bug#8161: 24.0.50; query-replace-regexp fails with interactive replacement text

[Chong Yidong]

Juri Linkov <juri@jurta.org> writes:

> This feature (\?) is specific to `query-replace-regexp', so mentioning
> it in low-level `replace-match' would be wrong.  It should be dealt at
> the same level where it's used in replace.el the same way as \? is
> processed in `replace-match-maybe-edit'.

I didn't see a clean way to do this, so I committed Lawrence's patch.
This bug ought to have been fixed for 24.1, but it got lost in the pile;
sorry.