bug#14729: 24.3.50; Isearch oddity

[Juri Linkov]

>> Or to turn the failing search into a successful one
>> since the search string matches the buffer.
>
> But we've skipped past the final match, so I think it's correct to still
> say that we've skipped past, even if we add more characters.  Probably.

The matched string is highlighted partly in the buffer,
and exactly the same parts are highlighted in the isearch prompt too -
the string "buf" is highlighted as the matched string in the buffer,
and the same string "buf" has no failure indication in the isearch prompt.
So currently there is consistency between these highlightings: