bug#48841: [PATCH VERSION 2] Add new `completion-filter-completions` API and deferred highlighting

[Eli Zaretskii]

> From: Daniel Mendler <mail@daniel-mendler.de>
> Cc: Eli Zaretskii <eliz@gnu.org>, João Távora
>  <joaotavora@gmail.com>, Stefan Monnier <monnier@iro.umontreal.ca>,
>  Dmitry Gutov <dgutov@yandex.ru>
> Date: Fri, 13 Aug 2021 12:38:28 +0200
> 
> I attached the overhauled patch, which addresses most of the comments by
> Eli.  In comparison to my last patch, the patch is fully backward
> compatible and preserves all existing tests.  As before, there are tests
> which check the new functionality for each existing completion style.

Thanks.  You were faster than me, so I sent a few more comments to the
old patch today.