transparency affects color key

[IgorDouven]

If I add transparency to a plot, it also affects the color key. I cannot find a way to override it. Here is a MWE:

v = randn(1000)
plot(x=v, Stat.density, Geom.polygon(fill=true, preserve_order=true),
    xintercept=[-1, 1],
    Geom.vline(color="MidnightBlue"),
    Guide.manual_color_key("", ["Some interval"], ["rgba(25, 25, 112, 1.)"]),
    Theme(default_color="lightskyblue", line_width=2pt, alphas=[.3]))

The transparency is meant to pertain to the fill. It doesn't pertain to the vlines, but then also shouldn't pertain to the color key, which pertains to the vlines (in actuality I'm showing several intervals).

Also, is there a way to show the vlines 'on top of' the fill? Without the transparency, they would be partly hidden.

[Mattriks]

Layer order matters, and alphas in Theme affects the colorkey, but alpha in layers does not:

plot(x=v,
    layer(xintercept=[-1, 1], Geom.vline(color="MidnightBlue")),
    layer(Stat.density, Geom.polygon(fill=true, preserve_order=true), alpha=[.3]),
    Guide.manual_color_key("", ["Some interval"], ["rgba(25, 25, 112, 1.)"]),
    Theme(default_color="lightskyblue", line_width=2pt)
)

The bit about layer order is in the Gadfly docs (at the bottom of page).

[IgorDouven]

Thank you, and sorry for overlooking this in the documentation.