Let TeX handle newlines itself.

anntzer · anntzer · commit d62b6e2cb82c · 2022-01-30T12:39:06.000+01:00
Note that it may be worth passing the baselineskip
(`Text.get_linespacing()`) as argument to texmanager, but that'll wait
for a bigger refactor... for now, let's stick to the old default of
1.25.
diff --git a/lib/matplotlib/texmanager.py b/lib/matplotlib/texmanager.py
@@ -217,7 +217,7 @@ def make_tex(self, tex, fontsize):
 %% when using psfrag which gets confused by it.
 \fontsize{%(fontsize)f}{%(baselineskip)f}%%
 \ifdefined\psfrag\else\hbox{}\fi%%
-{%(fontcmd)s %(tex)s}\special{matplotlibbaselinemarker}
+{\obeylines%(fontcmd)s %(tex)s}\special{matplotlibbaselinemarker}
 \end{document}
 """
         Path(texfile).write_text(tex_template % {
diff --git a/lib/matplotlib/text.py b/lib/matplotlib/text.py
@@ -295,7 +295,8 @@ def _get_layout(self, renderer):
         of a rotated text when necessary.
         """
         thisx, thisy = 0.0, 0.0
-        lines = self.get_text().split("\n")  # Ensures lines is not empty.
+        text = self.get_text()
+        lines = [text] if self.get_usetex() else text.split("\n")  # Not empty.
 
         ws = []
         hs = []
