bug#67393: 29.1; Slow to open file if autosave exists

[Juri Linkov <juri@linkov.net>]

>> > A defcustom would be one option.  'set-important-message' like
>> > implemented by Ihor would be another option.  All this could be
>> > added after creating the new function 'important-message'.
>> 
>> So here is the new function 'important-message' and its calls
>> in two discussed places.
>
> Is this in preparation for some followup?  Because if not, I'm not
> sure it is justified to add a short function that has just 2 callers.
> What do we gain, as a counter-weight to the need to document the new
> function, insist that new code uses it, etc.?

Indeed, these 2 test cases are for preparation to using it everywhere.

>> I'm not sure why 'after-find-file' uses non-nil NODISP arg
>> in (sit-for 1 t).  This means is that the message is not
>> displayed?  Then why 'message' is called?
>
> I think it means redisplay is not called.  'message' causes redisplay
> of the echo-area, but we don't need to redisplay the rest.

Would it be safe to drop NODISP in the new function?
I see that most calls of 'message' with 'sit-for'
don't use the NODISP arg.