bug#38457: 27.0.50; dabbrev-expand regression due to message change

[Eli Zaretskii]

> From: Kévin Le Gouguec <kevin.legouguec@gmail.com>
> Cc: Juri Linkov <juri@linkov.net>,  38457@debbugs.gnu.org,
>   stephen.berman@gmx.net
> Date: Thu, 05 Dec 2019 16:24:08 +0100
> 
> Mmm, as you say, the message infrastructure is used everywhere in Emacs,
> and it has received significant changes in aa89c84e00d.
> 
> I think the regression Stephen noticed is more widespread than just
> dabbrev-expand: e.g. TRAMP is also affected[1].  Does it make sense to
> address each symptom individually?

I didn't say individually, I said I would like to see a simpler
change, one that doesn't yet again change the infrastructure
significantly.

For example, to fix the dabbrev case we could bind
minibuffer-message-timeout to zero in progress-reporter-do-update.

> Were dabbrev, TRAMP, and possibly others wrong to assume that they
> could call (message …) without causing 2-second delays?

No.