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

[Eli Zaretskii]

> Date: Sun, 04 Nov 2018 14:32:23 +0100
> From: martin rudalics <rudalics@gmx.at>
> CC: 33254@debbugs.gnu.org
> 
>  >> With emacs -Q type C-x 2 C-x 2 C-x b RET
>  >>
>  >> This should put you in the *Messages* buffer.  Now do
>  >>
>  >> M-: (setq window-size-fixed t)
>  >>
>  >> followed by
>  >>
>  >> M-: (balance-windows)
>  >>
>  >> Window sizes remain unchanged.  The attached patch should fix that.  I
>  >> would like to apply it to the release branch.  Objections?
>  >
>  > Rationale?  Isn't this behavior in Emacs since about forever?
> 
> No.  It works with Emacs 23.

Still, that's a very long time.  Why is it urgent to fix this in 26.2?