From 415cd6a314385ff8e1407bf9301312268168bfb2 Mon Sep 17 00:00:00 2001
From: Sergey B Kirpichev <skirpichev@gmail.com>
Date: Sun, 17 Dec 2017 14:07:03 +0300
Subject: [PATCH 1/3] Fix using .get_color() and friends in labels handling

This code was introduced in v2.1.1 and, apparently, wasn't tested, because .get_color() returns array.

Here is an issue example:
https://github.com/sympy/sympy/issues/13730#issuecomment-351027060
---
 lib/matplotlib/legend.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/matplotlib/legend.py b/lib/matplotlib/legend.py
index 8c2aaa9b0c16..430aeb741897 100644
--- a/lib/matplotlib/legend.py
+++ b/lib/matplotlib/legend.py
@@ -1350,17 +1350,17 @@ def _in_handles(h, l):
             if type(f_h) != type(h):
                 continue
             try:
-                if f_h.get_color() != h.get_color():
+                if (f_h.get_color() != h.get_color()).any():
                     continue
             except AttributeError:
                 pass
             try:
-                if f_h.get_facecolor() != h.get_facecolor():
+                if (f_h.get_facecolor() != h.get_facecolor()).any():
                     continue
             except AttributeError:
                 pass
             try:
-                if f_h.get_edgecolor() != h.get_edgecolor():
+                if (f_h.get_edgecolor() != h.get_edgecolor()).any():
                     continue
             except AttributeError:
                 pass

From 58a221d9ba4ccf41ed44b80d7502e17bd1a25597 Mon Sep 17 00:00:00 2001
From: David Stansby <dstansby@gmail.com>
Date: Sun, 17 Dec 2017 12:18:56 +0000
Subject: [PATCH 2/3] Fix legend color handling

---
 lib/matplotlib/legend.py | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/lib/matplotlib/legend.py b/lib/matplotlib/legend.py
index 430aeb741897..555e8f1ccdf0 100644
--- a/lib/matplotlib/legend.py
+++ b/lib/matplotlib/legend.py
@@ -37,6 +37,7 @@
 from matplotlib import docstring
 from matplotlib.artist import Artist, allow_rasterization
 from matplotlib.cbook import silent_list, is_hashable
+import matplotlib.colors as colors
 from matplotlib.font_manager import FontProperties
 from matplotlib.lines import Line2D
 from matplotlib.patches import Patch, Rectangle, Shadow, FancyBboxPatch
@@ -1339,7 +1340,7 @@ def _get_legend_handles_labels(axs, legend_handler_map=None):
     labels = []
 
     def _in_handles(h, l):
-         # Method to check if we already have a given handle and label.
+        # Method to check if we already have a given handle and label.
         # Consider two handles to be the same if they share a label,
         # color, facecolor, and edgecolor.
 
@@ -1350,17 +1351,20 @@ def _in_handles(h, l):
             if type(f_h) != type(h):
                 continue
             try:
-                if (f_h.get_color() != h.get_color()).any():
+                if (colors.to_rgba(f_h.get_color()) !=
+                        colors.to_rgba(h.get_color())):
                     continue
             except AttributeError:
                 pass
             try:
-                if (f_h.get_facecolor() != h.get_facecolor()).any():
+                if (colors.to_rgba(f_h.get_facecolor()) !=
+                        colors.to_rgba(h.get_facecolor())):
                     continue
             except AttributeError:
                 pass
             try:
-                if (f_h.get_edgecolor() != h.get_edgecolor()).any():
+                if (colors.to_rgba(f_h.get_edgecolor()) !=
+                        colors.to_rgba(h.get_edgecolor())):
                     continue
             except AttributeError:
                 pass
@@ -1369,9 +1373,9 @@ def _in_handles(h, l):
 
     for handle in _get_legend_handles(axs, legend_handler_map):
         label = handle.get_label()
-        if (label
-                and not label.startswith('_')
-                and not _in_handles(handle, label)):
+        if (label and
+                not label.startswith('_') and
+                not _in_handles(handle, label)):
             handles.append(handle)
             labels.append(label)
     return handles, labels

From df2e51af44c668f396d218455f1c831dd9fa74f5 Mon Sep 17 00:00:00 2001
From: David Stansby <dstansby@gmail.com>
Date: Sun, 17 Dec 2017 15:54:48 +0000
Subject: [PATCH 3/3] Make comparison work with arrays

---
 lib/matplotlib/legend.py | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/lib/matplotlib/legend.py b/lib/matplotlib/legend.py
index 555e8f1ccdf0..80674554010f 100644
--- a/lib/matplotlib/legend.py
+++ b/lib/matplotlib/legend.py
@@ -1351,20 +1351,20 @@ def _in_handles(h, l):
             if type(f_h) != type(h):
                 continue
             try:
-                if (colors.to_rgba(f_h.get_color()) !=
-                        colors.to_rgba(h.get_color())):
+                if (colors.to_rgba_array(f_h.get_color()) !=
+                        colors.to_rgba_array(h.get_color())).any():
                     continue
             except AttributeError:
                 pass
             try:
-                if (colors.to_rgba(f_h.get_facecolor()) !=
-                        colors.to_rgba(h.get_facecolor())):
+                if (colors.to_rgba_array(f_h.get_facecolor()) !=
+                        colors.to_rgba_array(h.get_facecolor())).any():
                     continue
             except AttributeError:
                 pass
             try:
-                if (colors.to_rgba(f_h.get_edgecolor()) !=
-                        colors.to_rgba(h.get_edgecolor())):
+                if (colors.to_rgba_array(f_h.get_edgecolor()) !=
+                        colors.to_rgba_array(h.get_edgecolor())).any():
                     continue
             except AttributeError:
                 pass