Works if pasted to REPL, not if included from file

animtest.jl

using Makie

function heart()
	scene = scatter([0], [0], marker = '❤', markersize = 0.5, color = :red, raw = true)
end

function heart_update(scene)
	s = scene[end] # last plot in scene
	i = 0
	println(isopen(scene))
	@async while isopen(scene)
		i += 1
	    s[:markersize] = (cos(i) + 1) / 4 + 0.2
	    sleep(0.1)
	end
end

scene = heart()
heart_update(scene)