[BUG] Markers not in legend when plotting step functions

[eirikbrandsaas]

Details

X = rand(10,4)
plot(plot(X, markershape = :auto),plot(X, markershape = :auto,linetype=:steppost))

You'd expect(?) that the markers would still be there, and the same happens for steppre and stepmid.

Backends

This bug occurs on ( insert x below )

Backend	yes	no	untested
gr (default)	X
pythonplot			X
plotlyjs			X
pgfplotsx			X
unicodeplots			X
inspectdr			X
gaston			X

Versions

Plots.jl version: Plots v1.40.1
Backend version (]st -m <backend(s)>): GR v0.73.2
Output of versioninfo():

Julia Version 1.10.0
Commit 3120989f39b (2023-12-25 18:01 UTC)
Build Info:
Official https://julialang.org/ release
Platform Info:
OS: Linux (x86_64-linux-gnu)
CPU: 12 × Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
WORD_SIZE: 64
LIBM: libopenlibm
LLVM: libLLVM-15.0.7 (ORCJIT, skylake)
Threads: 5 on 12 virtual cores
Environment:
JULIA_EDITOR = code
JULIA_NUM_THREADS = 4