bug#16882: 24.3.50; with-temp-buffer-window broken

[martin rudalics]

> Just a note on this: (Sorry to insist)
>
> You expect here the code of 'body' returns a stream like prin* function
> family does, but IMHO 'body' should be any code that is self
> contained in the "temp-buffer-window" and not elsewhere.
> IOW the actual version is not safe in this sens because it may affect
> the current-buffer.
> I suspect already existing code is affected by this new behavior.
>
> Try:
>
> (with-temp-buffer-window "foo" nil nil (princ "hello"))
>
> and now
>
> (with-temp-buffer-window "foo" nil nil (insert "hello"))
>
> I expect here "hello" to be inserted in "foo" buffer, but actually it
> corrupt current-buffer.

As the bug found by Juanma shows I was fooled by this myself.  It should
now behave again in your sense.  I still have to explain the behavior in
the manual.

Thanks, martin