diff --git a/lib/matplotlib/legend.py b/lib/matplotlib/legend.py
index a8c3781a70f2..6fe76fabd8e6 100644
--- a/lib/matplotlib/legend.py
+++ b/lib/matplotlib/legend.py
@@ -976,9 +976,11 @@ def get_title(self):
'Return the `.Text` instance for the legend title.'
return self._legend_title_box._text
- def get_window_extent(self, *args, **kwargs):
+ def get_window_extent(self, renderer=None):
'Return extent of the legend.'
- return self._legend_box.get_window_extent(*args, **kwargs)
+ if renderer is None:
+ renderer = self.figure._cachedRenderer
+ return self._legend_box.get_window_extent(renderer=renderer)
def get_tightbbox(self, renderer):
"""
diff --git a/lib/matplotlib/tests/test_legend.py b/lib/matplotlib/tests/test_legend.py
index 4f92f044fd6b..d508d6f41fc2 100644
--- a/lib/matplotlib/tests/test_legend.py
+++ b/lib/matplotlib/tests/test_legend.py
@@ -510,6 +510,17 @@ def test_legend_proper_window_extent():
assert pytest.approx(x01*2, 0.1) == x02
+def test_window_extent_cached_renderer():
+ fig, ax = plt.subplots(dpi=100)
+ ax.plot(range(10), label='Aardvark')
+ leg = ax.legend()
+ leg2 = fig.legend()
+ fig.canvas.draw()
+ # check that get_window_extent will use the cached renderer
+ leg.get_window_extent()
+ leg2.get_window_extent()
+
+
def test_legend_title_fontsize():
# test the title_fontsize kwarg
fig, ax = plt.subplots()
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