On Wednesday, September 14, 2011, Richard Stallman <rms@gnu.org> wrote:
> It is not an issue of how many "ways to exit isearch" there are.  It
> is an issue of how many commands you need to remember WON'T exit the
> search.  The idea of isearch is that control characters exit, except
> for a short list of a few.  But that list has been growing.

But does it make sense to think of C-u as a command in itself?  It's
*always* used in conjunction with another command, which may exit isearch or
not.

-- 

-PJ