bug#22991: 25.0.92: C-u C-s does not display "Regexp I-search:" in the echo area

[Drew Adams]

> (2) As for an extra binding that shows the complete list of all the active
> isearch modes, I agree with Drew that it can show a complete picture of
> what isearch is doing behind the scenes. @Drew: Can you please open it as
> a new bug report?

Done: #23010.

(Please use plain text, not HTML text, for this list. Thx.)