Do not add default matplotlib font, but rely on the default LaTeX font.

oscargus · oscargus · commit 742371845b55 · 2022-01-05T17:30:08.000+01:00
diff --git a/examples/userdemo/pgf_fonts.py b/examples/userdemo/pgf_fonts.py
@@ -5,7 +5,9 @@
 
 """
 
+import matplotlib as mpl
 import matplotlib.pyplot as plt
+mpl.use("pgf")
 plt.rcParams.update({
     "font.family": "serif",
     # Use LaTeX default serif font.
diff --git a/lib/matplotlib/backends/backend_pgf.py b/lib/matplotlib/backends/backend_pgf.py
@@ -48,12 +48,16 @@ def get_fontspec():
         families = ["serif", "sans\\-serif", "monospace"]
         commands = ["setmainfont", "setsansfont", "setmonofont"]
         for family, command in zip(families, commands):
-            # 1) Forward slashes also work on Windows, so don't mess with
-            # backslashes.  2) The dirname needs to include a separator.
-            path = pathlib.Path(fm.findfont(family))
-            latex_fontspec.append(r"\%s{%s}[Path=\detokenize{%s}]" % (
-                command, path.name, path.parent.as_posix() + "/"))
-
+            try:
+                # 1) Forward slashes also work on Windows, so don't mess with
+                # backslashes.  2) The dirname needs to include a separator.
+                path = pathlib.Path(fm.findfont(family,
+                                                fallback_to_default=False))
+                latex_fontspec.append(r"\%s{%s}[Path=\detokenize{%s}]" % (
+                    command, path.name, path.parent.as_posix() + "/"))
+            except ValueError:
+                # Use default LaTeX font instead
+                pass
     return "\n".join(latex_fontspec)
 
 
