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

[Eli Zaretskii]

> Date: Sun, 04 Nov 2018 11:18:02 +0100
> From: martin rudalics <rudalics@gmx.at>
> 
> 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?