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

[Juri Linkov]

> In the meantime, I suggest we anyway provide complete such
> information on a help key.  This "solution" can remain,
> regardless of whatother designs might be adopted to provide
> some such info all of the time (instead of just on demand).

You mean displaying this information in the *Help* buffer
like ‘?’ in query-replace does?

> Wrt this bug and the prompt, for now: Either drop any
> indication of state in the prompt (which might confuse
> people) or show only what we showed before (regexp vs
> literal), ignoring indicating char folding, case folding,
> and whitespace folding.

Right, let's keep the status quo for now, and display
only regexp-function statuses in the prompt.