bug#43016: replace-region-contents takes a lot of time when called from json-pretty-print-buffer

[Eli Zaretskii]

> From: Tassilo Horn <tsdh@gnu.org>
> Cc: Eli Zaretskii <eliz@gnu.org>,
>       "43016@debbugs.gnu.org" <43016@debbugs.gnu.org>,
>       Paul Eggert <eggert@cs.ucla.edu>
> Date: Mon, 24 Aug 2020 19:14:50 +0200
> 
> So basically I'd say the problem is in gnulib's compareseq.  If it can't
> be fixed there, I see no other possibility than to stop using
> replace-buffer/region-contents in json.el (and wherever it might also be
> used).  That would be sad because except for the performance in some
> cases, it's very nice. :-(

Could we decide whether to use replace-* functions dynamically, based
on the size of the region/buffer being prettified?

Btw, there's another problem with compareseq, see bug#42931.  I guess
we need to add another criterion for early_abort, based on depth of
recursion?

Thanks.