bug#25482: 26.0.50; Allow setting `query-replace-from-to-separator` to nil

[Eli Zaretskii]

> From: Thierry Volpiatto <thierry.volpiatto@gmail.com>
> Cc: 25482@debbugs.gnu.org
> Date: Sat, 28 Jan 2017 11:43:48 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Thanks, but I don't understand why you want to get rid of the display
> > property.
> 
> This complicate the code and force external apps to handle this, see
> https://github.com/emacs-helm/helm/commit/2b8576c0705145b5d133e41478976eef5b3d7390

Maybe I'm missing something, but the above is no different from the
need to adapt to any new feature in core Emacs.

> Selecting foo → bar in a list results in foo^@bar being entered into the
> minibuffer, not with the query-replace interface but when handling the
> history list from somewhere else.

Yes, the external packages need to adapt to this, if they want to use
the internal features.  I don't think this can be avoided in general.