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

[Stefan Monnier]

> My suggestion would free implementors of pp-to-string etc. from doing
> that in every place where they use temporary buffers, which is a very
> frequent paradigm in Emacs.

But it'll break code like

   (let ((buf (current-buffer)))
     (with-temp-buffer
       ...
       (with-current-buffer buf
         (insert "toto"))
       ...))


-- Stefan