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Backport PR #21758 on branch v3.5.x (FIX: Make sure a renderer gets attached to figure after draw) #21777

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Merged
merged 1 commit into from
Nov 28, 2021
Merged

Backport PR #21758 on branch v3.5.x (FIX: Make sure a renderer gets attached to figure after draw) #21777

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2 changes: 1 addition & 1 deletion lib/matplotlib/backends/backend_macosx.py
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Original file line number Diff line number Diff line change
Expand Up @@ -43,7 +43,7 @@ def _draw(self):

def draw(self):
# docstring inherited
self.draw_idle()
self._draw()
self.flush_events()

# draw_idle is provided by _macosx.FigureCanvas
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20 changes: 20 additions & 0 deletions lib/matplotlib/tests/test_backend_macosx.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,20 @@
import pytest

import matplotlib.pyplot as plt


pytest.importorskip("matplotlib.backends.backend_macosx",
reason="These are mac only tests")


@pytest.mark.backend('macosx')
def test_cached_renderer():
# Make sure that figures have an associated renderer after
# a fig.canvas.draw() call
fig = plt.figure(1)
fig.canvas.draw()
assert fig._cachedRenderer is not None

fig = plt.figure(2)
fig.draw_without_rendering()
assert fig._cachedRenderer is not None