bug#14825: 24.3.50; split-window-below miscounts window lines

[Eli Zaretskii]

> Date: Wed, 10 Jul 2013 09:20:17 +0200
> From: martin rudalics <rudalics@gmx.at>
> CC: 14825@debbugs.gnu.org
> 
>  >> Currently, all window and frame sizing functions are based on canonical
>  >> character sizes.  This will change when we do resizing pixelwise.
>  >
>  > Resizing is only part of the problem.  There are functions that are
>  > unrelated to resizing, which report dimensions in canonical units.
>  > They should at least document this fact in the doc string, if not fix
>  > it.  (The fix is not too hard, btw; see window-screen-lines for an
>  > example.)
> 
> How would you report the size of an internal window composed of two leaf
> windows showing buffers with different default character sizes?

As a sum of the line counts of the two children, obviously.