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

[Eli Zaretskii]

> Date: Sun, 04 Nov 2018 16:46:31 +0100
> From: martin rudalics <rudalics@gmx.at>
> CC: 33254@debbugs.gnu.org
> 
>  >> No.  It works with Emacs 23.
>  >
>  > Still, that's a very long time.  Why is it urgent to fix this in 26.2?
> 
> It's not the visible behavior that's disquieting me.  It's rather the
> fact that 'balance-windows-1' goes on calculating all sorts of things
> and finally 'balance-windows' sumbits a wrongly calculated structure
> to 'window-resize-apply' which only gets caught by window_resize_check
> at a very, very late stage.  Ideally, window_resize_check would emit a
> warning in such a case, but I never got around to write it.
> 
> I think the bug happens to users of 'balance-windows' all the time but
> they hardly notice because for that it needs at least three windows,
> one of them of fixed size.  With my example it's barely noticeable at
> all.  Also it's a plain thinko and probably not that urgent so I can
> make the change on Emacs 27 only as well.

OK, let's have it one emacs-26.