RE: Exposing Isearch toggleable options

[Drew Adams]

> I do, strongly(!), agree with Arthur that it’s really hard to know about
> all the isearch options.

No.  It's simple - provided `C-h' brings up help on Isearch,
including a list of the key bindings.

A user just needs to expect that `C-h' after a key such as `C-s'
might show key bindings, just as it does for prefix keys.  S?he
will then be pleasantly surprised to see that in the case of
Isearch `C-h' shows not only the keys but also a description
of Isearch, with descriptions of the important features,
including the important keys.

`C-h' should be the starting place, in general.  For the
help commands, of course, but also for prefix keys and modes
that use the minibuffer or, modes like Isearch, that seem to
use the  minibuffer.