Prevent applications from enabling fullscreen

[walseb]

Hello!

I have a few X-applications that forces fullscreen all the time.

I'd like to prevent any application from enabling fullscreen, and just do it myself instead.

Is there any way to do this?

Thanks!

[sarg]

It's handled over here:

exwm/exwm.el

Lines 597 to 610 in 9d035d7

	(when (or (memq xcb:Atom:_NET_WM_STATE_FULLSCREEN props)
	(memq xcb:Atom:_NET_WM_STATE_ABOVE props))
	(cond ((= action xcb:ewmh:_NET_WM_STATE_ADD)
	(unless (exwm-layout--fullscreen-p)
	(exwm-layout-set-fullscreen id))
	(push xcb:Atom:_NET_WM_STATE_FULLSCREEN props-new))
	((= action xcb:ewmh:_NET_WM_STATE_REMOVE)
	(when (exwm-layout--fullscreen-p)
	(exwm-layout-unset-fullscreen id)))
	((= action xcb:ewmh:_NET_WM_STATE_TOGGLE)
	(if (exwm-layout--fullscreen-p)
	(exwm-layout-unset-fullscreen id)
	(exwm-layout-set-fullscreen id)
	(push xcb:Atom:_NET_WM_STATE_FULLSCREEN props-new)))))

You can try to add a before-while advice to exwm-layout-set-fullscreen which would define which apps can enable fullscreen.

[walseb]

Thank you so much! I will try that.

[walseb]

As a side note, it would be great if someone could rewrite this monolithic cond switch event handler as a hook that gets called with the event type. Then it would be much easier to make changes like this, and even add functionality when EXWM receives events.