From 214999a2e47ec3a175ce78ce2f42ed1575f21675 Mon Sep 17 00:00:00 2001
From: hannah <story645@gmail.com>
Date: Mon, 19 May 2025 15:32:16 -0400
Subject: [PATCH] Backport PR #30079: FIX: cast legend handles to list

---
 lib/matplotlib/legend.py            |  1 +
 lib/matplotlib/tests/test_legend.py | 12 ++++++++++++
 2 files changed, 13 insertions(+)

diff --git a/lib/matplotlib/legend.py b/lib/matplotlib/legend.py
index 0c2dfc19705c..4d8238c307ef 100644
--- a/lib/matplotlib/legend.py
+++ b/lib/matplotlib/legend.py
@@ -459,6 +459,7 @@ def __init__(
             labels = [*reversed(labels)]
             handles = [*reversed(handles)]
 
+        handles = list(handles)
         if len(handles) < 2:
             ncols = 1
         self._ncols = ncols if ncols != 1 else ncol
diff --git a/lib/matplotlib/tests/test_legend.py b/lib/matplotlib/tests/test_legend.py
index 5e69044866db..eb3bfca7c293 100644
--- a/lib/matplotlib/tests/test_legend.py
+++ b/lib/matplotlib/tests/test_legend.py
@@ -42,6 +42,18 @@ def test_legend_ordereddict():
               loc='center left', bbox_to_anchor=(1, .5))
 
 
+def test_legend_generator():
+    # smoketest that generator inputs work
+    fig, ax = plt.subplots()
+    ax.plot([0, 1])
+    ax.plot([0, 2])
+
+    handles = (line for line in ax.get_lines())
+    labels = (label for label in ['spam', 'eggs'])
+
+    ax.legend(handles, labels, loc='upper left')
+
+
 @image_comparison(['legend_auto1.png'], remove_text=True)
 def test_legend_auto1():
     """Test automatic legend placement"""