Restrict postscript title to ascii. (#12890)

anntzer · timhoffm · commit 18a8a94bef00 · 2018-11-26T22:22:05.000+01:00
The postscript standard makes no reference to the interpretation of
non-ascii entities, so assuming an encoding is incorrect.
diff --git a/lib/matplotlib/backends/backend_ps.py b/lib/matplotlib/backends/backend_ps.py
@@ -970,7 +970,7 @@ def _print_figure(
         isEPSF = format == 'eps'
         if isinstance(outfile, (str, getattr(os, "PathLike", ()),)):
             outfile = title = getattr(os, "fspath", lambda obj: obj)(outfile)
-            title = title.encode("latin-1", "replace").decode("latin-1")
+            title = title.encode("ascii", "replace").decode("ascii")
             passed_in_file_object = False
         elif is_writable_file_like(outfile):
             title = None
