bug#74496: 30.0.91; fullscreen frame set with F11 is shifted when ctwm restarts

[martin rudalics]

> This is how emacsclient looks inside a borderless fullscreen xterm.
>
>      http://sdf.org/~van.ly/img/emacs-30-0-91-inside-fullscreen-xterm.webp
>
> The minibuffer area looks stretched more than one line.

Is the violet background set up by Emacs?  There are a few violet pixels
at the right of the mode line so I suppose it is not.  How does it look
like with

(set-face-attribute 'default nil :background "red")

martin