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In usetex, remove vertical space inserted by TeX after displaymath. #24011

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In usetex, remove vertical space inserted by TeX after displaymath. #24011

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8 changes: 8 additions & 0 deletions lib/matplotlib/tests/test_usetex.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@
from matplotlib.testing import _has_tex_package
from matplotlib.testing.decorators import check_figures_equal, image_comparison
from matplotlib.testing._markers import needs_usetex
from matplotlib.texmanager import TexManager
import matplotlib.pyplot as plt


Expand Down Expand Up @@ -138,3 +139,10 @@ def test_missing_psfont(fmt, monkeypatch):
ax.text(0.5, 0.5, 'hello')
with TemporaryFile() as tmpfile, pytest.raises(ValueError):
fig.savefig(tmpfile, format=fmt)


def test_ends_with_displaymath():
# Check that we do not include extra vspace after displaymath.
text = r'\begin{eqnarray*} foo \\ bar \end{eqnarray*}'
w, h, d = TexManager().get_text_width_height_descent(text, 12)
assert d == 0 # no extra descent on the last line.
2 changes: 1 addition & 1 deletion lib/matplotlib/texmanager.py
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Expand Up @@ -231,7 +231,7 @@ def _get_tex_source(cls, tex, fontsize):
rf"\fontsize{{{fontsize}}}{{{baselineskip}}}%",
r"\ifdefined\psfrag\else\hbox{}\fi%",
rf"{{\obeylines{fontcmd} {tex}}}%",
r"\special{matplotlibbaselinemarker}%",
r"\vskip-\lastskip\special{matplotlibbaselinemarker}%",
r"\end{document}",
])

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