bug#32990: 26.1.50; isearch-forward + t-m-m/mark-active doc

[Drew Adams]

> What do you think about adding also some menu to the mode-line
> indicator of Isearch.

Sure, please do.  Isearch has a lot it could add to
such a menu, including lots of toggles.

> Currently clicking on the word "Isearch "
> in the mode-line signals the error:
> 
> Debugger entered--Lisp error: (error #("Cannot find minor mode for ‘
> Isearch’" ...

I don't see that in Emacs 26 (or before) on MS Windows.
With emacs -Q, clicking there just exits Isearch.

(With Isearch+ clicking there brings up menu `Isearch',
with items `Turn off minor mode' and `Help for minor
mode'.  But that might be due to other things in my
setup, not Isearch+.