bug#16728: 24.3.50; bug? (with-temp-buffer (insert "foo")) deactivates mark in current buffer

[Oleh <o.krehel@tue.nl>]

I'm not sure if it's a bug, that's why I'm asking.
To reproduce, in *scratch* `mark-whole-buffer` and `eval-expression`

    (with-temp-buffer (insert "foo"))

it deactivates mark, although this doesn't:

    (with-temp-buffer (forward-char 1))

and this doesn't (assuming there are two windows with different
buffers):

    (progn (other-window 1) (insert "foo"))

although this does:

    (progn (other-window 1) (insert "foo") (other-window 1))

although this doesn't:

    (progn (other-window 1) (forward-char 1) (other-window 1))

I realize that there's the `deactivate-mark` variable, but I think
it would be better if operations on other buffers would be
consistent in not modifying the mark in current buffer.

regards,
Oleh