bug#40774: Error messages shouldn't be hidden when the user is idle

[Lars Ingebrigtsen]

Juri Linkov <juri@linkov.net> writes:

> +** The return value of 'clear-message-function' will change in later 
> releases.
> +When it will return a non-nil, the echo area won't be cleared.

I think I opined that we probably shouldn't introduce any semantics for
these functions here, because it might break people's code in subtle
ways.

So if we want this, we should probably introduce a new facility of some
kind (and perhaps obsolete the old one), to have an orderly transition.

-- 
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   bloggy blog: http://lars.ingebrigtsen.no