Maximizing new windows

[Tmpod]

What Operating System(s) are you running on?

Linux Wayland

Which Wayland compositor or X11 Window manager(s) are you using?

KWin

WezTerm version

wezterm 20240203-110809-5046fc22

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Hello!

Today I finally got around to giving wezterm a try and was now playing around with my config.
One thing I really like to have on my terminal emulators is for new windows to always start maximized, so that when I use Super+T (my global keybind to open a new terminal window), it fills my entire screen.

Now, I've read #284 and used both GUI events as follows:

wezterm.on("gui-startup", function(cmd)
	local _, _, window = mux.spawn_window(cmd or {})
	window:gui_window():maximize()
end)

wezterm.on("gui-attached", function(_)
	mux.get_window():gui_window():maximize()
end)

The first one works great, wezterm's first window is maximized (so are windows spawned with --always-new-process), but subsequent ones are not.
I've even chucked some prints in both, and I see that gui-startup is being called, but gui-attached isn't.

Am I missing something obvious (likely!) or is this not working as intended?