unstoppable warning when running legend example from the docs

[piever]

After trying:

using Makie, GeometryTypes, Colors

# Create some plots for which we want to generate a legend
scene = Scene()
plots = map([:dot, :dash, :dashdot], [2, 3, 4]) do ls, lw
    linesegment(linspace(1, 5, 100), rand(100), rand(100), linestyle = ls, linewidth = lw)
end
push!(plots, scatter(linspace(1, 5, 100), rand(100), rand(100)))
center!(scene)

from the docs, I get a repeating warning (it repeats itself until I kill the Julia session:

WARNING: Message queue is full. Ordering may be incorrect.

I'm on Makie master (and GeometryTypes v0.4.4, Colors 0.8.2)