bug#17302: 24.3.90; Selecting completion candidate with a mouse displays warning about obsolete command

[Eli Zaretskii]

> Date: Sun, 20 Apr 2014 18:55:23 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> 
> Steps to reproduce:
> 
>  emacs -Q
>  C-x C-f
>  TAB TAB
> 
> Now click mouse-1 or mouse-2 on a directory in the list of completion
> candidates -- you get a warning message:
> 
>   `mouse-choose-completion' is an obsolete command (as of 23.2); use 
> `choose-completion' instead.
> 
> But if you choose a file, not a directory, you get no warning, although
> the same command is invoked.
> 
> The same warning is displayed if you type "C-x d" instead of "C-x C-f"
> to begin the recipe.

I see that this is at least partially duplicate with 14162, so I will
merge them.