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

[Eli Zaretskii]

> Date: Mon, 22 Apr 2013 17:36:28 +0200
> From: martin rudalics <rudalics@gmx.at>
> CC: Eli Zaretskii <eliz@gnu.org>, esabof@gmail.com, 
>  14233@debbugs.gnu.org
> 
>  >> I suppose it's used for the vertical divider.
>  >>
>  >
>  > That is not so, the divider is just a one pixel wide line.
> 
> IIUC the vertical divider counts as a one character wide column.

Correct.  If it were a single pixel, one couldn't drag it to resize
windows.  See coordinates_in_window.