bug#53126: 29.0.50; [PATCH] Lazy highlight/count when reading query-replace string, etc.

[Juri Linkov <juri@linkov.net>]

> The anzu package was mentioned recently in the mailing list.  Emacs now
> includes the lazy-count feature, which is the main purpose of anzu, but
> it's still missing one nice feature from that package, namely the
> highlighting and count of matches as one types a regexp or string to
> replace in `query-replace{-regexp}'.  See the below patch for a
> (probably not yet mature) stab at this.

Strange, I expected that the lazy-count feature applied to query-replace
should do a different thing - when querying about replacing the current match,
it should show the number of current match and the number of total matches.
The latter number should be updated after every replacement.

But your patches are intended for a different feature - highlighting
of matches in the buffer while entering an input string in the minibuffer.

I wonder how many users need this feature, when it's easy to construct
a query-replace string using highlighting/counting in isearch-mode, then type M-%
(isearch-query-replace) that invokes query-replace with the query-replace string.

Perhaps better to ask on emacs-devel if anyone needs this feature.