bug#21969: VC opens new window to display minimal messages

[Eli Zaretskii]

> Cc: 21969@debbugs.gnu.org
> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Sun, 22 Nov 2015 18:46:39 +0200
> 
> On 11/22/2015 06:20 PM, Eli Zaretskii wrote:
> 
> > FWIW, I think changing it back to synchronous would be a step
> > backward.
> 
> In a sense, it is. But then, if the diff command is fast enough when 
> using all backends where I've changed it back, we should be able to live 
> with it.

When I tried in the past claim that very fast commands don't need to
be asynchronous, there was always someone who'd disagree, on the
premises that there's no "fast enough".