Legend patch stroke has the wrong z value or drawing order

[rafaqz]

• what version of Makie are you running? (]st -m Makie) 0.21.6
• can you reproduce the bug with a fresh environment ? (]activate --temp; add Makie)
• What platform + GPU are you on? Linux / Nvidia

Using CairoMakie (and maybe others) Legend patchstroke seems to have a tiny bug. In this image the line is underneath the fill color rather than above it. This means the width is only half what you specify, and if your fill is a bit transparent you can see it like this.

[asinghvi17]

I can't reproduce with bare poly:

poly(Rect2f(0,0,1,1); strokewidth=10, strokecolor=:black, color=(:blue, 0.5))

but it looks like Legend does create a Box around patches:

Makie.jl/src/makielayout/blocks/legend.jl

Lines 221 to 222 in a1c513b

	rect = Box(scene; color=e.patchcolor, strokecolor=e.patchstrokecolor, strokewidth=e.patchstrokewidth,
	width=lift(x -> x[1], blockscene, e.patchsize), height=lift(x -> x[2], blockscene, e.patchsize))

so maybe the Box code needs some changes. Or we could translate the Box up by some amount so it's always on top of the marker.