reverse-i-search doesn't show true current search string

[Dan Jacobson]

Unlike real emacs' isearch-backward, bash's reverse-i-search's echo
area doesn't reflect the true state of what bash is currently
searching.

$ echo zyxw
zyxw
$ ^Rzx
(reverse-i-search)`z': echo zyxw

We are actually searching for zx at this point. If we were searching
for just z now, we could add a y and match, but in fact we must use a
DEL first.

So it should say zx...

Bash Version: 2.05b