Only decode path strings if it is not already str (in other words, on Python 2 leave str as str instead of converting to unicode).

embray · embray · commit 6fda2ab9898d · 2017-12-19T13:58:13.000Z
diff --git a/lib/matplotlib/__init__.py b/lib/matplotlib/__init__.py
@@ -710,7 +710,7 @@ def _get_cachedir():
 
 
 def _decode_filesystem_path(path):
-    if isinstance(path, bytes):
+    if not isinstance(path, str):
         return path.decode(sys.getfilesystemencoding())
     else:
         return path
