3D plots not clipped at axis limits

[tomasaschan]

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Simple reproduce script:

using PyPlot

# Create a figure with a 3D plot
subplot(111,projection="3d")

# Plot a curve
t = 0:.1:6pi
plot(cos(t),sin(t),t) # nice helix around z axis

# Restrict domain
xlim(0,1)
ylim(0,1)

# Domain for "backdrop is now restricted, but entire helix still drawn!

I don't know if this is a problem in PyPlot.jl or a more fundamental one in matplotlib - for some reason I can't get matplotlib working with 3d projections at all when running from plain python. If someone else can get that working, and verify that it's an issue with matplotlib rather than PyPlot, I'll file the issue there instead.

FWIW, I have PyPlot 1.2.9, matplotlib 1.3.1, running

julia> versioninfo()
Julia Version 0.3.0-rc1+27
Commit 9e5ffd6 (2014-07-15 08:13 UTC)
Platform Info:
  System: Linux (x86_64-linux-gnu)
  CPU: Intel(R) Xeon(R) CPU           E5410  @ 2.33GHz
  WORD_SIZE: 64
  BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY Penryn)
  LAPACK: libopenblas
  LIBM: libopenlibm