Fix a flaky test.

16656.patch

@@ -0,0 +1,39 @@
+From 957abbb637931558a2785941981c05401c2050d7 Mon Sep 17 00:00:00 2001
+From: Elliott Sales de Andrade <quantum.analyst@gmail.com>
+Date: Wed, 4 Mar 2020 00:00:56 -0500
+Subject: [PATCH] Make test_imagegrid_cbar_mode_edge less flaky.
+
+Since parametrizing the test allows it to run in parallel, this makes it
+flaky, as one process can overwrite the test result image of another.
+
+Our standard way for dealing with tests that use the same baseline image
+is to pass duplicate filenames to `image_comparison`, because that is
+serialized.
+---
+ lib/mpl_toolkits/tests/test_axes_grid.py | 12 +++++++++---
+ 1 file changed, 9 insertions(+), 3 deletions(-)
+
+diff --git a/lib/mpl_toolkits/tests/test_axes_grid.py b/lib/mpl_toolkits/tests/test_axes_grid.py
+index 58358b68665..6c88ba9794e 100644
+--- a/lib/mpl_toolkits/tests/test_axes_grid.py
++++ b/lib/mpl_toolkits/tests/test_axes_grid.py
+@@ -12,10 +12,16 @@
+ # The original version of this test relied on mpl_toolkits's slightly different
+ # colorbar implementation; moving to matplotlib's own colorbar implementation
+ # caused the small image comparison error.
+-@pytest.mark.parametrize("legacy_colorbar", [False, True])
+-@image_comparison(['imagegrid_cbar_mode.png'],
++@image_comparison(['imagegrid_cbar_mode.png'] * 2,
+                   remove_text=True, style='mpl20', tol=0.3)
+-def test_imagegrid_cbar_mode_edge(legacy_colorbar):
++def test_imagegrid_cbar_mode_edge():
++    # Note, we don't use @pytest.mark.parametrize, because in parallel this
++    # might cause one process result to overwrite another's.
++    for legacy_colorbar in [False, True]:
++        _test_imagegrid_cbar_mode_edge(legacy_colorbar)
++
++
++def _test_imagegrid_cbar_mode_edge(legacy_colorbar):
+     mpl.rcParams["mpl_toolkits.legacy_colorbar"] = legacy_colorbar
+ 
+     X, Y = np.meshgrid(np.linspace(0, 6, 30), np.linspace(0, 6, 30))

python-matplotlib.spec

@@ -59,6 +59,10 @@ Patch0001:      0001-Force-using-system-qhull.patch
 # Don't attempt to download jQuery and jQuery UI
 Patch0002:      0001-Use-packaged-jquery-and-jquery-ui.patch
 
+# Fix a flaky test
+# https://github.com/matplotlib/matplotlib/pull/16656
+Patch0003:      https://github.com/matplotlib/matplotlib/pull/16656.patch
+
 # Fedora-specific patches; see:
 # https://github.com/fedora-python/matplotlib/tree/fedora-patches
 # https://github.com/fedora-python/matplotlib/tree/fedora-patches-non-x86
@@ -260,6 +264,8 @@ Requires:       python3-matplotlib%{?_isa} = %{version}-%{release}
 
 %patch0002 -p1
 
+%patch0003 -p1
+
 # Fedora-specific patches follow:
 %patch1001 -p1
 # Updated test images for new FreeType.