alternative fix, that should pass tests

djdt · djdt · commit 82796e8f5b60 · 2019-07-19T09:49:33.000+10:00
diff --git a/lib/matplotlib/transforms.py b/lib/matplotlib/transforms.py
@@ -1838,6 +1838,9 @@ def get_matrix(self):
 
         .
         """
+        if self._invalid:
+            self._inverted = None
+            self._invalid = 0
         return self._mtx
 
     def set_matrix(self, mtx):
