bug#16752: 24.3.50; pp-to-string deactivates mark

[Eli Zaretskii]

> From: Helmut Eller <eller.helmut@gmail.com>
> Date: Fri, 14 Feb 2014 19:27:30 +0100
> 
> On Fri, Feb 14 2014, Eli Zaretskii wrote:
> 
> >> From: Stefan Monnier <monnier@iro.umontreal.ca>
> >> Date: Fri, 14 Feb 2014 12:42:25 -0500
> >> Cc: 16752@debbugs.gnu.org
> >> 
> >> 1- let-bind deactivate-mark in functions like pp-to-string so as to
> >>    eliminate those spurious deactivations.  But there can be many of
> >>    them, and it doesn't solve the problem where the buffer-modification
> >>    is done in a non-temporary buffer.
> >> 2- make deactivate-mark buffer-local.  This is "The Right Way" but
> >>    might introduce new problems.
> >>    E.g. we really should deactivate the mark in all the buffers that
> >>    have their deactivate-mark set.
> >
> > 3- Save and restore deactivate-mark inside with-temp-buffer, which
> >    will probably solve 99.99% of these unexpected side effects.
> 
> 4- Introduce something like buffer-disable-undo that disables this
> automatic deactivate-mark updating.

I thought about such a possibility as well, but it sounds less
attractive, because it places the burden on users and Lisp programs.