Re: [PATCH v2] grep: avoid setting UTF mode when dangerous with PCRE

If none of the patches that are trying to fix our usage of PCRE2 are
ACKed.
It would be preferable (from my perspective) to revert only ae39ba431a
(grep/pcre2: fix an edge case concerning ascii patterns and UTF-8 data,
2021-10-15) and disable the feature (for the time being) if PCRE2 is
selected, like so:

diff --git a/pretty.c b/pretty.c
index 1af5b093ae..a53d008d1e 100644
--- a/pretty.c
+++ b/pretty.c

@@ -452,7 +452,7 @@ static void append_line_with_color(struct strbuf

*sb, struct grep_opt *opt,
 buf = line;
 eol = buf + linelen;

- if (!opt || !want_color(color) || opt->invert)
+ if (!opt || !want_color(color) || opt->invert || opt->pcre2)
  goto end;