bug#18022: 24.3; Emacs hard locks when attempting to do a replacement with ^M in it.

[Eli Zaretskii]

> Date: Mon, 14 Jul 2014 23:13:23 -0400
> From: Marty Rosenberg <marty.rosenberg@gmail.com>
> 
> This does in fact reproduce with emacs -Q.
> 1) type Simulator::foobar()
> 2) run M-%
>    query string is "Simulator::" RET
>    replace string is "template <bool b>" C-q RET "SimulatorBase<b>::"
> 3) hit 'y' to accept the first change (I feel like something is wrong at
>    this point)
> 3a) emacs enters a soft-locked state, I hit C-b 4 times while it was locked
> 4) hit C-g several times, to get the replacement to be shown in the
> buffer
> 5) emacs is now totally locked

I cannot reproduce this here, FWIW.