On 9/27/23 15:25, Emanuel Berg wrote:
> David Hedlund wrote:
>
>> sudo apt install -y emacs wmctrl # Just press Enter during the
>> "Postfix Configuration"
>>
>> tee ~/.emacs > /dev/null << 'EOF'
>>
>> (defun switch-full-screen ()
>>         (interactive)
>>         (shell-command "wmctrl -r :ACTIVE: -b toggle,fullscreen"))
>>
>> EOF
> Yes, do that and then M-x switch-full-screen RET
>
> or just type
>
>    (shell-command "wmctrl -r :ACTIVE: -b toggle,fullscreen")
>
> and do C-x C-e for `eval-last-sexp'.
>
> It doesn't work?
>

Sorry, it works, I just expected the snippet from Emacs wiki to work 
out-of-the-box automatically. But I had to add: (add-hook 
'after-init-hook 'switch-full-screen)  . Also, "toggle" is useless for 
wmctrl in this situation, so I replaced it with "add", and I replaced 
"fullscreen" with "maximized_horz,maximized_vert"

Here's the final solution for X11 (Trisquel, Ubuntu MATE), but not for 
Wayland (Ubuntu):

(defun switch-full-screen ()
        (interactive)
        (shell-command "wmctrl -r :ACTIVE: -b add,maximized_horz,maximized_vert"))


This is a very compact and useful solution. Again, I suggest it to be documented in the Emacs Manual in a new page:https://www.gnu.org/software/emacs/manual/html_node/efaq/Fullscreen-mode-on-GNU-Linux.html

Again, the devilspie2 solution is much longer, can be used for both X11 and Wayland.