bug#29321: Isearch hit count

[Drew Adams]

1. FWIW, I still see, with Emacs -Q (Emacs 26.1), after
loading `isearch.count.5.el', the same behavior of
no prompt when repeating quickly (holding down the
key) and reversing direction (and holding down the
key).  Stopping and waiting does not change this -
the prompt never appears.

This is with `isearch.count.5.el' as the buffer
being searched, with regexp search with search
pattern se\(.*\)r.

Do you confirm that you see this also?

2. Instead of a user needing to redefine function
`isearch-lazy-count-format' wouldn't it be better
to provide a variable (perhaps even an option) to
control the prefix-vs-suffix behavior?