bug#24963: 26.0.50; toggle-frame-maximized broken by double-buffering patch

[martin rudalics]

> 0. emacs -Q
> 1. M-x toggle-frame-maximized
>     => frame is maximized
> 2. M-x toggle-frame-maximized
>     => frame remains maximized, echo area displays "You can run the
>     command ‘toggle-frame-maximized’ with <M-f10>"
> 3. M-x toggle-frame-maximized
>     => now frame is restored to its prior size

Fixed by commit ae8835619655a0e28c4d84bbd8c46cc29aac6ad3.  Bug closed.

Thanks, martin