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Backport PR #28397 (FIX: stale root Figure when adding/updating subfigures) #28479

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Merged
merged 1 commit into from
Jun 27, 2024
Merged

Backport PR #28397 (FIX: stale root Figure when adding/updating subfigures) #28479

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2 changes: 2 additions & 0 deletions lib/matplotlib/figure.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1633,6 +1633,8 @@ def add_subfigure(self, subplotspec, **kwargs):
sf = SubFigure(self, subplotspec, **kwargs)
self.subfigs += [sf]
sf._remove_method = self.subfigs.remove
sf.stale_callback = _stale_figure_callback
self.stale = True
return sf

def sca(self, a):
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24 changes: 24 additions & 0 deletions lib/matplotlib/tests/test_figure.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1733,3 +1733,27 @@ def test_warn_colorbar_mismatch():
subfig3_1.colorbar(im3_2) # should not warn
with pytest.warns(UserWarning, match="different Figure"):
subfig3_1.colorbar(im4_1)


def test_subfigure_stale_propagation():
fig = plt.figure()

fig.draw_without_rendering()
assert not fig.stale

sfig1 = fig.subfigures()
assert fig.stale

fig.draw_without_rendering()
assert not fig.stale
assert not sfig1.stale

sfig2 = sfig1.subfigures()
assert fig.stale

fig.draw_without_rendering()
assert not fig.stale
assert not sfig2.stale

sfig2.stale = True
assert fig.stale
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