Scatter with 3 length-1 vectors plots in 2D not 3D

[dlfivefifty]

• are you running newest version (version from docs) ?
• can you reproduce the bug with a fresh environment ? (]activate --temp; add Makie)
• What platform + GPU are you on? Mac, Radeon Pro

In both CairoMakie and GLMakie the following produces a 2D plot instead of a 3D one:

julia> scatter([1.], [2.], [3.])

If I call with length-2 vectors it works fine (eg scatter([1.,2], [2.,3], [3.,4])).

[asinghvi17]

This is probably because the z component of the bounding box is flat. We need better ways of determining 3D-ness...