GLMakie shows blank white canvas when theme background color is transparent.

[Datseris]

• 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? Windows 10, Julia 1.10.4, NVIDIA

Right, so this is very odd. Do:

using GLMakie
update_theme!(;
    backgroundcolor = :transparent,
)

then do:

julia> fig, ax = lines(rand(100), figure = (backgroundcolor = :tomato,))

but

julia> fig, ax = lines(rand(100))

Everything is a blank white canvas. Which makes 0 sense, because I am only changing the background. I believe there is some weird bug with how GLMakie understands the background color, because if it is transparent, then it shows nothing.

[ffreyer]

Maybe fixed by #4150