Density doesn't support alpha

[ericphanson]

Feature description

AoG example:

draw(data((;x = rand(100), y = rand(1:2, 100))) * mapping(:x; color=:y => nonnumeric) * visual(Density; alpha=0.5))

This gives

Invalid attribute alpha for plot type MakieCore.Plot{Makie.density, Tuple{Vector{Float64}}}.



The available plot attributes for MakieCore.Plot{Makie.density, Tuple{Vector{Float64}}} are:



bandwidth  colormap    cycle        linestyle  strokearound  weights  

boundary   colorrange  direction    npoints    strokecolor            

color      colorscale  inspectable  offset     strokewidth            





Generic attributes are:



clip_planes  dim_conversions  model      transformation  yautolimits        

cycle        label            rasterize  xautolimits     zautolimits        

AoG does have density() but then I hit MakieOrg/AlgebraOfGraphics.jl#518