[BUG] Surface + PyPlot + Themes

[atgmello]

Details

surface plots using pyplot backend plus :bright, :vibrant or :mute themes causes jumbled plot colors.

import Plots
Plots.pyplot()
Plots.theme(:vibrant)
x = collect(-10:10)
y = collect(-10:10)
z = (x,y) -> (x-y)^2
Plots.surface(x,y,z)

Backends

This bug occurs on ( insert x below )

Backend	yes	no	untested
gr (default)		x
pyplot	x
plotly		x
plotlyjs		x
pgfplotsx			x
inspectdr			x

Versions

Plots.jl version: v1.1.2 [91a5bcdd]
Output of versioninfo():

julia> versioninfo()
Julia Version 1.3.0
Commit 46ce4d7933 (2019-11-26 06:09 UTC)
Platform Info:
  OS: Linux (x86_64-pc-linux-gnu)
  CPU: Intel(R) Core(TM) i7-5500U CPU @ 2.40GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-6.0.1 (ORCJIT, broadwell)
Environment:
  JULIA_NUM_THREADS = 16

[isentropic]

@atgmello I advise against using these themes (:bright, :vibrant or :mute) in general

And perhaps we have to deprecate them as they are not even themes, but just colormaps @daschw ?

I suggest using this

surface(x,y,z, c=:balance)

For more details, go to http://docs.juliaplots.org/latest/generated/colorschemes/

[atgmello]

Yeah, this is enough for what I need! Thanks for the tip @isentropic .