contour does not plot over the whole domain

[francispoulin]

Details

I am trying to plot an array using contour and it does not seem to plot all the contours, but contourf does.

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: v1.20.1
Backend version (]st -m <backend(s)>):
Output of versioninfo():
Julia Version 1.6.0
Commit f9720dc2eb (2021-03-24 12:55 UTC)
Platform Info:
OS: Linux (x86_64-pc-linux-gnu)
CPU: Intel(R) Xeon(R) W-2295 CPU @ 3.00GHz
WORD_SIZE: 64
LIBM: libopenlibm
LLVM: libLLVM-11.0.1 (ORCJIT, cascadelake)

I have defined the following array:

A = [0.0  0.015625   0.0625     0.140625   0.25      0.390625  0.5625    0.765625  1.0
                     0.0  0.0156245  0.0624991  0.140624   0.249999  0.390624  0.562499  0.765624  1.0
                     0.0  0.0156115  0.0624769  0.140596   0.249969  0.390596  0.562477  0.765612  1.0
                     0.0  0.0154144  0.0621382  0.140172   0.249517  0.390172  0.562138  0.765414  1.0
                     0.0  0.0136686  0.0590821  0.136326   0.2454    0.386305  0.559039  0.763605  1.0
                     0.0  0.0        0.0433791  0.115757   0.222958  0.364983  0.541832  0.753504  1.0
                     0.0  0.0        0.0        0.0548146  0.150001  0.292113  0.48115   0.717113  1.0
                     0.0  0.0        0.0        0.0        0.0       0.14888   0.348769  0.632475  1.0
                     0.0  0.0        0.0        0.0        0.0       0.0625    0.25      0.5625    1.0
                     0.0  0.0        0.0        0.0        0.0       0.14888   0.348769  0.632475  1.0
                     0.0  0.0        0.0        0.0548146  0.150001  0.292113  0.48115   0.717113  1.0
                     0.0  0.0        0.0433791  0.115757   0.222958  0.364983  0.541832  0.753504  1.0
                     0.0  0.0136686  0.0590821  0.136326   0.2454    0.386305  0.559039  0.763605  1.0
                     0.0  0.0154144  0.0621382  0.140172   0.249517  0.390172  0.562138  0.765414  1.0
                     0.0  0.0156115  0.0624769  0.140596   0.249969  0.390596  0.562477  0.765612  1.0
                     0.0  0.0156245  0.0624991  0.140624   0.249999  0.390624  0.562499  0.765624  1.0]

When I try plotting plt = contour(A') I get the following plot entitled contour.png. It seems to be missing stuff at the top, which is included in the contourf version. Is this a bug?

[francispoulin]

I want to add that I get the same plot when I use pyplot and not just gr.

Anyone else can confirm they get this odd behavour?

[t-bltg]

Closing in favor of jheinen/GR.jl#503 (this is a low-level backend issue).