bug#33254: 26.1.50; Fixed-size windows break 'balance-windows'

[Eli Zaretskii]

> Date: Mon, 05 Nov 2018 10:33:30 +0100
> From: martin rudalics <rudalics@gmx.at>
> CC: 33254@debbugs.gnu.org
> 
> This bug was hiding another one which is already mentioned in a
> comment as
> 
>      ;; How can we be sure that `number-of-children' is NOT zero here ?
> 
> and in fact making all windows fixed-size would make 'balance-windows'
> fail with an arithmetic error.  So the fix is slightly more involved
> and I'd rather save that one for master.

I obviously agree.

Thanks.