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Backport PR #31587 on branch v3.11.x (FIX: scatter with ls="" crashes on PDF savefig) #31734

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Merged
tacaswell merged 1 commit into from
May 22, 2026
+12 −1
Merged

Backport PR #31587 on branch v3.11.x (FIX: scatter with ls="" crashes on PDF savefig) #31734

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2 changes: 1 addition & 1 deletion lib/matplotlib/lines.py
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Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,7 @@ def _get_dash_pattern(style):
if isinstance(style, str):
style = ls_mapper.get(style, style)
# un-dashed styles
if style in ['solid', 'None']:
if style in ['solid', 'None', 'none', '', ' ']:
offset = 0
dashes = None
# dashed styles
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11 changes: 11 additions & 0 deletions lib/matplotlib/tests/test_collections.py
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Expand Up @@ -704,6 +704,17 @@ def test_set_wrong_linestyle():
c.set_linestyle('fuzzy')


@pytest.mark.parametrize('ls', ['', ' ', 'none'])
def test_scatter_empty_linestyle_pdf(ls):
# Regression test: '', ' ', and 'none' are documented "draw nothing"
# linestyle aliases but were not recognized by _get_dash_pattern, causing
# savefig to PDF to crash with "zero-size array to reduction operation maximum".
plt.switch_backend('pdf')
fig, ax = plt.subplots()
ax.scatter([0, 1], [0, 1], ls=ls)
fig.savefig(io.BytesIO())


@mpl.style.context('default')
def test_capstyle():
col = mcollections.PathCollection([])
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