Re: Debouncing slow mode line constructs (was: Emacs design and architecture. How about copy-on-write?)

[Ihor Radchenko]

Eli Zaretskii <eliz@gnu.org> writes:

>> > Though if we just do this silently, it can hide performance problems, 
>> > both discouraging the mode-line authors from fixing them, and creating 
>> > odd behaviors (from the user's POV) when something which should change, 
>> > doesn't.
>> 
>> A warning may be displayed when this "debouncing" is activated.
>
> You cannot easily display any warnings from redisplay.

Can't the code inside :eval display warnings?

In any case, it is not a big problem to arrange the warning to be
displayed after redisplay finishes.

-- 
Ihor Radchenko // yantar92,
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