bug#14233: 24.3; Don't constrain frame size to character multiples

[Eli Zaretskii]

> Date: Tue, 23 Apr 2013 08:50:53 +0200
> From: martin rudalics <rudalics@gmx.at>
> CC: Eli Zaretskii <eliz@gnu.org>, esabof@gmail.com, 
>  14233@debbugs.gnu.org
> 
> When you remove the scrollbars the Emacs frame shrinks.  When you
> remove the fringes it does not shrink.  Yet, when changing frame
> sizes we are expected to handle fringes and scrollbars alike: They
> are no text, they are no windows and therefore should not be counted
> in the width of the frame's text area.

I think this peculiar handling of the fringes is because of the desire
to count the display margins, if they are present, as part of the text
area.