bug#17272: bug#19064: bug#17272: bug#19064: 25.0.50; `message' overwrites `y-or-n-p' prompt, so user misses it

[Juri Linkov]

>> The first case is when doing completion, the message
>> "Making completion list..." is displayed in the minibuffer
>> for 2 seconds. I don't understand why this message is needed at all,
>> but at least this patch restores its previous behavior
>> that displays that message in the echo area and doesn't wait.
>
> Perhaps some completion functions can take a lot of time, so we message
> preemptively?  We do a lot of the "just in case" messaging in Emacs,
> unfortunately.
>
> (There's a wishlist bug report in the bug tracker to add something like
>
>   (with-delayed-message (0.5 "This sure is taking long...")
>     (here-is-some-code))
>
> that would only do the message if the body of the form takes longer than
> the timeout.)

I see, it's in bug#22922 and bug#19776.