defun context-menu-dictionary (menu click)
>     (when (thing-at-mouse click 'word)
>
> so I will change the call to provide the arg from last-input-event,
> and maybe later it will be possible to acquire the same event
> more directly, not from last-input-event, and all callers will get it.

So now a new arg 'click' was added to all context-menu-functions.